1000+ Automobile Engineering Multiple Choice Question Answer [Solved]

1. The component in the radiator of an automobile that increases the boiling point of water is
A. Drain plug
B. Water jacket
C. Vacuum valve
D. Pressure cap
Answer : D

2. The firing order for an inline 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
Answer : B

3. The condition that results in large quantities of HC emission is
A. High temperature combustion
B. Incomplete combustion
C. Low temperature combustion
D. High atmospheric temperature combustion
Answer : B

4. Engine misfiring is likely to result from
A. Spark plug gap too small
B. Spark plug gap too wide
C. Vapours lock in the fuel only
D. Incorrect fuel air mixture
Answer : B

5. Vulcanizing means
A. Heating rubber under pressure
B. Spraying with special paint
C. Melting rubber while stirring it
D. None of these
Answer : A

6. The crankshaft of a typical inline four cylinder engine has ________ balance weights.
A. 12
B. 4
C. 16
D. 8
Answer : D

7. The brake pedal during ABS operation
A. Is pushed upward forcefully
B. Pedal stroke becomes longer
C. Transmits slight kickback to the driver's foot
D. All of the above
Answer : C

8. Two speed reverse gear arrangements is generally provided in case of
A. Passenger cars
B. Matadors
C. Tractors
D. Trucks
Answer : C

9. The piston compression rings are made of
A. Cast iron
B. Steel
C. Aluminium
D. Bronze
Answer : A

10. A three way catalytic converter
A. Re-circulates exhaust gases
B. Burns fuel vapour gases
C. Reduces N?, H?O, and CO? emission levels
D. Removes CO, HC, and NO? from the exhaust gasses passing through it
Answer : D

11. When the battery is half (50%) charged, the specific gravity of acid in a battery is usually
A. 0.74
B. 1.00
C. 1.12
D. 1.19
Answer : D

12. Cushioning springs in clutch plate reduces
A. Vehicle speed
B. Torsional vibrations
C. Jerky starts
D. None of these
Answer : C

13. 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
Answer : B

14. The negative terminal post on the top of a battery is
A. Smaller than the positive terminal post
B. Larger than the positive terminal post
C. Of the same size as the positive terminal post
D. None of these
Answer : A

15. The capacity of a battery is usually expressed in terms of
A. Volts
B. Amperes
C. Weight
D. Ampere hours
Answer : D

16. The advantage of a tubeless tyre over tube type tyre is
A. Slow air leakage
B. Better fuel efficiency
C. Less chances of running flat
D. All of these
Answer : D

17. 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
Answer : A

18. A four cylinder engine has a capacity of 2.4 litres. The swept volume of one cylinder is
A. 400 cm³
B. 600 cm³
C. 1200 cm³
D. 2400 cm³
Answer : B

19. The service brakes employed in cars are generally operated
A. Mechanically
B. Hydraulically
C. Pneumatically
D. None of these
Answer : B

20. Two advantages of using helical gears rather than spur gears in a transmission system are
A. Strength and cost
B. Strength and less end thrust
C. Noise level and strength
D. Noise level and economy
Answer : C

21. The function of an alternator in an automobile is to
A. Supply electric power
B. Converts mechanical energy into electrical energy
C. Continually recharges the battery
D. Partly converts engine power into electric power
Answer : C

22. The function of positive crankcase ventilation (PCV) system is that it
A. Mixes fuel with air
B. Promotes combustion by creating a swirling movement in the air-fuel mixture
C. Returns blow by gases from the crankcase to the intake system
D. Feeds blow by gases to the exhaust manifold
Answer : C

23. 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
Answer : D

24. The main feature of Macpherson strut suspension is that
A. The vertical size of the suspension can be made more compact
B. Non vertical external forces are supported by the suspension arms
C. The unsprung mass in lighter
D. The assembly is slightly more complicated in design
Answer : B

25. 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
Answer : B

26. The basic part of the engine, to which the other engine parts are attached or assembled is the
A. Cylinder head
B. Crankshaft
C. Cylinder block
D. Oil pan
Answer : C

27. The size of engine cylinder is referred in terms of its
A. Diameter and bore
B. Displacement and efficiency
C. Bore and stroke
D. Bore and length
Answer : C

28. The Diesel engine works on
A. Otto cycle
B. Carnot cycle
C. Diesel cycle
D. Rankine cycle
Answer : C

29. 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
Answer : A

30. 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
Answer : C

31. In Diesel engines, during suction stroke, ________ is drawn in the cylinder.
A. Air and fuel
B. Only fuel
C. Only air
D. None of these
Answer : C

32. The main characteristics of a maintenance free (MF) battery is that
A. A maintenance free battery requires little maintenance during normal use and it is sufficient to add water instead of an electrolyte containing sulphuric acid
B. A maintenance free battery has a relatively short shelf life when compared with standard batteries
C. Since it is sealed, the water in maintenance free battery is not lost through evaporation thus accordingly it is not necessary to top up the cells with water
D. Recharging of a maintenance free battery is neither required nor possible
Answer : C

33. The correct flow of power through the drive train is
A. Engine drive shafts, clutch, main shaft, counter shaft, final driven gear, wheels
B. Engine clutch, main shaft, counter shaft, final driven gear, drive shafts, wheels
C. Engine clutch, counter shaft, main shaft, final driven gear, drive shafts, wheels
D. Engine main shaft, counter shaft, clutch, final driven gear, drive shafts, wheels
Answer : B

34. 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
Answer : B

35. The rolling resistance is because of the friction between the
A. Wheel rim and tyre
B. Tyre and the road surface
C. Wheel rim and road surface
D. None of these
Answer : B

36. Damper in an automobile is used to
A. Absorb the energy
B. Dissipate the energy
C. Release the energy
D. Increase the energy
Answer : B

37. In aluminium cylinder blocks, the cylinder liners are made of
A. Aluminium
B. Ceramic
C. Brass
D. Cast iron
Answer : D

38. The minimum parking brake force is generally ________ of gross vehicle mass (GVM).
A. 5 %
B. 10 %
C. 15 %
D. 20 %
Answer : D

39. When the front wheels of a vehicle are locked during braking, then
A. Stopping distance becomes extremely long
B. Front tyres skid across the road surface, and the vehicle spins around
C. Rear tyres skid across the road surface, and the vehicle spins around
D. Driver loses control over the steering, and the vehicle continues moving in its current direction
Answer : D

40. The purpose of a thermostat in an engine cooling system is to
A. Prevent the coolant from boiling
B. Allow the engine to warm up quickly
C. Indicate the coolant temperature
D. Pressurise the system to raise the boiling point
Answer : B

41. The difference between DOT 3 and DOT 4 brake fluids is
A. DOT 4 fluids have a higher boiling point than DOT 3 fluid
B. DOT 4 fluids have 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
Answer : A

42. An underinflated tyre will wear the tread most
A. Near the centre
B. Near the edges
C. In the lateral direction
D. In the cross direction
Answer : B

43. The instrument used to check specific gravity of acid in a battery is
A. Hydrometer
B. Hygrometer
C. Anemometer
D. Multimeter
Answer : A

44. The two kinds of piston rings are
A. Compression and oil control rings
B. Compression and sliding seal rings
C. Oil scrapper and oil control rings
D. Pressure and sealing rings
Answer : A

45. 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
Answer : D

46. If the valve clearances are excessively large, the problem that can arise is
A. Overheating of the engine
B. Incomplete valve closure
C. Fouling of spark plug by gasoline
D. None of these
Answer : B

47. In a four stroke engine for each crankshaft revolution, the camshaft revolves
A. One half turn
B. One turn
C. Two turns
D. Four turns
Answer : A

48. The main function of a master cylinder is to
A. Adjust the extent of brake pedal free play
B. Boost the force applied to brake pedal
C. Convert brake pedal force into hydraulic pressure
D. Ensure that all the wheel brakes are supplied with the same amount of fluid pressure
Answer : C

49. The purpose of adding pigment to the paint is that it
A. Optimises the viscosity of paint
B. Makes paint film hard
C. Gives colour and filling up effect to the paint
D. None of the above
Answer : C

50. 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
Answer : A