Rajasthan Public Service Commission 2016
Paper 68AssttDrillingEngineer
Ques
In casting process, which of the following cross section is preferred for runner?
Square
Rectangular
Trapezoidal
Circular
Ques
0
0.413
0.99
1.567
Ques
With increase in torch angle,flame density:1)
Increases
Decreases
Remain constant
First increases then decreases

Ques
Cycle time of resistance welding consists of
Squeeze time, weld time, hold time on time
On time, weld time hold time off time
On time, weld time off time
Squeeze time, weld time, hold time off time
Ques
Go gauge is made for limit to inspect hole size .
Maximum material
Minimum material
Intermediate material
Optimum material
Ques
54 m/min
150 m/min
194 m/min
250 m/min
Ques

When the ordering cost is increased to 4 times,the Economic Order Quantity(EOQ) will be increased to
2 times
3 times
8 times
Remains same
Ques
The time taken to drill a hole through a 25 mm thick plate with the drill rotating at 300 rpm and moving at a feed rate of 0.25 mm/rev
10 sec
20 sec
60 sec
100 sec
Ques
The method of classification of items to be adopted for spare parts inventory is
ABC analysis
XYZ analysis
VED analysis
SDE analysis
Ques :10
In rolling process, sheet of 25 mm thickness is rolled to 20 mm thickness. Roll is of diameter 600 mm and it rotates at 100 rpm. The rod strip
contact length will be
5 mm
39 mm
78 mm
120 mm

Ques :11
Calculate the smallest punch diameter that can be designed for piercing sheet metal strip with the following data: [Crushing strength of the punch
material is 1500 Mpa. Thickness of the sheet is 2mm, factor of safety is and shear strength of the sheet material is 500 MPa]
2 mm
6 mm
8 mm
24 mm
Ques :12




Ques :13

13.334
15.334
15.442
15.542
Ques :14




Ques :15
In a transportation problem, there are four supply centers and five demand centers,The total quantity of supply available is greater than total
demand . The number of allocations without degeneracy during an iteration is
3

6
9
0
Ques :16
The length of the links of a 4bar
linkage with revolute pairs only are o and p units. Given that . Which of these links should be the
fixed one, for obtaining a "double crank" mechanism?
Link of length m
Link of length n
Link of length o
Link of length p
Ques :17
A slider crank mechanism with crank radius 60 mm is perpendicular to connecting rod having length 240 mm. The crank is rotating with uniform
angular speed of 10 rad/s, counter clockwise. For the given configuration, the speed of slider is
618
0.618
6.18
61.8
Ques :18

0 rpm
20 rpm
33.33 rpm
66.67 rpm
Ques :19
L
M
N
8

Ques :20
For a certain engine having an average speed of 20 rps, a flywheel approximated as a solid disc, is required for keeping the fluctuation of the speed
within about the average speed. The fluctuation of kinetic energy per cycle is found to be 2kJ. What is the least possible mass of the flywheel if
its diameter is not to exceed 1
40 kg
62 kg
51 kg
73 kg
Ques :21





Ques :22
The vibration machine is isolated from floor using springs. If the ratio of excitation frequency of vibration of machine to the natural frequency of
the isolation system is equal to 0.5, the transmissibility ratio of isolation is
1/2
3/4
4/3
2
Ques :23
40
50
60

100
Ques :24
In metals subjected to cold working, strain hardening effect is due to
Slip mechanism
Twinning mechanism
Dislocation mechanism
Fracture mechanism
Ques :25
A steel bar of 5 mm is heated from 15 °C to 40 °C and it is free to expand. The bar will induce
No stress
Shear Stress
Tensile Stress
Compressive stress
Ques :26
Euler's critical load for a column with both ends hinged is found as 40 kN. What would be the change in the critical load if both ends are fixed?
160 kN
200 kN
20 kN
50 kN
Ques :27


M+T

MT
Ques :28
The shapes of the bending moment diagram for a uniform cantilever beam carrying a uniformly distributed load over its length
A straight line
A hyperbola
An ellipse
A parabola
Ques :29
A steel bar of 40 mm x 40 mm square crosssection
is subjected to an axial compressive load of 200 kN. If the length of the bar is 2m and E 200
GPa, the elongation of the bar will be:
1.25 mm
2.70 mm
4.05 mm
5.40 mm
Ques :30

The shear stress on principal planes is
Maximum
Minimum
Zero
None of these
Ques :31




Ques :32
The flow of a liquid at constant rate in a conically tapered pipe is classified as
Steady, uniform flow
Steady, non uniform flow
Unsteady, uniform flow
Unsteady, non uniform flow
Ques :33
If coefficients of discharge of a venturimeter, orifice meter and nozzle are respectively then,





Ques :34
The intensity of turbulence refers to
average kinetic energy of turbulence per unit mass
root mean square value of turbulent velocity fluctuations
the Reynolds stresses
Ques :35
A 1000 m long pipe discharges 1 m³/sec of water with the head of 99 m at the inlet. The maximum power transmitted by pipe is (specific weight of
water 10
990 kW
660 kW
445 kW
None
Ques :36
An oil of kinematic viscosity 0.25 stokes flows through a pipe of diameter 10 cm. The flow is critical at the velocity of
7.2 m/sec
5.0 m/sec
0.5 m/sec
0.72 m/sec

Ques :37
A water jet with a velocity 20 m/sec is directed upwards at an angle of 45° to the horizontal. If air resistance is neglected, it will reach a maximum
elevation at a distance of from nozzle. The value of in meters
20.38
40.77
10.19
14.41
Ques :38
In a turbulent flow through a pipe the centre line velocity is 3.61 m/sec and the friction factor f 0.02, the mean velocity of flow in m/sec
4.80
3.00
2.21
0.96
Ques :39





Ques :40
A smooth pipe of diameter 200 mm carries water. The pressure in the pipe at section S1 (elevation=10m) is 50 kPa. At section S2 (elevation=12 m
the pressure is 20 kPa and velocity 2m/s. Density of water is 1000 kg/m³ and acceleration due to gravity is 9.81 m/s². Which of the following is true?
Flow is from S1 to S2 and head loss is 0.53 m
Flow is from S2 to S1 and head loss is 0.53 m
flow is from S1 to S2 and head loss is 1.06 m
flow is from S2 to S1 and head loss is 1.06 m
Ques :41
Regression method of forecasting is applicable mainly for
Causal models
Qualitative forecasting
Time series
models
Delphy method
Ques :42
Compressible and irrotational

Compressible and rotational
Incompressible and irrotational
Incompressible and rotational
Ques :43
Which of the following is not a turbo machine
Centrifugal pump
Kaplan Turbine
Reciprocating pump
Fans
Ques :44
An impulse turbine
Always operates submerged
Makes use of draft tube
Is most suited for low head installations
Operates by initial complete conversion of kinetic head
Ques :45
Windage is
Effect of runner speed on wind
Winding of electrical wire on motor
Friction between pelton wheel and atmoshpere
Cavitation
Ques :46

Which of the following is an objective of annealing
To relieve internal stress
To refine grain structures
To soften the metal
To improve machinability
Ques :47
The function of draft tube is
Recuperation of energy
To make it possible to establish the turbine above tail race
Both recuperation of energy and to make it possible to establish the turbine above tail race
None of these
Ques :48
A reaction turbine discharges 50 m³/sec of water under a head of 7.5 m with an overall efficiency of 80%. The H.P developed is
5000
300
4000
None of these
Ques :49
A large hydraulic turbine is to generate 300 kW at 100 rpm under a head of 40 m. For initial testing, a 1:4 scale model of the turbine operates
under a head of 10 m. The power generated by model (in kW) will be
2.34
4.68
9.38

18.75
Ques :50
Which of the following parameters are true when the cavitation parameter s i. The local pressure is reduced to vapour pressure ii. Cavitation
starts iii. Boiling of liquid starts iv. Cavitation stops
and
only and
only and
and
Ques :51
2.248
4.248
0.693
1.308

Ques :52
Selfenergizing
for clockwise rotation of the drum
Selfenergizing
for anticlockwise
rotation of the drum
Selfenergizing
for rotation in either direction of the drum
Not of the selfenergizing
type

Ques :53
Errors generally distributed in accordance with the Goussian distribution are
Controllable errors
Caliberation errors
Avoidable errors
Random errors
Ques :54
Ball bearing are made from:1)
Low carbon steel
Medium carbon steel
High speed steel
Chrome nickel steel
Ques :55
Instrument used to measure the flow through open canal:1)
Orifice plate
Venturi meter
Pitot tube
V notch method
Ques :56
The torque that can be transmitted safely by the spur gear tooth at zero pitch line velocity is known
Average torque
Maximum torque

Minimum torque
Stalling torque
Ques :57
67 N.mm
84 N.mm
114 N.mm
50 N.mm
Ques :58
Two plates are joined by a parallel fillet weld. The plate is subjected to a tensile load of 340 kN. The working stress in shear for weld material is 80
Mpa. The length of 15 mm weld received to resist load
400 mm length of weld adjusted on both sides
200 mm length of weld adjusted on both sides
400 mm length on each side
100 mm length of weld on each side
Ques :59
A solid copper ball of mass 500 grams, when quenched in a water bath at 30°C, cools from 530°C to 430°C in 10 seconds. What will be the
temperature of the ball after next 10 seconds?
300°C
320°C
350°C

Not determinable for want of sufficient data
Ques :60
A steam pipe is covered with two layers of insulating materials, with the better insulating material forming the outer part. If the two layers are
interchanged, the heat conducted:1)
Will decrease
Will increase
Will remain unaffected
may increase or decrease depending upon the thickness of each layer
Ques :61





Ques :62
A Prandtl number of a flowing fluid greater than unity indicates that hydrodynamic boundary layer thickness
Greater than thermal boundary layer thicknesss
Equal to thermal boundary layer thickness
Smaller than thermal boundary layer thickness
Independent of thermal boundary layer thickness
Ques :63
For fully developed turbulent flow in a pipe with heating, the Nusselt number Nu, varies with Reynolds number Re and Prandtl number Pr



Ques :64
Heat is lost from a 100 mm diameter steam pipe placed horizontally in ambience at 30°C. If the Nusselt number is 25 and thermal conductivity of
air is 0.03 then the heat transfer coefficient will
7.5 W/m²k
16.2 W/m²k
25.2 W/m²k
30 W/m²k

Ques :65
600 K
330°C
373 K
1000 K
Ques :66




Ques :67
What is the radiation intensity in a particular direction?
Radiation energy per unit time per unit area of the radiating surface
Radiant energy per unit time per unit solid angle per unit area of the radiation surface

Radiant energy per unit time per unit solid angle per unit projected area of the radiation surface in the given direction
Radiant energy per unit time per unit projected area of the radiating surface in the given direction
Ques :68
Which one of the following heat exchangers gives parallel straightline
pattern of temperature distribution for both cold and hot fluids?
Parallelflow
with unequal heat capacities.
Counter flow
with equal heat capacities.
Parallelflow
with equal heat capacities.
Counterflow
with unequal heat capacities.
Ques :69




Ques :70
In a certain heat exchanger,both the fluids have identical mass flow rate specific heat product. The hot fluid enters at 76°C and leaves at 47°C and
the cold fluid entering at 26°C leaves at 55°C. The effectiveness of the heat exchanger is:

0.16
0.58
0.72
1.0
Ques :71
When the air is throttled,there is an entropy increase. For 2 kg/s of air the entropy increase by 0.06 kW/K . The pressure ratio (final to initial state)
is [for air, characteristic gas constant= 0.287
0.9
1.0
0.8
None of these
Ques :72
518.1
kJ/kg
428.3 kJ/kg
1113.7
kJ/kg
None of these
Ques :73
In an otto cycle, twice as much energy is generated per cycle as is rejected through the exhaust. What is the compression ratio? (for air k 1.4)
5.66
7.66

11.2
None of these
Ques :74
0.172
2.4
4.98
0.06
Ques :75
3.55
3.4
3.6
None of these
Ques :76

268.9 m/s
278.5 m/s
300 m/s
None of these
Ques :77
A steam turbine receives steam steadily at 10 bar with an enthalpy of 3000 kJ/kg and discharges at 1 bar with an enthalpy of 2700 kJ/kg. The work
output is 250 kJ/kg . The change in KE and PE are negligible. The heat transfer from the turbine casing to the surroundings is equal to
0 kJ
50 kJ
150 kJ
250 kJ
Ques :78
0.1
0.5

18/28
0.8
Ques :79
Polar moment of inertia of a hollow tube of diameter and thickness is




Ques :80
An air standard Brayton cycle has air entering the compressor at 27 °C and 100 kPa. The pressure ratio is 10 and maximum allowable
temperature in the cycle is 1350 K. The temperature after expansion in the turbine will be
699 K
650 K
630 K

600 K
Ques :81
A uniform rod of length crosssection
area and modulus of elasticity is held rigidly by fixed supports at the ends and an axial load is
applied at mid length of the rod. The strain energy stored is


None of these
Ques :82
Chilled cast iron
Soft on surface
Machine freely
High Resitance to wear
None of these
Ques :83
Three carnot engines B and C having source temperatures of 750 700 K and 650 K have sink temperatures respectively 400 350 K and
300 K . Which engine is least efficient?
Engine A
Engine B

Engine C
none of these
Ques :84
Pearlite is a combination of
Ferrite and cementite
Cementite and gamma iron
Ferrite and austenite
Ferrite and iron graphite
Ques :85
Which of the following is used to find percent idle time for man machines
Work study
Time study
Method study
Worksampling
Ques :86
A four cylinder four stroke petrol engine running at 1000 rpm will have in all how many sparks in one minute?
250
500
1000
2000
Ques :87

LPG mainly consists
Methane and ethane
Propane and butane
Petrol and diesel
Hexane and butadiene
Ques :88
Dynamo in automobile is a
Series generator
Shunt generator
Either of series generator or shunt generator
none of these
Ques :89
Which type of pump is preferred for pumping lubricating oil in automobile:1)
Open impeller type
Centrifugal pump with impeller shrouded on one side only
Centrifugal pump with impeller shrouded on both side only
Gear pump
Ques :90
A thermostat is provided in automobile engines for
Controlling the temperature of the piston
Controlling the temperature of the cooling system
Regulating the temperature of lubricating oil
Regulating the temperature of suction air

Ques :91




Ques :92
A dummy activity:1)
Has no sequence and can be easily fitted anywhere
Has only a head event but no tail event
Has no head event but only a tail event
Neither requires any resources nor any time.
Ques :93
At breakeven point, slope of sales line is equal to
Slope of total expenses line.



Ques :94
A discrepancy is
The difference between a measurement and true value of the quantity measured
The difference between true value of the quantity and error
The difference between measured value and actual value
The difference between measured values of the same quantity
Ques :95
Which of the following is a non contact
type thermometer?
Thermocouple
Bimetallic strip thermometer
Vapour pressure thermometer
Optical pyrometer
Ques :96
A hot wire anemometer is used to measure
Pressure of gases
Liquid discharges
Very low pressure
Gas velocities

Ques :97
A piezoelectric crystal can be used to measure
Temperature
Velocity
Acceleration
Flow
Ques :98
Which of the following material can bear sudden and excessive shocks better?
Cast iron
Pig iron
White iron
Wrought iron
Ques :99
In petrol engine mechanism the piston is at its dead centre position when piston:(
Acceleration is zero Acceleration is maximum Velocity
is zero Velocity is infinity
and
and c
and c
and
Ques :100
OC curves are used for the selection of lots by
Attributes
Variables
Both Attributes and Variables

Non of these