Q.1

The vehicle ride will be comfortable if

  • unsprung mass is kept minimum
  • sprang mass is kept minimum
  • vehicle mass is kept minimum
  • all of these
Q.2

In a ventilated disc brake,

  • a duct directs air towards the caliper for cooling while the vehicle is moving
  • caliper is covered with cooling fins
  • disc contains many small holes for optimum cooling performance
  • disc contains radial vanes between its rubbing surfaces for optimum cooling performance
Q.3

If the air-fuel mixture ignites before the spark takes place at spark plug, the condition is called

  • detonation
  • ignition
  • pre-ignition
  • rumble
Q.4

The main function of intake manifold is that it

  • promotes the mixture of air and fuel
  • reduces intake noise
  • cools the intake air to a suitable temperature
  • distributes intake air equally to the cylinders
Q.5

The effect of having excess camber is

  • excessive steering alignment torque
  • hard steering
  • too much traction
  • uneven tyre wear
Q.6

If the engine coolant leaks into the engine oil, then engine oil

  • appears milky
  • becomes foamy
  • turns black
  • none of these
Q.7

The valve overlap in four stroke petrol engines is approximately

  • 30°
  • 60°
  • 90°
  • 120°
Q.8

The most commonly used supplementary restraint system (SRS) component is

  • seat belt
  • brake
  • airbag
  • steering
Q.9

Incorrect steering axis inclination (S.A.I.) causes

  • tendency to assume toe-out orientation
  • generation of a braking effect at tight corners
  • poor recovery of the steering wheel after making a turn
  • the vehicle to pull to the side of lesser inclination
Q.10

The function of an alternator in an automobile is to

  • supply electric power
  • convert mechanical energy into electrical energy
  • continually recharge the battery
  • partly convert engine power into electric power
Q.11

The petrol engines are also known as

  • spark ignition (S.I.) engines
  • compression ignition (C.I.) engines
  • steam engines
  • none of these
Q.12

The natural gas is compressed in a CNG cylinder at a pressure of

  • 200 bar
  • 220 bar
  • 250 bar
  • 300 bar
Q.13

In a unit type body (frameless body) design, the sheet metal parts are welded together, forming a frame work to which outer skin is attached.

  • True
  • False
Q.14

A clutch is usually designed to transmit maximum torque which is

  • equal to the maximum engine torque
  • 80 per cent of the maximum engine torque
  • 150 per cent of the maximum engine torque
  • none of these
Q.15

What type of bearing is used for main bearings and connecting rod bearings ?

  • Ballbearings
  • Plain bearings
  • Needle roller bearing
  • Taper roller bearing
Q.16

Which of the following indicates a multigrade oil ?

  • SAE 30
  • API SF
  • SAE 20 W-50
  • API 50
Q.17

The cetane rating of Diesel fuel is in the order of

  • 25
  • 45
  • 70
  • 90
Q.18

The torque available at the contact between driving wheels and road is known as

  • brake effort
  • tractive effort
  • clutch effort
  • none of these
Q.19

A traction control system (TCS) in automobiles controls the

  • vibrations on the steering wheel
  • engine power during acceleration
  • torque that is transmitted by the tyres to the road surface
  • stopping distance in case of emergency
Q.20

It is necessary to maintain the valve clearances as they

  • reduce the resistance to sliding that occurs between the cam and the tappet
  • allow for lengthening of the valves owing to the heat of combustion
  • increase the speed at which the valves move up and down
  • make the crankshaft turn smoothly
Q.21

The coefficient of friction for the clutch facing is approximately

  • 0.1
  • 0.4
  • 0.8
  • 1.2
Q.22

The air gap between the central electrode and ground (or side) electrode of a spark plug is around

  • 0.2 mm
  • 0.5 mm
  • 1 mm
  • 1.5 mm
Q.23

In radial tyres

  • one ply layer runs diagonally one way and another layer runs diagonally the other way
  • all plies run parallel to one another and vertical to tyre bead
  • inner tubes are always used
  • none of these
Q.24

The component that connects the steering rack to the knuckles is

  • tie-rod
  • sector gear
  • pivot
  • spline
Q.25

The cetane number of a Diesel fuel is a measure of

  • volatility
  • viscosity
  • ignition quality
  • delay peirod
Q.26

The aluminium alloy is used in cylinder blocks because

  • it is lighter and have good heat dissipation characteristics
  • material cost is low
  • it does not require any cylinder liners
  • the piston is also made of aluminium alloy
Q.27

The condition that causes vapour locking in a brake system is

  • overheating of the fluid due to frequent brake application
  • overcooling of the brakes during high speed driving
  • keeping the vehicle without use for an extended period
  • an excessively high engine speed on a downhill road
Q.28

In a fuel injection system, the electronic control module (ECM) calculates the optimum fuel-injection volume for the engine condition based on the data received from the sensors, and injects this volume of fuel into the intake manifold at the optimum timing.

  • Correct
  • Incorrect
Q.29

The portion of a crankshaft which rests on cylinder block is called main journal.

  • Yes
  • No
Q.30

The tilting of the front wheels away from the vertical, when viewed from the front of the car, is called

  • camber
  • caster
  • toe-in
  • toe-out
Q.31

A baffle plate is fitted inside the oil pan to prevent the oil from splashing when it is subjected to vibration and other movement during vehicle operation.

  • True
  • False
Q.32

The main function of the tread pattern on tyre is that

  • the tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating
  • the crests between the tread grooves absorb road noise
  • in wet conditions, the tread grooves expel water that is drawn between the tyre and road surface
  • the tread pattern protects the tyre's inner carcass from small stones and pieces of glass
Q.33

The motion of the cam is transferred to the valves through

  • pistons
  • rocker arms
  • camshaft pulley
  • valve stems
Q.34

The compression ratio in petrol engine is kept less than in Diesel engine because

  • it makes petrol engines lighter
  • higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition
  • less compression ratio gives better performance
  • it is just customary to have less compression ratio in petrol engines
Q.35

Which of the following symptom is caused as a result of brake disc run out ?

  • Ineffectiveness of the brakes
  • Judder during braking
  • Localized wearing of the brake pads
  • Rapid wearing of the brake pads
Q.36
The main function of intake manifold is that it
  • promotes the mixture of air and fuel
  • reduces intake noise
  • cools the intake air to a suitable temperature
  • distributes intake air equally to the cylinders
Q.37

Free pedal play in car clutches is about

  • 15 mm
  • 25 mm
  • 40mm
  • 60 mm
Q.38

The maximum torque multiplication ratio in a torque converter is about

  • 2.5
  • 10
  • 25
  • 40
Q.39

The main function of the brake fluid is

  • lubrication
  • power transmission
  • cooling
  • none of these
Q.40

The self ignition temperature of Diesel as compared to petrol is

  • higher
  • lower
  • same
  • depends on fuel quality
Q.41

Tachometer in a vehicle measures

  • speed
  • distance
  • engine r.p.m.
  • fuel consumption
Q.42

The purpose of a thermostat in an engine cooling system is to

  • prevent the coolant from boiling
  • allow the engine to warm up quickly
  • indicate the coolant temperature
  • pressurise the system to raise the boiling point
Q.43

A three way catalytic converter

  • recirculates exhaust gasses
  • burns fuel vapaour gasses
  • reduces N2, H2O, and CO2 emission levels
  • removes CO, HC, and NO2 from the exhaust gasses passing through it
Q.44

The caster is called positive when the top of the king pin is inclined to the

  • rear of the vehicle
  • front of the vehicle
  • left of the vehicle
  • right of the vehicle
Q.45

The discharged lead-acid battery has on its plates

  • lead peroxide (PbO2)
  • spongy lead (Pb)
  • lead sulphate (PbSO4)
  • sulphuric acid (H2SO4)
Q.46

For the same maximum pressure and temperature

  • Diesel cycle is more efficient than Otto cycle
  • Otto cycle is more efficient than Diesel cycle
  • both Otto cycle and Diesel cycle are equally efficient
  • none of the above
Q.47

The sequence in which the force is transmitted through a brake system when the brake pedal is depressed is

  • brake pedal - master cylinder - brake lines - vacuum servo mechanism - brake pads
  • brake pedal - vacuum servo mechanism - master cylinder - brake lines - brake pads
  • brake pedal - master cylinder - vacuum servo mechanism - brake lines - brake pads
  • brake pedal - brake lines - vacuum servo mechanism - master cylinder - brake pads
Q.48

The parking brakes employed in vehicles are operated

  • mechanically
  • hydraulically
  • pneumatically
  • none of these
Q.49

With the increase of battery temperature, the specific gravity of electrolyte

  • increases
  • decreases
  • reamains the same
  • none of these
Q.50

One effect of detonation is

  • delay in ignition
  • loss of power
  • overheating of engine
  • overcooling of engine
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