Exam Details
Subject | automobile engineering | |
Paper | ||
Exam / Course | mains | |
Department | ||
Organization | maharashtra public service commission | |
Position | assistant motor vehicle inspector | |
Exam Date | 2005 | |
City, State | maharashtra, |
Question Paper
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CODE:AYT
100191
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201. Petrol Engine works on cycle.
Natural Air
Otto Camot
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3 P.T.O.
AYT
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4
AYT
AUTOMOBILE ENGINEERING
1. The property by which a body regains its original shape after removal of force is defined as
plasticity elasticity
ductility malleability
2. Bending moment is maximum on a section of a beam where shear force is
maXImum mInImUm
equal changing sign
3. The ratio of change in volume and original volume of the body is called as
tensile strain compressive strain
shear strain volumetric strain
4. A shaft of diameter subject to a bending moment and a twisting moment at a section. The maximum shear stress is given by the equation
16 16.
"[max 1t d3 T 2 "[max d3 T2
16
"[max 1
5. In case of column
one end is hinged and other end fixed
one end is fixed and other end free
both ends are hinged
both the ends are fixed rigidly
6. Slenderness ratio of a column may be defined as the ratio of its length to the
radius of column
minimum radius of gyration
maximum radius of gyration
none of the above
5 P.T.O.
IQI AYT
7. What will be the thickness of metal required for a cast iron main 800 mm in diameter for water at a pressure head of 100 m if the maximum permissible tensile stress is 20 MN/m2 and weight ofwater is 10 kN/m3.
15mm 20mm
25 mm 30mm
8. In case of circular section, the section modulus is given by
7t d4
64
9. If the two axes about which the product of inertia is found, are such that the product of inertia becomes zero, the two axes are called as
centroidal axes
principal axes
major and minor axes
none ofthe above
10. Which one of the basic equation of simple bending is correct
where I Moment ofInertia E Modulus of Elasticity F Stress at any fibre at a distance of y from neutral axis M Bending moment R Radius of curvature
MFE MFR
y
IR I Y E
FME F Y R
y
I R IME
6
AYT
11. The shear angle for two dimensional cutting operation is given by an equation
where r cutting ratio
a rake angle
shear angle
rcosa rcos a
tan . tan .
1 sm a 1-r sm a 1-rsin a 1 r sin a
tan tan
rcos a rcos a
12. The standard point angle of drill used for drilling a wood and fibre is
116°toll8° 130° to 140°
60° 125°
13. Which one of the following process is preferred for improving the surface finish of a job?
Milling Turning
Super finishing Drilling
14. Which one of the following is a type of brass?
Babbit metal .Gun metal
Monel metal Muntz metal
15. In which process the principle of electrolysis is used to remove metal from workpiece?
EDM (E1ectrodischarge Machining)
ECM (Electrochemical Machining)
EDG (Electrodischarge Grinding)
USM (Ultrasonic Machining)
16. Hot short phenomenon occurs in steel because of excess amount of
manganese sulphur
silicon phosphorus
AYT
17. For holding irregular shaped work and carrying out eccentric turning suitable. is most
four jaw chuck three jaw chuck
collet chuck face plate
18. Recognize the type of defect in casting caused due to shift of the individual parts of a casting with respect to each other.
Blow holes Mismatch
Swell Warpage
19. Extrusion is a type of operation.
Hot Working and Cold Working Welding
Casting Fitting
20. For holding work piece, which is already drilled or bored, is used on lathe.
collet chuck face plate
angle plate mandrel
21. In lathe, tumbler gear mechanism is used to control motion of
tool carriage job
tool post tail stock
22. Which type machine? of thread IS generally used for split nut of lead screw of screw cutting
Square Vee
Butress ACME
23. A planer differs from shaper in one important aspect that, in planer,
the work is fixed while tool reciprocates
the work reciprocates while tool is fixed
the work and tool, both move
the work and tool, both do not move
8
AYT
24. The process of removing metal by an elongated tool having a number of successive teeth of increasing size, which cut in a fixed path is known as,
reaming boaring
broaching honing
25. The property by virtue of which sand mould is capable of withstanding high temperature of the molten metal without fusing is known as
porosity adhesiveness
cohesiveness refractoriness
26. threading is generally used for gas, water or steam pipe joints.
BSW BSE
BSP None of these
27. Tool Steel has following elements.
Tungsten, Chromium, Vanadium
Chromium -Nickel
Tungsten, Chromium, Lead
None of these
28. For marking round shaped work piece be used.
Vee block Angle plate
Try square None of these
29. __are used for withdrawing pattern from the mould.
Riddles Draw spikes
Vent wire Slicks
30. Included angle of the centre for heavy work in lathe is
60°
none of these
AYT
31. Which one of the following is the best example of higher Kinematic Pair? Universal joint Shaft rotating in a bearing Nut turning on a screw Cam and follower
32. Which one of the following relationship holds good to express angle of friction and coefficient of friction
tan Il sin Il
cos Il
33. The ratio ofpitch diameter to the number of teeth, in a gear drive is termed as
circular pitch gear ratio
module none of the above
34. A load of 15 kN is raised by means of a screw jack. The mean diameter of the square threaded screw is 42 mm and the pitch is 10 mm. A force of 120 N is applied at the end of a lever to raise the load. Is the screw self locking?
Yes
No
Insufficient data to predict the result
None of the above
35. Assertion Spiral cams find its use in computers. Reason Spiral cams have two types of surfaces, convex and concave.
Both and are true and is the correct explanation for A
is true and is not the correct reason for
is false and is true
Both and are false statements
36. Which one of the follower is widely used and has a cylindrical roller free to rotate about a pin joint
Knife-edge follower Roller follower
Mushroom follower All the above
AYT
37. Which of the following circle is imaginary circle in study of gears?
Pitch circle Addendum circle
Dedendum circle All ofthem
38. Which of the following statement is correct?
The force of friction does not depend upon area of contact of two surfaces
The magnitude of limiting friction bears a constant ratio to the normal reaction between two surfaces
The force of friction depend upon area of contact of two surfaces
Both and
39. Dynamically unbalanced masses in rotating machines cause
vibration noise
40. In a plate cam mechanism, with reciprocating roller follower, the follower has constant acceleration in case of
cycloidaI motion S.H.M.
parabolic motion none of the above
41. A constant discharge passing through a conical pipe is an example of
steady uniform flow
steady non-uniform flow
unsteady uniform flow
unsteady non-uniform flow
42. Viscosity has the dimensions
where F is force, L is length and T is time
FL-2 T FL-1 1 1
FL12 FL2 T
lQJ AYT
43. The centre of buoyancy of a submerged body
coincides with the centre of gravity of the body.
is always below the centre of gravity of the body.
coincides with the centroid of the displaced volume of the fluid.
is always above the centroid of the displaced volume of the fluid.
44. The type of pump similar to propeller turbine is
lobe pump jet pump
injector pump axial flow pump
45. An impulse turbine
requires draft tube
is most suited for low head application
operates by initial complete conversion to kinetic energy
is not exposed to atmosphere
46. Hydraulic intensifier is a device used for
storing energy of fluid in the form of pressure energy
increasing pressure intensity of fluid
transmitting power from one shaft to other
none of the above
47. Hydraulic Ram is a pump which works On
the principle of water hammer
the principle of reciprocating action
the principle of centrifugal action
none of the above
AIT
48. Principle of Hydraulic accumulator is similar to the principle of
electrical transformer electrical battery
electrical generator electrical motor
49. A vertical circular cylinder is filled with water and then rotated about its vertical axis at a constant speed such that half the liquid spills out from the open top. At that instant, pressure at the centre of bottom should be
atmospheric pressure
sub-atmospheric pressure
one fourth of original value
more than atmospheric pressure
50. The fluids which have linear relationship between the magnitude of shear stress and the resulting rate of deformation are called
Ideal fluids
Non-Newtonian fluids
Newtonian fluids
Compressible fluids
51. Which of the following does not relate to a spark ignition engine?
Ignition coil Spark plug
Distributor Fuel injector
52. The ideal cycle on which steam engine works is
Camot cycle Rankine cycle
Otto cycle Joule cycle
53. The isentropic process on Mollier diagram is represented by
horizontal line vertical line
inclined line curved line
AYT
54. The dryness fraction ofsteam is equal to where m is mass of dry steam and mf mass of water in suspension.
g
mr/ mf)
g g g
mg/ mf mr/ mg
55. The locus of saturated liquid line and saturated vapour line meets at
boiling point ice point
triple point critical point
56. The effect of under cooling the refrigerant is to
reduce the refrigerating effect
increase the super heat of vapour
reduce the C.O.P. of the cycle
increase the C.O.P. of the cycle
57. Which one of the following conditions is the most suitable condition for comfort air conditioning?
25°C DBT and 100% R.H.
20°C DBT and 80% R.H.
22°C DBT and 60% R.H.
28°C DBT and 40% R.H.
58. Which chemical is liberated during geothermal power generation?
Sulphur Oxygen
Carbondioxide Nitrogen
AYT lQl
59. Assertion Steam expands in nozzles of impulse steam turbine. Reason Pressure of steam is converted into kinetic energy of steam in the nozzles.
Both and are true
Only is true
Only is true
Both and are not true
60. During cut-off governing of a steam engme, which one of the following parameter changes?
Speed
Steam pressure
Volume of steam supplied per stroke
Pressure and volume of steam supplied
61. Which calorific value of a fuel should be considered for calculation of thermal efficiency of a power plant?
Lower calorific value
Higher calorific value
Gross heating value
None of the above
62. A refrigerant machine working on reversed Carnot cycle consumes 3 kW for producing refrigerating effect of 500 kJ/min, for maintaining region at -40 DC, the higher temperature of the cycle will be
317K 44K
44 DC 233 K
AYT
63. Consider the following statements
Efforts are made to harness non conventional energy sources for power generation.
The conventional energy sources will be exhausted soon.
Now select the answer from the following alternatives.
Both and are true, but is not the correct reason for
is true, but is false
is true, but is false
Both and are true and is the correct reason for
64. Match List-I with List-II using the correct code given below: List-I List-II A Solar Energy I Ocean waves B Tidal Energy II Steam from earth C Geothermal Energy III Atomic fission D Gobar gas plant N Flat plate collector
V Anaerobic digestion ABCD
I II III N
II III IV V
N I II V
V I II III
65. Assertion The volumetric efficiency of Reciprocating Compressor (with clearance) is always less than 100%.
Reason The air present in the clearance volume will expand before the intake conditions are reached and it occupies some volume of cylinder.
Both and are true and is not the correct explanation for
Both and are true and is true reason for
is true, but is false
Both and are false
AYT IQI
66. The equation of work (with clearance volume) for a reciprocating compressor is given by the equation
n
where Polytropic law PV c
Va Effective swept volume
PI Suction pressure
P2 Final compressor pressure
n PI Jn-I
Va
n 1 Jn-I
PI Va n-1
P V
n-l I aP
1
PV
n-l Ia P
2
67. Isothermal compression for high speed compressor is achieved by the method
water jacketing inter-cooling
external fins all the above
68. Which one of the following air compressors is generally used in the gas turbines?
Axial flow rotary compressors
Radial blowers
Sliding vane compressors
Screw compressors
69. The efficiency of vane type air compressor as compared to roots air compressor for the same pressure ratio is
more less
same may be more or less
70. In Reciprocating air compressor the method of controlling the quantity of air delivered is done by
throttle control blow-off control
clearance control all the above
71. The work input to air compressor is minimum ifthe compression law followed is
pyl.35=C Isothermal PY C
Isentropic py r C py1.2 C
72. In centrifugal air compressor the pressure developed depends on
impeller tip velocity inlet temperature
compression Index all the above
73. The clearance volume in Reciprocating air compressor is provided to
reduce the work done I kg of air delivered
increase the volumetric efficiency of compressor
accommodate valves in the head ofthe compressor
create turbulence in the air to be delivered
74. What should be the intermediate pressure in two stage compression for minimum work of compression? Pa Suction pressure
Pi Intermediate pressure
pd =Delivery pressure
18
AYT
75. Which of the following efficiency is highly sensitive to a clearance volume of reciprocating air compressor?
Mechanical efficiency Isothermal efficiency
Adiabatic efficiency Volumetric efficiency
76. If the domestic refrigerator is kept in an insulated room, with its door open
the temperature of the room shall decrease after sometime
the temperature of the room shall increase after sometime
the temperature of the room shall Femain unaffected
nothing can be predicted about the temperature of the room
77. Air refrigeration system operates on
reversed Camot cycle reversed Brayton cycle
reversed Otto cycle reversed Stirling cycle
78. The statement that energy can neither be created nor be destroyed but can only be converted from one form to another is known as
Avogadro's hypothesis Gay-Lussac's law
Second Law ofthermodynamics First Law of thermodynamics
79. Match List-I with List-II and select the correct code.
List-I List-II
A Heavy water I Diesel Engine
B Rankine cycle II Gas Turbine
C Fuel pump III Thermal Power Plant
D Air compressor IV Nuclear Reactor
A B C D
III I II IV
II IV III I
I III II IV
IV III I II
19 P.T.O.
AYT
80. Select a false statement for Spark Ignition engine.
It is based on Otto cycle
Requires an ignition system with spark plug in the combustion chamber
Compression ratio 6 to 10.5
Low self ignition temperature of fuel is desirable
81. The thermal efficiency of the ideal diesel cycle is given by equation where p Cut off ratio
R Compression ratio 1
1 (pr
Rr-1
_1
none of the above
11-1-Rr-I
82. In an ideal Otto cycle the air standard efficiency is 56.5%. If the heat added during the constant volume process is lOOO kJ/kg, determine the work done.
1000 kJ/kg 1500 kJ/kg
565 kJ/kg None of the above
83. The duration of the ignition lag in an engine depends on the factors like
chemical nature of fuel mixture ratio
electrode gap all the above
84. Select the most appropriate sentence applicable to knocking phenomena of the S.I. engine
In S.1. engine, the detonation occurs near the end of combustion.
In S.I. engine, the detonation occurs near the begining of combustion.
In S.1. engine, the detonation is of a heterogeneous mixture causing very low rate of pressure rIse.
None of the above
AYT g
85. is a device which atomises the fuel and mixes it with air, and is the most important part of the induction system in an engine.
Spark plug Exhaust manifold
Carburettor Silencer
86. Which one of the following device is needed for carburettor used in aircraft application?
Altitude mixture correction device
Automatic de-icing unit to avoid formation of ice in the choke tube
Both and
None of the above
87. Which one of the following method for determination of engine friction is only applicable for diesel engines and also the gross fuel consumption is plotted against brake power and it is extended backwards to zero fuel consumption?
Morse test Motoring method
Deceleration method William's line method
88. In a diesel engine
fuel injection pump is used
fuel injection pump and carburettor is used
fuel injector is used
neither fuel injection pump nor injector is used
alone is true alone is true
and both are true all are true
89. Subcooling is a process of cooling the refrigerant at constant pressure, 111 a vapour compression plant
after compression before throttling
before compression after evaporation
90. Which of the following is a fossil fuel?
Coal Wood
Natural Uranium Hydrogen
21 P.T.O.
[iJ AYT
91. The two stroke cycle engine has port in the
cylinder walls pistons
piston rings cylinder head
92. In a diesel engine fuel and air mixture is ignited by the help of
a spark plug a glow plug
an injector temperature of compressed air
93. On many engines, the valve timing can be checked by means of marking on the
engine fly wheel valve guide
vibration damper valve cover
94. The purpose of chilled passage in the crank shafts is to
lubricate the main bearings
lubricate the connecting rod bearings
reduce the manufacturing cost
none of the above
95. Multiple jet compensation is a provision for
overcoming difficulties at different speeds in petrol engines
multipoint fuel injection in petrol engines
advanced electronic fuel injection system on petrol engines
efficient operation of super chargers at high altitude
96. The contact breaker points gap can be adjusted by
stroboscope tachometer
ignition tester feeler gauge
97. The radiator core is generally made up of
stainless steel nichrome
brass white metal
•
AYT
98. Cylinder wear is measured with
vernIer micrometer
dial gauge bore dial gauge
99. During the power stroke in a four stroke engine, the inlet valve and exhaust valves are
closed and opened respectively
both closed
opened and closed respectively
one open and other closed
100. The part that tends to keep the valve closed is called the
valve guide valve retainer
valve spring valve lifter
101. The pump part that rotates and causes water circulation between the radiator and the engine is called the
fan by-pass
thermostat impeller
102. During high speed operation when the throttle is wide open, the fuel supplied to the engine is discharged through the
low-speed port
idle port
main nozzle
both low speed and idle port
103. The pressure in the vicinity of main jet ofa carburettor remains
above atmospheric pressure
equal to atmospheric pressure
much below atmospheric pressure
very high pressure
1QI AYT
104. The amount of heat energy equivalent lost in overcoming engine friction is
30% 20%
15%
105. Thermal efficiency of a two stroke cycle engine is four stroke cycle engine
less than greater than
equal to greater than or equal to
106. The firing order of an I.C. engine depends upon
design of crankshaft no. of cylinders
arrangement of cylinders all of the above
107. Throttle valve is used in carburettor for
controlling the air admitted to venturi
controlling the air admitted and oil admitted to engine
controlling the air-petrol mixture admitted to engine
controlling the mixture of air and fuel in the mixing chamber
108. Commonly used antifreeze solution in automobiles is
Glycerine Liquid ammonia
Ammonium chloride Carbon disulphide
109. What is Vapour Lock?
Phenomenon of irregular supply of petrol due to vapour formation at higher temp.
Phenomenon of cut off diesel supply
Phenomenon of overflow of petrol
Phenomenon of icing on venturi
24
AYT
110. Engine cranks do no start during winter because of
battery discharge weak spark
worn out engine lean mixture
and are correct and are correct
and are correct and are correct
. 111. When the rear wheels are jacked up and gears are in neutral, turning one rear wheel of the rear drive in anticlockwise direction, will cause the other to
turn in clockwise direction turn in anticlockwise direction
turn in either direction remain stationary
112. Torque converter can replace
gear box
clutch
fluid fly wheel
alone is correct alone is correct
alone is correct and are correct
113. Flywheels are used in
bicycles
starting motor
gear boxes
alone is correct alone is correct
and are correct all are correct
114. Independent suspension on all four wheels is used in
Maruti 800 car A.C. sports car
Morgon plus 8 car Fiat 1100 car
115. The brake pipes in hydraulic brake system are made of
rubber steel
pvc aluminium
25 P.T.O.
AYT
116. Trafficators are lights used for
heavy traffic
light traffic
reversing the car in traffic
indicating the direction in which it turns
117. Aluminium cylinder blocks requires
no liners aluminium liners
brass liners cast iron liners
118. The values of wheel lock angle and the steering lock angle respectively are about
46° and 43° 20° and 23°
23° and 20° 43° and 46°
119. Which of the following is correct statement?
The car bonnet should have a longer length
The texture of a hard top roof is different from its body work
Side impact can be minimized by 2 2 seating layout
A reclining seat and side shift aisle seat are almost the same
120. Match List-I with List-II and choose the correct answer from the codes given below the lists.
List-I List-II
A. Tachometer 1. Bimetal electric type
B. Odometer 2. Decibel
C. Fuel gauge 3. 90 kmph
D. Pressure hom 4. 6000 rpm
5. 3750 km
Code:
A B C0
(1) 45 12
(2) 54 21
(3) 34 2 1
2 13
AYT
121. The spark plug generally is to be replaced when the vehicle has run about
5000 km 10000 km
15000 km 20000 km
122. The recommended oil change schedule for cars is
15000 km one year duration
9 months duration 10000 km
[Note: Assume in each option other recommended schedule has not yet attained.]
123. The number of points at which the engine-clutch-gear box unit is supported on the chassis frame is
one two
three four
124. The most effective section of frame against bending is
rectangular bar section
round bar section
round hollow section
square hollow section
125. Why bendix drive is provided for a starter?
To restart the drive pinion from flywheel after the engine starts
To start the motor
To drive t1ywheel
To operate solenoid
126. The type of commercial vehicle which connects tractor to the trailer by a fifth wheel coupling is called
6x5 8x5
rigid articulated
27 P.T.O.
AYT
127. A clutch is usually designed to transmit maximum torque which is
equal to the maximum engine torque
80 percent ofthe maximum torque
150 percent of the maximum torque
none of the above
128.
The oil flow in the torus of a torque converter is of
129.
Coefficient of friction between the correctly inflated tyre of a jeep and the icy surface of Srinagar in Jammu and Kashmir is about
0.01 0.55
111.3 0.10
130.
For the best braking perfonnance the braking effort on the front wheels and the rear wheels are in the following proportion:
50% 60%
40% 55%
131.
Capacity of storage battery to convert chemical energy into electrical energy is tested by
hydrometer test high discharge test
specific gravity test arc test
132.
Engine emits white smoke due to
spiral and vortex type
steady, unifonn and laminar types
vortex, rotary and spiral types
none of the above
excessive lean mixture
excessive rich mixture
excessive oil with fuel
worn out piston rings
28
AYT
133. Car pulls to one side while braking due to frame misaligned unequal load in car loose rear springs brake grabs
134. During battery charge, the electrolyte becomes
colder thinner
lighter heavier
135. Exhaust valve temperature is about
35°C 100 °C
500°C 1000°C
136. Humming noise in the differential is due to improper tooth contact between
drive pinion and ring gear
axle and side gear
pinion and gears
shafts and bearings
137. Which type of rear axle is generally used in heavy commercial vehicles?
Semi floating axle
Fully floating axle
Three quarter floating axle
Plain axle
138. An instrument called hydrometer is used for
measuring specific gravity of acid
measuring viscosity of an oil
measuring temp of water
measuring charging of battery
AYT
139. The probable cause for hard steering could be
low tyre pressure bent wheel spindle
tie rod end tight any of the above
140. The tightening torque required for cylinder head bolts in motor cycles generally lie between
5 to 10 N-m 10 to 20 N-m
25to30 N-m 40to60N-m
141. Most of the mopeds in India have capacity of
100 CC 50 CC
150 CC 120 CC
142. In which of the following documents, the details of the vehicle tax are recorded?
R.C. Book T.c. Book
Driving licence None ofthe above
143. __permit is provided for seasonal business.
Goods carriage Contract carriage
National Temporary
144. What is the term used for the person to whom goods are sent and to whom they are intended to be delivered?
Consigner Consignee
Operator None ofthe above
145. Which data is mainly recorded in the "log book" ofthe vehicle?
Performance of the vehicle
Running time for a trip
Loading, unloading of vehicle
None of the above
30
AYT
146. Which are the three colour lights used in traffic signal?
Red, Green and Black
Blue, Green and Red
Blue, Pink and Green
Red, Green and Amber
147. Vehicles exempted from paying motor vehicles' tax are
fire brigade agricultural vehicles
taxis
state transport buses
two wheelers
148. Consignment note gives the details regarding
goods to be transported
number of trips made
purchase of the vehicle
tax paid
149. Which organisation conducts the training programmes to the administrative and supervisory staff of MSRTC
C.I.R.T. TELCO
V.R.D.E. A.R.A.I.
150. Gross vehicle weight means
weight of the load carried by the vehicle only
total weight of the vehicle and load
weight of the vehicle chassis only
none of the above
CODE:AYT
100191
BOOKLET NO.
li'1qffi1 Cfll
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tm ifl<hl'ili1 t I fcR:r«rr <iiIMq+i
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Natural Air
Otto Camot
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3 P.T.O.
AYT
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4
AYT
AUTOMOBILE ENGINEERING
1. The property by which a body regains its original shape after removal of force is defined as
plasticity elasticity
ductility malleability
2. Bending moment is maximum on a section of a beam where shear force is
maXImum mInImUm
equal changing sign
3. The ratio of change in volume and original volume of the body is called as
tensile strain compressive strain
shear strain volumetric strain
4. A shaft of diameter subject to a bending moment and a twisting moment at a section. The maximum shear stress is given by the equation
16 16.
"[max 1t d3 T 2 "[max d3 T2
16
"[max 1
5. In case of column
one end is hinged and other end fixed
one end is fixed and other end free
both ends are hinged
both the ends are fixed rigidly
6. Slenderness ratio of a column may be defined as the ratio of its length to the
radius of column
minimum radius of gyration
maximum radius of gyration
none of the above
5 P.T.O.
IQI AYT
7. What will be the thickness of metal required for a cast iron main 800 mm in diameter for water at a pressure head of 100 m if the maximum permissible tensile stress is 20 MN/m2 and weight ofwater is 10 kN/m3.
15mm 20mm
25 mm 30mm
8. In case of circular section, the section modulus is given by
7t d4
64
9. If the two axes about which the product of inertia is found, are such that the product of inertia becomes zero, the two axes are called as
centroidal axes
principal axes
major and minor axes
none ofthe above
10. Which one of the basic equation of simple bending is correct
where I Moment ofInertia E Modulus of Elasticity F Stress at any fibre at a distance of y from neutral axis M Bending moment R Radius of curvature
MFE MFR
y
IR I Y E
FME F Y R
y
I R IME
6
AYT
11. The shear angle for two dimensional cutting operation is given by an equation
where r cutting ratio
a rake angle
shear angle
rcosa rcos a
tan . tan .
1 sm a 1-r sm a 1-rsin a 1 r sin a
tan tan
rcos a rcos a
12. The standard point angle of drill used for drilling a wood and fibre is
116°toll8° 130° to 140°
60° 125°
13. Which one of the following process is preferred for improving the surface finish of a job?
Milling Turning
Super finishing Drilling
14. Which one of the following is a type of brass?
Babbit metal .Gun metal
Monel metal Muntz metal
15. In which process the principle of electrolysis is used to remove metal from workpiece?
EDM (E1ectrodischarge Machining)
ECM (Electrochemical Machining)
EDG (Electrodischarge Grinding)
USM (Ultrasonic Machining)
16. Hot short phenomenon occurs in steel because of excess amount of
manganese sulphur
silicon phosphorus
AYT
17. For holding irregular shaped work and carrying out eccentric turning suitable. is most
four jaw chuck three jaw chuck
collet chuck face plate
18. Recognize the type of defect in casting caused due to shift of the individual parts of a casting with respect to each other.
Blow holes Mismatch
Swell Warpage
19. Extrusion is a type of operation.
Hot Working and Cold Working Welding
Casting Fitting
20. For holding work piece, which is already drilled or bored, is used on lathe.
collet chuck face plate
angle plate mandrel
21. In lathe, tumbler gear mechanism is used to control motion of
tool carriage job
tool post tail stock
22. Which type machine? of thread IS generally used for split nut of lead screw of screw cutting
Square Vee
Butress ACME
23. A planer differs from shaper in one important aspect that, in planer,
the work is fixed while tool reciprocates
the work reciprocates while tool is fixed
the work and tool, both move
the work and tool, both do not move
8
AYT
24. The process of removing metal by an elongated tool having a number of successive teeth of increasing size, which cut in a fixed path is known as,
reaming boaring
broaching honing
25. The property by virtue of which sand mould is capable of withstanding high temperature of the molten metal without fusing is known as
porosity adhesiveness
cohesiveness refractoriness
26. threading is generally used for gas, water or steam pipe joints.
BSW BSE
BSP None of these
27. Tool Steel has following elements.
Tungsten, Chromium, Vanadium
Chromium -Nickel
Tungsten, Chromium, Lead
None of these
28. For marking round shaped work piece be used.
Vee block Angle plate
Try square None of these
29. __are used for withdrawing pattern from the mould.
Riddles Draw spikes
Vent wire Slicks
30. Included angle of the centre for heavy work in lathe is
60°
none of these
AYT
31. Which one of the following is the best example of higher Kinematic Pair? Universal joint Shaft rotating in a bearing Nut turning on a screw Cam and follower
32. Which one of the following relationship holds good to express angle of friction and coefficient of friction
tan Il sin Il
cos Il
33. The ratio ofpitch diameter to the number of teeth, in a gear drive is termed as
circular pitch gear ratio
module none of the above
34. A load of 15 kN is raised by means of a screw jack. The mean diameter of the square threaded screw is 42 mm and the pitch is 10 mm. A force of 120 N is applied at the end of a lever to raise the load. Is the screw self locking?
Yes
No
Insufficient data to predict the result
None of the above
35. Assertion Spiral cams find its use in computers. Reason Spiral cams have two types of surfaces, convex and concave.
Both and are true and is the correct explanation for A
is true and is not the correct reason for
is false and is true
Both and are false statements
36. Which one of the follower is widely used and has a cylindrical roller free to rotate about a pin joint
Knife-edge follower Roller follower
Mushroom follower All the above
AYT
37. Which of the following circle is imaginary circle in study of gears?
Pitch circle Addendum circle
Dedendum circle All ofthem
38. Which of the following statement is correct?
The force of friction does not depend upon area of contact of two surfaces
The magnitude of limiting friction bears a constant ratio to the normal reaction between two surfaces
The force of friction depend upon area of contact of two surfaces
Both and
39. Dynamically unbalanced masses in rotating machines cause
vibration noise
40. In a plate cam mechanism, with reciprocating roller follower, the follower has constant acceleration in case of
cycloidaI motion S.H.M.
parabolic motion none of the above
41. A constant discharge passing through a conical pipe is an example of
steady uniform flow
steady non-uniform flow
unsteady uniform flow
unsteady non-uniform flow
42. Viscosity has the dimensions
where F is force, L is length and T is time
FL-2 T FL-1 1 1
FL12 FL2 T
lQJ AYT
43. The centre of buoyancy of a submerged body
coincides with the centre of gravity of the body.
is always below the centre of gravity of the body.
coincides with the centroid of the displaced volume of the fluid.
is always above the centroid of the displaced volume of the fluid.
44. The type of pump similar to propeller turbine is
lobe pump jet pump
injector pump axial flow pump
45. An impulse turbine
requires draft tube
is most suited for low head application
operates by initial complete conversion to kinetic energy
is not exposed to atmosphere
46. Hydraulic intensifier is a device used for
storing energy of fluid in the form of pressure energy
increasing pressure intensity of fluid
transmitting power from one shaft to other
none of the above
47. Hydraulic Ram is a pump which works On
the principle of water hammer
the principle of reciprocating action
the principle of centrifugal action
none of the above
AIT
48. Principle of Hydraulic accumulator is similar to the principle of
electrical transformer electrical battery
electrical generator electrical motor
49. A vertical circular cylinder is filled with water and then rotated about its vertical axis at a constant speed such that half the liquid spills out from the open top. At that instant, pressure at the centre of bottom should be
atmospheric pressure
sub-atmospheric pressure
one fourth of original value
more than atmospheric pressure
50. The fluids which have linear relationship between the magnitude of shear stress and the resulting rate of deformation are called
Ideal fluids
Non-Newtonian fluids
Newtonian fluids
Compressible fluids
51. Which of the following does not relate to a spark ignition engine?
Ignition coil Spark plug
Distributor Fuel injector
52. The ideal cycle on which steam engine works is
Camot cycle Rankine cycle
Otto cycle Joule cycle
53. The isentropic process on Mollier diagram is represented by
horizontal line vertical line
inclined line curved line
AYT
54. The dryness fraction ofsteam is equal to where m is mass of dry steam and mf mass of water in suspension.
g
mr/ mf)
g g g
mg/ mf mr/ mg
55. The locus of saturated liquid line and saturated vapour line meets at
boiling point ice point
triple point critical point
56. The effect of under cooling the refrigerant is to
reduce the refrigerating effect
increase the super heat of vapour
reduce the C.O.P. of the cycle
increase the C.O.P. of the cycle
57. Which one of the following conditions is the most suitable condition for comfort air conditioning?
25°C DBT and 100% R.H.
20°C DBT and 80% R.H.
22°C DBT and 60% R.H.
28°C DBT and 40% R.H.
58. Which chemical is liberated during geothermal power generation?
Sulphur Oxygen
Carbondioxide Nitrogen
AYT lQl
59. Assertion Steam expands in nozzles of impulse steam turbine. Reason Pressure of steam is converted into kinetic energy of steam in the nozzles.
Both and are true
Only is true
Only is true
Both and are not true
60. During cut-off governing of a steam engme, which one of the following parameter changes?
Speed
Steam pressure
Volume of steam supplied per stroke
Pressure and volume of steam supplied
61. Which calorific value of a fuel should be considered for calculation of thermal efficiency of a power plant?
Lower calorific value
Higher calorific value
Gross heating value
None of the above
62. A refrigerant machine working on reversed Carnot cycle consumes 3 kW for producing refrigerating effect of 500 kJ/min, for maintaining region at -40 DC, the higher temperature of the cycle will be
317K 44K
44 DC 233 K
AYT
63. Consider the following statements
Efforts are made to harness non conventional energy sources for power generation.
The conventional energy sources will be exhausted soon.
Now select the answer from the following alternatives.
Both and are true, but is not the correct reason for
is true, but is false
is true, but is false
Both and are true and is the correct reason for
64. Match List-I with List-II using the correct code given below: List-I List-II A Solar Energy I Ocean waves B Tidal Energy II Steam from earth C Geothermal Energy III Atomic fission D Gobar gas plant N Flat plate collector
V Anaerobic digestion ABCD
I II III N
II III IV V
N I II V
V I II III
65. Assertion The volumetric efficiency of Reciprocating Compressor (with clearance) is always less than 100%.
Reason The air present in the clearance volume will expand before the intake conditions are reached and it occupies some volume of cylinder.
Both and are true and is not the correct explanation for
Both and are true and is true reason for
is true, but is false
Both and are false
AYT IQI
66. The equation of work (with clearance volume) for a reciprocating compressor is given by the equation
n
where Polytropic law PV c
Va Effective swept volume
PI Suction pressure
P2 Final compressor pressure
n PI Jn-I
Va
n 1 Jn-I
PI Va n-1
P V
n-l I aP
1
PV
n-l Ia P
2
67. Isothermal compression for high speed compressor is achieved by the method
water jacketing inter-cooling
external fins all the above
68. Which one of the following air compressors is generally used in the gas turbines?
Axial flow rotary compressors
Radial blowers
Sliding vane compressors
Screw compressors
69. The efficiency of vane type air compressor as compared to roots air compressor for the same pressure ratio is
more less
same may be more or less
70. In Reciprocating air compressor the method of controlling the quantity of air delivered is done by
throttle control blow-off control
clearance control all the above
71. The work input to air compressor is minimum ifthe compression law followed is
pyl.35=C Isothermal PY C
Isentropic py r C py1.2 C
72. In centrifugal air compressor the pressure developed depends on
impeller tip velocity inlet temperature
compression Index all the above
73. The clearance volume in Reciprocating air compressor is provided to
reduce the work done I kg of air delivered
increase the volumetric efficiency of compressor
accommodate valves in the head ofthe compressor
create turbulence in the air to be delivered
74. What should be the intermediate pressure in two stage compression for minimum work of compression? Pa Suction pressure
Pi Intermediate pressure
pd =Delivery pressure
18
AYT
75. Which of the following efficiency is highly sensitive to a clearance volume of reciprocating air compressor?
Mechanical efficiency Isothermal efficiency
Adiabatic efficiency Volumetric efficiency
76. If the domestic refrigerator is kept in an insulated room, with its door open
the temperature of the room shall decrease after sometime
the temperature of the room shall increase after sometime
the temperature of the room shall Femain unaffected
nothing can be predicted about the temperature of the room
77. Air refrigeration system operates on
reversed Camot cycle reversed Brayton cycle
reversed Otto cycle reversed Stirling cycle
78. The statement that energy can neither be created nor be destroyed but can only be converted from one form to another is known as
Avogadro's hypothesis Gay-Lussac's law
Second Law ofthermodynamics First Law of thermodynamics
79. Match List-I with List-II and select the correct code.
List-I List-II
A Heavy water I Diesel Engine
B Rankine cycle II Gas Turbine
C Fuel pump III Thermal Power Plant
D Air compressor IV Nuclear Reactor
A B C D
III I II IV
II IV III I
I III II IV
IV III I II
19 P.T.O.
AYT
80. Select a false statement for Spark Ignition engine.
It is based on Otto cycle
Requires an ignition system with spark plug in the combustion chamber
Compression ratio 6 to 10.5
Low self ignition temperature of fuel is desirable
81. The thermal efficiency of the ideal diesel cycle is given by equation where p Cut off ratio
R Compression ratio 1
1 (pr
Rr-1
_1
none of the above
11-1-Rr-I
82. In an ideal Otto cycle the air standard efficiency is 56.5%. If the heat added during the constant volume process is lOOO kJ/kg, determine the work done.
1000 kJ/kg 1500 kJ/kg
565 kJ/kg None of the above
83. The duration of the ignition lag in an engine depends on the factors like
chemical nature of fuel mixture ratio
electrode gap all the above
84. Select the most appropriate sentence applicable to knocking phenomena of the S.I. engine
In S.1. engine, the detonation occurs near the end of combustion.
In S.I. engine, the detonation occurs near the begining of combustion.
In S.1. engine, the detonation is of a heterogeneous mixture causing very low rate of pressure rIse.
None of the above
AYT g
85. is a device which atomises the fuel and mixes it with air, and is the most important part of the induction system in an engine.
Spark plug Exhaust manifold
Carburettor Silencer
86. Which one of the following device is needed for carburettor used in aircraft application?
Altitude mixture correction device
Automatic de-icing unit to avoid formation of ice in the choke tube
Both and
None of the above
87. Which one of the following method for determination of engine friction is only applicable for diesel engines and also the gross fuel consumption is plotted against brake power and it is extended backwards to zero fuel consumption?
Morse test Motoring method
Deceleration method William's line method
88. In a diesel engine
fuel injection pump is used
fuel injection pump and carburettor is used
fuel injector is used
neither fuel injection pump nor injector is used
alone is true alone is true
and both are true all are true
89. Subcooling is a process of cooling the refrigerant at constant pressure, 111 a vapour compression plant
after compression before throttling
before compression after evaporation
90. Which of the following is a fossil fuel?
Coal Wood
Natural Uranium Hydrogen
21 P.T.O.
[iJ AYT
91. The two stroke cycle engine has port in the
cylinder walls pistons
piston rings cylinder head
92. In a diesel engine fuel and air mixture is ignited by the help of
a spark plug a glow plug
an injector temperature of compressed air
93. On many engines, the valve timing can be checked by means of marking on the
engine fly wheel valve guide
vibration damper valve cover
94. The purpose of chilled passage in the crank shafts is to
lubricate the main bearings
lubricate the connecting rod bearings
reduce the manufacturing cost
none of the above
95. Multiple jet compensation is a provision for
overcoming difficulties at different speeds in petrol engines
multipoint fuel injection in petrol engines
advanced electronic fuel injection system on petrol engines
efficient operation of super chargers at high altitude
96. The contact breaker points gap can be adjusted by
stroboscope tachometer
ignition tester feeler gauge
97. The radiator core is generally made up of
stainless steel nichrome
brass white metal
•
AYT
98. Cylinder wear is measured with
vernIer micrometer
dial gauge bore dial gauge
99. During the power stroke in a four stroke engine, the inlet valve and exhaust valves are
closed and opened respectively
both closed
opened and closed respectively
one open and other closed
100. The part that tends to keep the valve closed is called the
valve guide valve retainer
valve spring valve lifter
101. The pump part that rotates and causes water circulation between the radiator and the engine is called the
fan by-pass
thermostat impeller
102. During high speed operation when the throttle is wide open, the fuel supplied to the engine is discharged through the
low-speed port
idle port
main nozzle
both low speed and idle port
103. The pressure in the vicinity of main jet ofa carburettor remains
above atmospheric pressure
equal to atmospheric pressure
much below atmospheric pressure
very high pressure
1QI AYT
104. The amount of heat energy equivalent lost in overcoming engine friction is
30% 20%
15%
105. Thermal efficiency of a two stroke cycle engine is four stroke cycle engine
less than greater than
equal to greater than or equal to
106. The firing order of an I.C. engine depends upon
design of crankshaft no. of cylinders
arrangement of cylinders all of the above
107. Throttle valve is used in carburettor for
controlling the air admitted to venturi
controlling the air admitted and oil admitted to engine
controlling the air-petrol mixture admitted to engine
controlling the mixture of air and fuel in the mixing chamber
108. Commonly used antifreeze solution in automobiles is
Glycerine Liquid ammonia
Ammonium chloride Carbon disulphide
109. What is Vapour Lock?
Phenomenon of irregular supply of petrol due to vapour formation at higher temp.
Phenomenon of cut off diesel supply
Phenomenon of overflow of petrol
Phenomenon of icing on venturi
24
AYT
110. Engine cranks do no start during winter because of
battery discharge weak spark
worn out engine lean mixture
and are correct and are correct
and are correct and are correct
. 111. When the rear wheels are jacked up and gears are in neutral, turning one rear wheel of the rear drive in anticlockwise direction, will cause the other to
turn in clockwise direction turn in anticlockwise direction
turn in either direction remain stationary
112. Torque converter can replace
gear box
clutch
fluid fly wheel
alone is correct alone is correct
alone is correct and are correct
113. Flywheels are used in
bicycles
starting motor
gear boxes
alone is correct alone is correct
and are correct all are correct
114. Independent suspension on all four wheels is used in
Maruti 800 car A.C. sports car
Morgon plus 8 car Fiat 1100 car
115. The brake pipes in hydraulic brake system are made of
rubber steel
pvc aluminium
25 P.T.O.
AYT
116. Trafficators are lights used for
heavy traffic
light traffic
reversing the car in traffic
indicating the direction in which it turns
117. Aluminium cylinder blocks requires
no liners aluminium liners
brass liners cast iron liners
118. The values of wheel lock angle and the steering lock angle respectively are about
46° and 43° 20° and 23°
23° and 20° 43° and 46°
119. Which of the following is correct statement?
The car bonnet should have a longer length
The texture of a hard top roof is different from its body work
Side impact can be minimized by 2 2 seating layout
A reclining seat and side shift aisle seat are almost the same
120. Match List-I with List-II and choose the correct answer from the codes given below the lists.
List-I List-II
A. Tachometer 1. Bimetal electric type
B. Odometer 2. Decibel
C. Fuel gauge 3. 90 kmph
D. Pressure hom 4. 6000 rpm
5. 3750 km
Code:
A B C0
(1) 45 12
(2) 54 21
(3) 34 2 1
2 13
AYT
121. The spark plug generally is to be replaced when the vehicle has run about
5000 km 10000 km
15000 km 20000 km
122. The recommended oil change schedule for cars is
15000 km one year duration
9 months duration 10000 km
[Note: Assume in each option other recommended schedule has not yet attained.]
123. The number of points at which the engine-clutch-gear box unit is supported on the chassis frame is
one two
three four
124. The most effective section of frame against bending is
rectangular bar section
round bar section
round hollow section
square hollow section
125. Why bendix drive is provided for a starter?
To restart the drive pinion from flywheel after the engine starts
To start the motor
To drive t1ywheel
To operate solenoid
126. The type of commercial vehicle which connects tractor to the trailer by a fifth wheel coupling is called
6x5 8x5
rigid articulated
27 P.T.O.
AYT
127. A clutch is usually designed to transmit maximum torque which is
equal to the maximum engine torque
80 percent ofthe maximum torque
150 percent of the maximum torque
none of the above
128.
The oil flow in the torus of a torque converter is of
129.
Coefficient of friction between the correctly inflated tyre of a jeep and the icy surface of Srinagar in Jammu and Kashmir is about
0.01 0.55
111.3 0.10
130.
For the best braking perfonnance the braking effort on the front wheels and the rear wheels are in the following proportion:
50% 60%
40% 55%
131.
Capacity of storage battery to convert chemical energy into electrical energy is tested by
hydrometer test high discharge test
specific gravity test arc test
132.
Engine emits white smoke due to
spiral and vortex type
steady, unifonn and laminar types
vortex, rotary and spiral types
none of the above
excessive lean mixture
excessive rich mixture
excessive oil with fuel
worn out piston rings
28
AYT
133. Car pulls to one side while braking due to frame misaligned unequal load in car loose rear springs brake grabs
134. During battery charge, the electrolyte becomes
colder thinner
lighter heavier
135. Exhaust valve temperature is about
35°C 100 °C
500°C 1000°C
136. Humming noise in the differential is due to improper tooth contact between
drive pinion and ring gear
axle and side gear
pinion and gears
shafts and bearings
137. Which type of rear axle is generally used in heavy commercial vehicles?
Semi floating axle
Fully floating axle
Three quarter floating axle
Plain axle
138. An instrument called hydrometer is used for
measuring specific gravity of acid
measuring viscosity of an oil
measuring temp of water
measuring charging of battery
AYT
139. The probable cause for hard steering could be
low tyre pressure bent wheel spindle
tie rod end tight any of the above
140. The tightening torque required for cylinder head bolts in motor cycles generally lie between
5 to 10 N-m 10 to 20 N-m
25to30 N-m 40to60N-m
141. Most of the mopeds in India have capacity of
100 CC 50 CC
150 CC 120 CC
142. In which of the following documents, the details of the vehicle tax are recorded?
R.C. Book T.c. Book
Driving licence None ofthe above
143. __permit is provided for seasonal business.
Goods carriage Contract carriage
National Temporary
144. What is the term used for the person to whom goods are sent and to whom they are intended to be delivered?
Consigner Consignee
Operator None ofthe above
145. Which data is mainly recorded in the "log book" ofthe vehicle?
Performance of the vehicle
Running time for a trip
Loading, unloading of vehicle
None of the above
30
AYT
146. Which are the three colour lights used in traffic signal?
Red, Green and Black
Blue, Green and Red
Blue, Pink and Green
Red, Green and Amber
147. Vehicles exempted from paying motor vehicles' tax are
fire brigade agricultural vehicles
taxis
state transport buses
two wheelers
148. Consignment note gives the details regarding
goods to be transported
number of trips made
purchase of the vehicle
tax paid
149. Which organisation conducts the training programmes to the administrative and supervisory staff of MSRTC
C.I.R.T. TELCO
V.R.D.E. A.R.A.I.
150. Gross vehicle weight means
weight of the load carried by the vehicle only
total weight of the vehicle and load
weight of the vehicle chassis only
none of the above