F

ROUGH WORK

1. Moment of a force about a point is

Same as Couple


Same as Torque


Magnitude of Force multiplied by perpendicular distance from the point of Force


Same as moment of couple


2. In case of cocurrent coplanar forces the condition for equilibrium is

S H S V S M 0 S H S V 0


S H S M 0 S V S M 0


3. The resultant of forces P -2i 3j and Q 3i 4j will lie in which quadrant

First Second


Third Fourth


4. A body is acted upon by a number of coplanar, non-concurrent forces, it may

rotate about itself without moving


be completely at rest


moving in one direction and rotating about itself


None of the above


5. Two skew shafts can be connected by gears.

straight spur spiral bevel


cross helical straight bevel


6. The mass moment of inertia of rectangular plate of mass M and sides a and b about an axis perpendicular to plate through it is
M 2 2 Ma2Mb2
b
6 412
M 2 bd3
2

12 12
7. Two forces are at an angle of 120º. If the bigger force is 40 N and the resultant to smaller
Force ratio is
3 then the smaller force will be

20 N 40 N


80 Kg None of the above


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8. From gravitational law the weight W of an 80 kg in spacecraft travelling in a circular orbit 280 km above earth is

728 N 804·8 N


646 N None of above


9. A 50 kg homogeneous smooth sphere rests on the 30º incline at A and bears against the smooth vertical wall B. The contact force at A and B are

FA 566 FB 283 N FA 283 FB 566 N


FA 566 FB 180 N FA 180 FB 283 N


10. A uniform of length 3·6 m between support has a mass of 50 kg per meter of length. If a mass of 300 kg is placed at 2·4 m from left end support the reactions at supports A and B are

Ay 2840 By 1850 N Ay 1864 By 2840 N


Ay 1850 By 2840 N None of above


11. The tension in the cable supporting a lift

is less when moving upward is less when moving downward


is more when moving downward is more when moving upwards


12. A body of mass m moving with constant velocity hits another body of the same mass at rest and sticks to it. The velocity combined masses after collision is
V
V
4
V

2 V 2
13. The inherent property of a body which offers resistance to change is

weight mass


momentum inertia


14. A block of mass m attached to a spring of stiffness K is pushed to the right side-away from support with velocity v when the spring is unstretched. The maximum extension of spring x is
K· . b
m

.

2m K
K K · .
· . d
m m
15. A truck of 6 ton mass is moving on a level terrain at a speed of 80 kmph, when brakes are applied. The braking force is of constant magnitude of 4 N/ton. The distance travelled before coming to rest is

69 m 71·62 m


61·72 m 72·61 m


16. The pressure angle between a pair of mating gears is

Common tangent at p.c.d. and arc of contact


Common tangent at p.c.d. and common tangent on base circle


Ratio of arc of contact path of contact


None of above


17. The dimensions of power are

ML2T2 MLT3


ML2T3 ML2T-3


18. Which of the following is a scalar quantity

energy momentum


torque impulse


19. A ball is dropped from a height of 9 m on a horizontal floor. If it rebounds to a height of 4 m after striking the floor, the coefficient of restitution between the ball the floor is
1 2

2 . 43 p
3 4

2 3
20. In a Simple Harmonic Motion the time period T is given by
2p
2p.
.
2p


.2
21. When a body slides down on inclined surface the acceleration of the body is given by

g g sin .


g cos . g tan .


22. The link or element must be

rigid body resistant body


both above None of the above


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23. When two elements have surface contact when relative motion takes place and surface of one element slides over the surface of other, the pair formed is known as

higher pair lower pair


force-closed pair turning pair


24. A kinematic chain requires minimum of

2 links and 2 turning pair 3 links and 3 turning pair


4 links and 4 turning pair None of above


25. The time period of a compound pendulum is equal to
2

gh
K2 h
2p
2p
2 2 gh
K h
2 2
1 Kh 1gh(C)

2p gh 2p K2 h2
where K is radius of gyration about an axes through C.G. and h is the distance of its C.G. from the axis of suspension.
26. A harmonic motion is expressed as
x
1·25

.

in
.. .

15pt x
.. .

3

where x is in meters. The frequency of motion would be

1·25 Hz 15 Hz


15 p Hz 7·5 Hz


27. A vibrating mass under the condition of resonance has phase angle (i.e. angle between displacement vector and disturbing force vector) as
p

0º


p


4
28. A circular disc of moment of inertia J is attached to lower end of elastic vertical shaft which is fixed at other end. If the mass of shaft is small and K is the torsional stiffness of shaft, the natural frequency of torsional vibration is
K
.n
g
J
J

.n .n
K K
29. A simply supported beam of length L between supports is loaded at the center of beam with a mass M. The natural frequency in Hz would be 1
48EI

48EI

2p
2p ML3 ML3
1 16EI 1 48EI

2p ML3 p ML3
30. In a Hartnell governor if the stiffness of spring is increased, the governor will

Become more sensitive Becomes less sensitive


Starts Hunting Become isochronous


31. The number nodes in a shaft carrying two rotors at two ends will be

Zero One


Two None of above


32. Modulus of rigidity is given by
stress compressive stress

strain compressive strain
shear stress
None
shear strain
PE A l
33. A tensile load acts on a length l and area of cross-section A. The change in length would be
P

l AE
P l A l


AE PE
34. A cantilever beam of length carries a uniformly distributed load over the whole length. The bending moment diagram will be

Parabola with maximum ordinate at the centre


Parabola with maximum ordinate at cantilever end


Triangle with maximum ordinate at free end


Triangle with maximum ordinate at cantilever end


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35. A simply supported beam carries a uniformly distributed load of W Newton unit length over the whole length The shear force at the centre is
2
w l w l

28
w l

Zero
4
36. A solid circular shaft of diameter D carries an axial load W. If the same load is applied
D
axially to a hollow cylinder shaft of inner diameter as the ratio of stress in solid shaft
2
to that of hollow shaft would be
1 1

24
43


3 4
d3y
37. The expression EI 3 at section of member represent
dx

Shearing force Rate of loading


Bending moment Slope


38. When a shaft is subjected to torsion, the relation between maximum shear stress fs, modulus of rigidity G of the shaft and the angle of twist . is given by
G . R


f L
s

where L is length of shaft and R is the radius of shaft.
39. In metal cutting operation continuous chips are produced while machining

brittle material ductile material


hard material soft material


40. In metal cutting operation chips are formed due to

Linear deformation Shear deformation


Linear translation None


41. The average cutting speed for machining cast iron by a high speed steel tool is

10 m/min 22 m/min


30 m/min 300 m/min


42. The relationship between tool life and cutting speed in m/min is given as
VnT C VTn C
Vn Tn
C 0
TV
where C is constant and is an exponent depending upon tool and workpiece.
43. Tool Signature

is a natural method of tool identification


is a numerical method of tool identification


represents tool life


none of the above


44. Operation of cutting holes in sheet by a press is known as

drilling shearing


extrusion none of above


45. Cold chisel are made by

rolling forging


piercing drawing


46. Forging of steel is done at a temperature of

400ºC 800ºC


1000ºC 1300ºC


47. Seam welding is used for metal sheets having thickness in the range of

0·025 to 3 mm 3 to 6 mm


6 to 10 mm more than 10 mm


48. Which of the following defect in castings is caused by the molten metal

Scab Swell


Shrinkage Blow Holes


49. In wirecut EDM the electrode is

a thin wire a thin sheet


a copper bar a tungsten plate


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50. Which of the following is a single point cutting tool

Milling cutter Hacksaw blade


Grinding wheel Parting tool


51. Which type of gear can be manufactured by extrusion process

Bevel Gears Harring bon Gear


Helical Gear Spur Gear


52. Internal Gears and splines used in automobile industry are manufactured by

Casting Milling


Broaching Gear shaping


53. Gears made by sand casting are used in

Automobile Machine tools


Diesel locomotives Concrete mixers


54. The process which takes place below recrystallisation temperature, is known as

hot working process cold working process


casting process none of above


55. Slag inclusion in casting is a

Surface defect Internal defect


Superficial defect None


56. Time study is done by means of

Stop watch Time study sheet


Planning chart Both and above


57. Time standards developed by time study can be used for

plan layout budgetary control


equipment selection wages incentives


58. Graphic representation of the separable steps of each pertinent body member of the individual is known as

Bar chart SIMO chart


Gantt chart None


59. Layout suitable for automobile manufacturing unit is

process layout product layout


combination layout all above


60. Objective of work measurement is to

plan and schedule the production


formulate proper incentive scheme


estimate the selling price and delivery date


all above


61. Break even analysis consist of

fixed expense variable cost


sales revenue all above


62. Direct cost of a project constitutes

cost of material wages of labour


both and none


63. A continuous production of products of same design on a line of machines arranged according to the required sequence of operation is known as

flow production mass production


line production continuous production


64. The unit cost in case of batch production as compared to jobbing production is

High Low


Same None


65. Jobs going behind schedule are conveniently shown in

bar chart Gantt chart


travel chart pi chart


66. Mathematical technique used for finding the best use of limited resources of concern in an optimum manner, is known as

queuing theory Linear programming


value analysis game theory


67. Queuing theory is used for

job-shop scheduling inventory problems


traffic congestion studies all above


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68. For a closed system the difference between heat added to the system and work done by the system is equal to change in

temperature internal energy


enthalpy entropy


69. Specific heat is the amount of heat required to raise the temperature

by unit degree of a substance by unit degree of unit mass


by 102 degree of unit mass none


70. When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is

Zeroth law of thermodynamics First law of thermodynamics


Second law of thermodynamics None of the above


71. According to kinetic theory of gases, at absolute zero

specific heat of molecules reduces to zero


kinetic energy of molecules reduces to zero


volume of gas reduces to zero


pressure of gas reduces to zero


72. Equal volume of all gases at same temperature and pressure contain equal number of molecules. This is according to

Charle's law Avogadro law


Joule's law Gay Lussac law


73. In isothermal expansion, work done by a gas depends on

atomicity of gas only expansion ratio only


adiabatic index both and above


74. When a perfect gas is expanded through an aperture of minute dimensions, the process is

isothermal adiabatic


isentropic throttling


75. If v1 is the volume at beginning and v2 is volume at the end of expansion, then the expansion ratio is given by
v v
1 2

v v
2 1
v v
1 2

v
1
76. The efficiency of the Carnot cycle can be increased by

increasing the highest temperature


decreasing the lowest temperature


decreasing the highest temperature


both and above


77. Compression ratio of a petrol engine is

3 to 6 5 to 8


15 to 20 20 to 30


78. The efficiency of a Rankine cycle
increases with decreasing temperature of heat rejection VDv1+ v2 decreases with decreasing temperature of heat rejection v.1 v2 decreases with increasing temperature of heat rejection
none
79. The Reynolds number for pipe flow is given by
VD µ



d
VD . VD






µ µ
80. The mercury water manometer indicates a gauge difference of 400 mm. The difference of pressure measured in meters of water is

0·4 0·8


10·8 5·44


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81. Steady flow occurs when

The pressure does not change along the flow


The velocity does not change


There is no obstruction on the path of flow


Conditions do not change with time


82. The continuity equation in ideal fluid flow

States that the net rate of inflow into any small volume must be zero


States that energy is constant every where in the fluid


States that energy remains constant along stream line


Applies to irrotational flow


83. Which of the following is laminar flow

Rise of water in plants through roots


Movement of blood in the arteries of a human body


Flow of oil in measuring instruments


All above


84. The dimensions of dynamic viscosity are

ML-1 T-2 MLT-2


ML-1 T-1 ML-1 T


V2 P
85. The Bernoulli's equation Z constant represent total energy per unit 2g .

mass volume


weight specific weight


86. The loss of energy in commercial pipe fitting is denoted by loss coefficient which is expressed by
2 2
V V
hL KL hL KL
2g g
2
1V

h None
L K2g
L
87. The boundary layer exists due to

Surface Tension Fluid density


Fluid viscosity All above


88. The laminar boundary layer changes from Laminar to turbulent when plate Reynolds number approaches a value in the range

2 × 106 to 5 × 106 2 × 108 to 8 × 108


3 × 105 to 6 × 105 None of above


89. The discharge for a laminar flow through a pipe of diameter 40 mm having centre-line velocity of 1·5 m/s in m3/s is
3p







59
90. In a Navier-Stoke equation the force considered is

viscous force pressure force


gravity force all above


91. Transfer of heat from one body to another takes place
when there is temperature difference between the bodiesdT3
p
K
both bodies must be in contact2500
dx
5000
10000

both bodies must be solid


all above


92. According to Fourier's law, amount of heat flow Q through the body in unit time is equal to



K


dx
dT
dT

KA dx
dx
KA where K is coefficient of thermal conductivity, A is surface area of heat flow,
dt
dT
is temperature gradient and dx is body thickness
dx
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93. Thermal conductivity of air at room temperature in KCal/m-hr-ºC is approximately

0·051 0·09


0·10 0·51


Q
A
94. The ratio of heat flow from two walls of same thickness having thermal conductivity
Q
B
2 K for the same temperature difference will be
KAB
11

24

95. Pipes are isolated so that

they may not break under pressure


there is minimum corrosion


they can withstand higher fluid pressure


heat loss from the surface is minimized


96. Steady state heat transfer occurs when

the flow of heat is negligible


the flow of heat is uniform


the flow of heat is independent of time


the flow of heat is uniformly decreasing


97. Three metal walls of same cross-sectional area having thermal conductivity in the ratio
1 2 4 transfer heat at the rate of 15000 kcal/hr. For same thickness of wall, the temperature drop will be in the ratio
1 2 4 4 2 1
11 11
1
24 42
98. The value of Prandtl number for air is of the order of

1000 67


9·7 0·7


99. In heat exchanger design one transfer unit means

condition when the change in temperature of one stream numerically equals the average driving force


The section of heat exchanger which will cause temperature drop of one degree centigrade


The equivelent length of tubes in case the heat exchange was for a temperature difference of 1ºC


One fluid exchanging with another fluid of the same chemical composition


100. Which of the following power plant will give least running cost of the production of electric power

Steam power plant Diesel engine power plant


Gas turbine power plant Nuclear power plant


101. The carbon percentage in diesel oil is nearly

86% 74%


66% 52%


102. Which plant has least pollution problem

Steam power plant Hydro-electric power plant


Gas turbine power plant Nuclear power plant


103. The generating station is to supply four regions of loads with peak demands of 10 MW, 15 MW, 20 MW and 30 MW. If the diversity factor is 1·5 the maximum demand on the
station is 70 MW 50 MW 60 MW 45 MW
104. Steam enters the steam nozzle at low pressure and low velocity high pressure and low velocity high pressure and high velocity low pressure and high velocity
105. The expansion of steam in nozzle follows Rankine Cycle Joule Cycle Carnot Cycle Stirling Cycle

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106. Ratio of useful heat drop to the isentropic heat drop is known as

boiler efficiency nozzle efficiency


condenser efficiency vacuum efficiency


107. The isentropic expansion of initially dry saturated steam through the nozzle may approximately be given by

PV constant PV1·2 constant


PV1·135 constant PV1·3 constant


108. During idling a petrol engine requires

lean mixture rich mixture


chemically correct mixture none of above


109. In spark ignition engine the possibility of knocking can be reduced by

increasing compression ratio


decreasing compression ratio


increasing the coolant temperature


advancing the spark timing


110. Power plant having least running cost of production of electric power is

Gas turbine power plant Hydroelectric power plant


Nuclear power plant Steam power plant


111. In S.I. unit one tonne of refrigeration is equal to

110 kJ/min 210 kJ/min


50 kJ/min none


112. A refrigerant should have low

boiling point specific heat of liquid


specific volume of vapour all above


113. Freon-12 has operating pressure about

2 kg/cm2 8 kg/cm2


15 kg/cm2 30 kg/cm2


114. The domestic refrigerator has C.O.P.

more than 1 less than 1


equal to 1 none


115. In a psychometric chart sensible heating or cooling is represented by

a vertical line a horizontal line


a curved line an inclined line


116. During dehumidification process specific humidity

increases decreases


remains same none


117. Lowest C.O.P. is of

vapour compression cycle using dry compression


vapour compression cycle using wet compression


vapour compression cycle with superheated vapour


vapour absorption cycle


118. Mass of water vapour present in 1 m3 of dry air is known as

relative humidity absolute humidity


percentage humidity humidity ratio


119. A storage tank which receives refrigerant from evaporator and prevent from flowing into compressor is known as

accumulator agitator


condenser balancer


120. C.O.P. of a vapour absorption system can be increased by using

vapour compressor heat exchanger


both above none


ROUGH WORK