Automobile Engineering

Q1: The main function of the tread pattern on tyre is that

A the tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating

B the crests between the tread grooves absorb road noise

C in wet conditions, the tread grooves expel water that is drawn between the tyre and road surface

D the tread pattern protects the tyre's inner carcass from small stones and pieces of glass

Q2: The positive plates of a lead acid battery has

A lead peroxide (PbO2)

B spongy lead (Pb)

C lead sulphate (PbSO4)

D sulphuric acid (H2SO4)

Q3: The sequence order of events in a four-stroke engine is

A suction - exhaust - power - compression

B suction - power - compression - exhaust

C suction - compression - power - exhaust

D exhaust - compression - power - suction

Q4: The fuel pump in the programmed fuel injection (PFI) system is located

A between the fuel-filler pipe and fuel tank

B in the fuel tank

C on the distributor mounting in the engine compartment

D on the engine compartment bulkhead

Q5: The natural gas is compressed in a CNG cylinder at a pressure of

A 200 bar

B 220 bar

C 250 bar

D 300 bar

Q6: In automobiles G.V.W. refers to

A gross vehicle width

B gross vehicle weight

C gross vehicle wheel base

D gross vehicle wheel track

Q7: The effect of having excess camber is

A excessive steering alignment torque

B hard steering

C too much traction

D uneven tyre wear

Q8: The most commonly used power plant in automobiles is

A gas turbine

B I.C. engine

C battery

D none of these

Q9: The main function of intake manifold is that it

A promotes the mixture of air and fuel

B reduces intake noise

C cools the intake air to a suitable temperature

D distributes intake air equally to the cylinders

Q10: The condition that results in large quantities of CO emission is

A insufficient air during combustion

B insufficient fuel during combustion

C low temperature combustion

D high temperature combustion

Q11: The component that connects the steering rack to the knuckles is

A tie-rod

B sector gear

C pivot

D spline

Q12: The air gap between the central electrode and ground (or side) electrode of a spark plug is around

A 0.2 mm

B 0.5 mm

C 1 mm

D 1.5 mm

Q13: What type of bearing is used for main bearings and connecting rod bearings ?

A Ballbearings

B Plain bearings

C Needle roller bearing

D Taper roller bearing

Q14: The material generally used for cylinder sleeves is

A aluminium

B ceremic

C cast iron

D fibre reinforced plastic

Q15: A clutch is usually designed to transmit maximum torque which is

A equal to the maximum engine torque

B 80 per cent of the maximum engine torque

C 150 per cent of the maximum engine torque

D none of these

Q16: The cetane rating of Diesel fuel is in the order of

A 25

B 45

C 70

D 90

Q17: The advantage of double-wishbone suspension design is that a large amount of freedom is available for setting geometry and precise settings can be made for driving comfort and steerability,

A Correct

B Incorrect

Q18: Which of the following indicates a multigrade oil ?

A SAE 30


C SAE 20 W-50

D API 50

Q19: The engine torque increases with the increase in engine speed up to a certain point after which it starts to fall down.

A Correct

B Incorrect

Q20: The camshaft is driven by the crankshaft via the timing belt.

A Correct

B Incorrect

Q21: The path taken by intake air is

A carburettor (or throttle body) - air cleaner - intake manifold - intake ports - cylinders

B air cleaner - carburettor (or throttle body) -intake ports - intake manifold - cylinders

C air cleaner - intake manifold - carburettor (or throttle body) - intake ports - cylinders

D air cleaner - carburettor (or throttle body) - intake manifold - intake ports - cylinders

Q22: The battery is an electrochemical device, which means battery

A makes chemicals by mechanical means

B uses chemical action to provide electricity

C has curved plates instead of flat plates

D does not use an electrolyte

Q23: The most commonly used supplementary restraint system (SRS) component is

A seat belt

B brake

C airbag

D steering

Q24: 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.

A True

B False

Q25: The condition that causes vapour locking in a brake system is

A overheating of the fluid due to frequent brake application

B overcooling of the brakes during high speed driving

C keeping the vehicle without use for an extended period

D an excessively high engine speed on a downhill road

Q26: The flywheel and the pressure plate bind the clutch disc between them so that the engine and the transmission can be engaged.

A Yes

B No

Q27: The main merit of a multi-cylinder type cylinder sleeve is

A smaller engine dimensions

B better cooling efficiency

C high rigidity

D none of these

Q28: Positive camber is used to compensate for wheels tilting inward due to the weight of the vehicle.

A Yes

B No

Q29: The tilting of the front wheels away from the vertical, when viewed from the front of the car, is called

A camber

B caster

C toe-in

D toe-out

Q30: A traction control system (TCS) in automobiles controls the

A vibrations on the steering wheel

B engine power during acceleration

C torque that is transmitted by the tyres to the road surface

D stopping distance in case of emergency

Q31: The compression ratio in petrol engine is kept less than in Diesel engine because

A it makes petrol engines lighter

B higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition

C less compression ratio gives better performance

D it is just customary to have less compression ratio in petrol engines

Q32: It is necessary to maintain the valve clearances as they

A reduce the resistance to sliding that occurs between the cam and the tappet

B allow for lengthening of the valves owing to the heat of combustion

C increase the speed at which the valves move up and down

D make the crankshaft turn smoothly

Q33: The difference between DOT 3 and DOT 4 brake fluids is

A DOT 4 fluid has a higher boiling point than DOT 3 fluid

B DOT 4 fluid has a lower boiling point than DOT 3 fluid

C DOT 3 and DOT 4 fluids have the same boiling point, but DOT 4 fluid has a longer service life

D DOT 4 fluid is more resistant to freezing than DOT 3 fluid

Q34: The materials used for cylinder block are

A cast iron and steel

B cast iron and aluminium alloy

C steel and aluminium alloy

D brass and steel

Q35: 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.

A True

B False

Q36: In comparison with a radial tyre, one advantage of a bias-ply tyre is

A longer life

B lower rolling resistance

C smoother ride at low speeds

D none of these

Q37: Which of the following is not a part of the chassis ?

A Wheels

B Front axle

C Steering system

D Seats

Q38: The portion of a crankshaft which rests on cylinder block is called main journal.

A Yes

B No

Q39: The function of an alternator in an automobile is to

A supply electric power

B convert mechanical energy into electrical energy

C continually recharge the battery

D partly convert engine power into electric power

Q40: The instrument used to check specific gravity of acid in a battery is

A hydrometer

B hygrometer

C anemometer

D multimeter

Q41: In radial tyres

A one ply layer runs diagonally one way and another layer runs diagonally the other way

B all plies run parallel to one another and vertical to tyre bead

C inner tubes are always used

D none of these

Q42: If the air-fuel mixture in a spark ignition engine is too rich, then air-fuel ratio is about

A 17:1

B 15:1

C 13:1

D 10:1

Q43: The vehicle ride will be comfortable if

A unsprung mass is kept minimum

B sprang mass is kept minimum

C vehicle mass is kept minimum

D all of these

Q44: The diagram which shows the correct crank positions corresponding to the opening and closing of the valves, is known as

A indicator diagram

B axial force diagram

C valve timing diagram

D none of these

Q45: The ignition in a spark ignition engine takes place when the piston is

A exactly at the T.D.C. position on its compression stroke

B approaching the T.D.C. position on its compression stroke

C leaving the T.D.C. position on its compression stroke

D approaching the T.D.C position on its exhaust stroke

Q46: 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.

A Correct

B Incorrect

Q47: The aluminium alloy is used in cylinder blocks because

A it is lighter and have good heat dissipation characteristics

B material cost is low

C it does not require any cylinder liners

D the piston is also made of aluminium alloy

Q48: The camshaft of a four stroke Diesel engine running at 1000 rpm will run at

A 500 rpm

B 1000 rpm

C 2000 rpm

D 4000 rpm

Q49: The motion of the cam is transferred to the rocker arm, moving it upwards and downwards. This rocker-arm motion then forces the valve downwards against the force in the valve spring so that the valve can open.

A True

B False

Q50: The petrol engines are also known as

A spark ignition (S.I.) engines

B compression ignition (C.I.) engines

C steam engines

D none of these

Q51: The firing order for an in-line four cylinder I.C. engine is

A 1-2-3-4

B 1-3-4-2

C 1-2-4-3

D 1-3-2-4

Q52: If the engine coolant leaks into the engine oil, then engine oil

A appears milky

B becomes foamy

C turns black

D none of these

Q53: The motion of the cam is transferred to the valves through

A pistons

B rocker arms

C camshaft pulley

D valve stems

Q54: The valve overlap in four stroke petrol engines is approximately

A 30°

B 60°

C 90°

D 120°

Q55: The torque available at the contact between driving wheels and road is known as

A brake effort

B tractive effort

C clutch effort

D none of these

Q56: The PCV valve incorporates a spring loaded plunger and opens in proportion to the level of vacuum pressure in the intake manifold.

A Agree

B Disagree

Q57: The cetane number of a Diesel fuel is a measure of

A volatility

B viscosity

C ignition quality

D delay peirod

Q58: The engine oil is stored in __________ when the engine is not running.

A oil pan

B cylinder head

C oil pump

D separate oil tank

Q59: If the level of tension in the belt is too high, it can result in a loss of power or in bending of the rotating shaft or crankshaft.

A Correct

B Incorrect

Q60: The coefficient of friction for the clutch facing is approximately

A 0.1

B 0.4

C 0.8

D 1.2

Q61: In a square type engine

A geometrical shape is square

B diameter and length of piston are same

C two cylinders are placed horizontal and two vertical

D stroke length and cylinder bore are same

Q62: Incorrect steering axis inclination (S.A.I.) causes

A tendency to assume toe-out orientation

B generation of a braking effect at tight corners

C poor recovery of the steering wheel after making a turn

D the vehicle to pull to the side of lesser inclination

Q63: The oil pump is driven by the

A camshaft

B alternator shaft

C crankshaft via drive belt

D crankshaft directly

Q64: Which of the following symptom is caused as a result of brake disc run out ?

A Ineffectiveness of the brakes

B Judder during braking

C Localized wearing of the brake pads

D Rapid wearing of the brake pads

Q65: The operation of removing trapped air from the hydraulic braking system is known as

A trapping

B tapping

C bleeding

D cleaning

Q66: The capacity of a battery is usually expressed in terms of

A volts

B amperes

C weight

D ampere-hours

Q67: If the air-fuel mixture ignites before the spark takes place at spark plug, the condition is called

A detonation

B ignition

C pre-ignition

D rumble

Q68: In a ventilated disc brake,

A a duct directs air towards the caliper for cooling while the vehicle is moving

B caliper is covered with cooling fins

C disc contains many small holes for optimum cooling performance

D disc contains radial vanes between its rubbing surfaces for optimum cooling performance


Q69: In a spark plug, when the temperature of the central electrode exceeds a certain temperature, any carbon that has adhered will be burnt off, and the temperature at which this burning off carbon starts is referred to as the self cleaning temperature.

A Correct

B Incorrect

Q70: The basic purpose of tyre rotation on automobiles is to

A avoid ply separation

B equalize wear

C get better ride

D none of these

Q71: The co-efficient of rolling resistance for a truck weighing 63 500 N is 0.018. The rolling resistance to the truck is

A 1.143 N

B 11.43 N

C 114.3 N

D 1143 N

Q72: Which of the following is not an automobile ?

A Motor cycle

B Passenger car

C Aeroplane

D Truck

Q73: Vulcanizing means

A heating rubber under pressure

B spraying with special paint

C melting rubber while stirring it

D none of these

Q74: The information provided by the oxygen (O2) sensor to the feedback control system is about the

A air-fuel ratio

B air temperature

C air flow speed

D exhaust gas volume

Q75: When turning a corner,

A the front wheels are toeing out

B the front wheels are turning on different angles

C the inside front wheels has a greater angle than the outside wheel

D all of the above

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