Q.1

The basic characteristics of a brake fluid is

  • a high boiling point
  • low viscosity
  • compatibility with rubber and metal parts
  • all of these
Q.2

Which part of the automobile tyre is subjected to greatest flexing action ?

  • Bead
  • Side wall
  • Shoulder
  • Tread
Q.3

The calorific value of petrol is about

  • 36.5 - 38.5 MJ/kg
  • 39.4 - 42.5 MJ/kg
  • 42.7 - 43.5 MJ/kg
  • 45.5 - 47 MJ/kg
Q.4

The starter motor is driven by

  • chain drive
  • gear drive
  • flat belt drive
  • V-belt drive
Q.5

The main purpose of an engine's air cleaner is that it

  • controls the engine's air intake volume
  • reduces the engine's air intake noise
  • prevents rain water from entering the engine
  • prevents dust and other foreign matter from entering the engine
Q.6

During suction stroke, the inside pressure of cylinder is

  • more than the atmospheric pressure
  • less than the atmospheric pressure
  • equal to the atmospheric pressure
  • none of these
Q.7

The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to

  • enable the pump's fault-diagnosis function to operate
  • warm up and lubricate the pump
  • supply a large amount of fuel and thereby create a choke effect
  • pressurise the fuel system before the engine is started
Q.8

The composition of the electrolyte in a fully charged battery is that

  • the electrolyte is pure distilled water
  • the electrolyte is pure sulphuric acid
  • the electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight
  • the electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight
Q.9

The function of a carburettor is to control the amount and ratio of air-fuel mixture.

  • True
  • False
Q.10

The process of supplying the intake air to the engine cylinder at a pressure greater than the pressure of the surrounding atmosphere is known as

  • supercharging
  • auto-ignition
  • scavenging
  • detonation
Q.11

The temperature indicating instrument in vehicles indicates the temperature of

  • engine piston
  • engine cylinder
  • lubricating oil
  • jacket cooling water
Q.12

The petrol engine works on

  • Otto cycle
  • Carnot cycle
  • Diesel cycle
  • Rankine cycle
Q.13

The temperature at which tyre inflation pressure should be checked is

  • 20°C
  • 25°C
  • 35°C
  • ambient temperature
Q.14

The ball joints are used on the tie-rod ends, because they

  • reduce the amount of noise generated
  • reduce the amount of sliding resistance
  • can deal with movement of the suspension both vertically and in other directions
  • improve the force transmission speed
Q.15

The correct flow of power through the drive train is

  • engine - driveshafts - clutch - mainshaft - countershaft - final driven gear - wheels
  • engine - clutch - mainshaft - countershaft - final driven gear - driveshafts - wheels
  • engine - clutch - countershaft - mainshaft - final driven gear - driveshafts - wheels
  • engine - mainshaft - countershaft - clutch - final driven gear - driveshafts - wheels
Q.16

The device for smoothening out the power impulses from the engine is called

  • clutch
  • differential
  • flywheel
  • torque converter
Q.17

The piston compression rings are made of

  • cast iron
  • steel
  • aluminium
  • bronze
Q.18

The function of a first compression ring (top ring) is that it

  • increases the combustion temperature
  • creates swirl
  • maintains a seal and prevents the fuel leakage
  • maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber
Q.19

The function of an oil control orifice is that it

  • returns cylinder head lubricating oil to the oil pan at high speed
  • turns oil into fine mist for spray lubrication
  • regulates the pressure of engine oil supplied by the oil pump for the lubrication of cylinder head mechanism and other purposes
  • removes impurities from cylinder head lubricating oil
Q.20

In which of the following conditions, the idle CO percentage should be measured with the vehicle ?

  • Headlights and other electrical devices are switched off.
  • Headlights and other electrical devices are switched on.
  • Headlights and other lights are switched off.
  • Headlights are switched on.
Q.21

The basic purpose of a four wheel drive (4WD) system is that it

  • delivers improved cornering on dry road surfaces
  • eliminates the need of snow tyres, tyre chains, etc.
  • ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces
  • ensures that effective braking can be performed, even on slippery surfaces
Q.22

The component in the radiator of an automobile that increases the boiling point of water is

  • drain plug
  • water jacket
  • vacuum valve
  • pressure cap
Q.23

In aluminium cylinder blocks, the cylinder liners are made of

  • aluminium
  • ceramic
  • brass
  • cast iron
Q.24

The ignition coil is used to

  • step up current
  • step down current
  • step up voltage
  • step down voltage
Q.25

The gradient resistance to a vehicle having a mass ofkg moving on an incline ofis

  • 1.6694 N
  • 16.694 N
  • 166.94 N
  • 1669.4 N
Q.26

The most effective method of controlling S.I. engine exhaust emission is by

  • recirculating exhaust
  • using catalytic converter
  • using some additives in the fuel
  • none of these
Q.27

The tyre rotation is generally done at

  • 1000 km
  • 4000 km
  • 6000 km
  • 10000 km
Q.28

When indicated power (I.P.) and frictional power (F.P.) are known, we can calculate

  • brake power
  • compression ratio
  • specific air consumption
  • mean effective pressure
Q.29

A basic difference between the spark ignition engine and the Diesel engine is that the

  • Diesel engine compresses air alone instead of an air-fuel mixture
  • air temperature ignites the fuel in the Diesel engine
  • fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke
  • all of the above
Q.30

Damper in an automobile is used to

  • absorb the energy
  • dissipate the energy
  • release the energy
  • increase the energy
Q.31

An oil filter bypass valve opens when the

  • engine is cold
  • engine overheats
  • oil filter becomes clogged
  • engine runs at high speed
Q.32

The calorific value of Diesel is about

  • 36.5 MJ/kg
  • 38.5 MJ/kg
  • 42.5 MJ/kg
  • 45.5 MJ/kg
Q.33

The negative plates of a lead acid battery has

  • lead peroxide (PbO2)
  • spongy lead (Pb)
  • lead sulphate (PbSO4)
  • sulphuric acid (H2SO4)
Q.34

The air resistance to a car atkmph is R. The air resistance atkmph will be

  • R
  • 2 R
  • 4R
  • 4 R2
Q.35

The octane number of compressed natural gas (CNG) is

  • 90
  • 100
  • 110
  • 120
Q.36

The compression ratio for Diesel engines usually lies in the range of

  • 6-10
  • 10-15
  • 15-25
  • 25-40
Q.37

The main function of a master cylinder is to

  • adjust the extent of brake pedal free play
  • boost the force applied to brake pedal
  • convert brake pedal force into hydraulic pressure
  • ensure that all the wheel brakes are supplied with the same amount of fluid pressure
Q.38

The aspect ratio (expressed in percentage) of the tyre is defined as the ratio of

  • section width to section height
  • section height to section width
  • wheel diameter to section height
  • wheel diameter to section width
Q.39

The number of exhaust manifolds in a V-6 engine are

  • one
  • two
  • four
  • eight
Q.40

The advantage of having a tandem master cylinder arrangement in automobiles is that it

  • enhances safety by serving two independent lines in a divided-line brake circuit
  • enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss
  • supplies equal fluid pressure to each line of a divided-line brake circuit, thereby preventing the brakes from dragging on one side
  • boosts the brake fluid pressure to reduce the force required to depress the brake pedal
Q.41

The mechanical efficiency (ηm) of an I.C. engine is equal to (where I.P. = Indicated power, B.P. = Brake power and F.P. = Frictional power)

  • I.P/B.P.
  • B.P/I.P.
  • B.P/F.P
  • F.P./B.P.
Q.42

The heat transfer from coolant to air in the radiator of an automobile engine takes place by

  • radiation only
  • convention only
  • convection and radiation
  • conduction, convection and radiation
Q.43

In vehicles with tilt steering, the steering column is pivoted in

  • upper bracket
  • lower bracket
  • tilt bracket
  • steering yoke joint
Q.44

The purpose of a balancer shaft is to

  • balance the timing in the movement of the two groups of pistons
  • increase inertia force of the rotating crankshaft
  • reduce vibrations caused by the crankshaft rotation
  • adjust the timing of the intake and exhaust valve openings
Q.45

The process of removing the burnt gases from the engine cylinder by the fresh charge coming into the engine cylinder from the crank-case, is known as

  • cleaning
  • priming
  • scavenging
  • detonation
Q.46

The reconditioning process used to give cylinder bore surfaces a cross-hatch pattern, is known as

  • honing
  • porous plating
  • boring
  • shot peening
Q.47

The power actually developed inside the engine cylinder is called as

  • indicated power
  • brake power
  • frictional power
  • none of these
Q.48

The function of a proportioning control valve (PCV) in a brake system is to

  • ensure that equal pressure is supplied to the front and rear brakes throughout every braking operation
  • reduce the brake fluid pressure when the brakes approach their lockup point
  • cause less brake fluid pressure to act on the front brakes than on the rear brakes when the fluid pressure exceeds a predetermined level
  • cause less brake fluid pressure to act on the rear brakes than on the front brakes when the fluid pressure exceeds a predetermined level.
Q.49

A battery can be charged by

  • adding distilled water
  • adding sulphuric acid
  • applying voltage in the reverse direction to that of charging
  • applying a voltage in the same direction to that of charging
Q.50

The cam shaft in an engine is always mounted

  • parallel to the crankshaft
  • perpendicular to the crankshaft
  • inclined to the crankshaft
  • none of these
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