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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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


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