1000+ Automobile Engineering Multiple Choice Question Answer [Solved]

1. In a single dry plate clutch, torsional vibrations are absorbed by
A. Coil springs known as torsional springs
B. Cushion springs
C. Central hub
D. Clutch pedal
Answer : A

2. The effect of having excess camber is
A. Excessive steering alignment torque
B. Hard steering
C. Too much traction
D. Uneven tyre wear
Answer : D

3. The purpose of transmission in an automobile is
A. To vary the speed of automobile
B. To vary the torque at the wheels
C. To vary the power of automobile
D. None of these
Answer : B

4. One effect of detonation is
A. Delay in ignition
B. Loss of power
C. Overheating of engine
D. Overcooling of engine
Answer : B

5. The correct way to rectify an imbalanced wheel is to
A. Adjust the tyre pressure
B. Rotate the tyres
C. Adjust the damper spring tension
D. Attach appropriate weights to the wheel at appropriate positions
Answer : D

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

7. The effect of vapour locking on the brake performance is that the
A. Brakes function more effectively
B. Brakes fail completely
C. Brake operation is delayed after depression of the brake pedal
D. Vapour locking has no effect on brake performance
Answer : B

8. The coefficient 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
Answer : D

9. 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
Answer : B

10. The lubrication oil flow in an engine is in the order as
A. Oil strainer, oil pump, relief valve, oil filter, cylinder block, cylinder head and oil pan
B. Oil pump, oil strainer, relief valve, oil filter, cylinder block, cylinder head and oil pan
C. Oil strainer, oil filter, relief valve, oil pump, cylinder block, cylinder head and oil pan
D. Oil strainer, oil pump, relief valve, oil filter, cylinder head, cylinder block and oil pan
Answer : A

11. 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
Answer : B

12. The gradient resistance to a vehicle having a mass of 980 kg moving on an incline of 10° is
A. 1.6694 N
B. 16.694 N
C. 166.94 N
D. 1669.4 N
Answer : D

13. If clearance volume of I.C. engines is increased, the compression ratio will
A. Increase
B. Decrease
C. Remain constant
D. Be doubled
Answer : B

14. In a four wheel drive (4WD), the numbers of gear boxes are
A. 1
B. 2
C. 3
D. 4
Answer : B

15. The parking brake generally acts on
A. Front wheels
B. Rear wheels
C. Front and rear wheels
D. Propeller shaft
Answer : B

16. The function of a radiator fan in the cooling system is that
A. It blows air through the radiator when necessary
B. It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump
C. It cools the engine by blowing air onto the cylinder block
D. It draws heat out of the engine compartment
Answer : A

17. 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
Answer : D

18. Clutch facings are usually attached to the plate by
A. Steel rivets
B. Brass rivets
C. Aluminium screws
D. Steel screws
Answer : B

19. The sequence in which the force is transmitted through a brake system when the brake pedal is depressed is
A. Brake pedal, master cylinder, brake lines, vacuum servo mechanism, brake pads
B. Brake pedal, vacuum servo mechanism, master cylinder, brake lines, brake pads
C. Brake pedal, master cylinder, vacuum servo mechanism, brake lines, brake pads
D. Brake pedal, brake lines, vacuum servo mechanism, master cylinder, brake pads
Answer : B

20. Thinner is added to the paint in order to
A. Make pigments and resin mix easily
B. Make paint film hard
C. Optimise its viscosity
D. None of these
Answer : C

21. An oil filter bypass valve opens when the
A. Engine is cold
B. Engine overheats
C. Oil filter becomes clogged
D. Engine runs at high speed
Answer : C

22. The component that connects the steering rack to the knuckles is
A. Tie rod
B. Sector gear
C. Pivot
D. Spline
Answer : A

23. 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

24. The engine oil level should be checked
A. Immediately after the ignition switch is turned off
B. While the engine is running
C. A few minutes after the ignition switch is turned off
D. While the engine is running at high idle speed
Answer : C

25. The engine oil viscosity is defined by _________ ratings.
A. Automatic transmission fluid (ATF)
B. Society of automotive engineers (SAE)
C. Gross vehicle weight (GVW)
D. American petroleum institute (API)
Answer : B

26. The heat transfer from coolant to air in the radiator of an automobile engine takes place by
A. Radiation only
B. Convention only
C. Convection and radiation
D. Conduction, convection and radiation
Answer : C

27. The main task of a battery in automobiles is to
A. Supply electricity to the alternator
B. Act as a reservoir or stabilizer of electricity
C. Supply electricity to the vehicle's electrical system at all times while the engine is running
D. Supply a large amount of power to turn the starter motor when the engine is being started
Answer : D

28. In Diesel engines, the duration between the time of injection and the time of ignition is called
A. Spill cut-off
B. Delay period
C. Injection period
D. Ignition period
Answer : B

29. The connecting rod lower end is connected to the relevant ________ of crankshaft.
A. Big end
B. Crank arm
C. Journal
D. Small end
Answer : C

30. The stroke of an engine is the
A. Volume of the cylinder
B. Length of the connecting rod
C. Internal diameter of the cylinder
D. Distance between T.D.C. and B.D.C.
Answer : D

31. The cam shaft in an engine is always mounted
A. Parallel to the crankshaft
B. Perpendicular to the crankshaft
C. Inclined to the crankshaft
D. None of these
Answer : A

32. In an engine, the temperature of the piston will be more at the
A. Crown of the piston
B. Skirt of the piston
C. Piston walls
D. Piston rings
Answer : A

33. The connecting rods are generally made of ________ shaped crosssection.
A. I
B. C
C. L
D. H
Answer : A

34. 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

35. The ease with which petrol vaporizes is called its
A. Oxidation
B. Octane number
C. Volatility
D. Cetane number
Answer : C

36. The best fuels for compression ignition engines are
A. Straight chain paraffin
B. Aromatics
C. Branched chain paraffin
D. Naphthalene
Answer : D

37. The starting system includes
A. A battery, a starter, and an ignition switch
B. A battery, a distributor, and an ignition switch
C. A battery, a starter, and a distributor
D. A distributor, a starter, and an ignition switch
Answer : A

38. The basic purpose of tyres is to
A. Grip the road and provide good traction
B. Substitute for springs
C. Act as brake
D. None of these
Answer : A

39. The compression ratio of a petrol engine is nearly
A. 4 : 1
B. 8 : 1
C. 15 : 1
D. 20 : 1
Answer : B

40. The air resistance to a car at 20 kmph is R. The air resistance at 40 kmph will be
A. R
B. 2 R
C. 4R
D. 4 R²
Answer : C

41. The self ignition temperature of Diesel as compared to petrol is
A. Higher
B. Lower
C. Same
D. Depends on fuel quality
Answer : B

42. 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

43. The purpose of a cylinder head gasket is to
A. Prevent the combustion gases from leaking from the joint between the cylinder block and the cylinder head
B. Prevent engine oil from going into combustion chamber
C. Removes impurities from cylinder head lubricating oil
D. None of the above
Answer : A

44. 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

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

46. 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
Answer : B

47. The main cause for the change in engine oil viscosity is
A. Humidity
B. Temperature
C. Vibration
D. Contamination
Answer : B

48. The power source for a brake booster is
A. Exhaust manifold pressure
B. Electricity
C. The pressure difference between the atmospheric pressure and the vacuum pressure in the intake manifold
D. Hydraulic pump
Answer : C

49. The function of a proportioning control valve (PCV) in a brake system is to
A. Ensure that equal pressure is supplied to the front and rear brakes throughout every braking operation
B. Reduce the brake fluid pressure when the brakes approach their lockup point
C. Cause less brake fluid pressure to act on the front brakes than on the rear brakes when the fluid pressure exceeds a predetermined level
D. Cause less brake fluid pressure to act on the rear brakes than on the front brakes when the fluid pressure exceeds a predetermined level.
Answer : D

50. The brake warning light warns the driver of
A. Water in the master cylinder
B. Air in the hydraulic system
C. Failure of the primary or secondary circuit of hydraulic system
D. Power brake failure
Answer : C