1000+ Automobile Engineering Multiple Choice Question Answer [Solved]

1. 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

2. 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

3. 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

4. The most effective method of controlling S.I. engine exhaust emission is by
A. Recirculating exhaust
B. Using catalytic converter
C. Using some additives in the fuel
D. None of these
Answer : B

5. Which of the following indicates multigrade oil?
A. SAE 30
B. API SF
C. SAE 20 W50
D. API 50
Answer : C

6. The basic characteristics of a brake fluid is
A. A high boiling point
B. Low viscosity
C. Compatibility with rubber and metal parts
D. All of these
Answer : D

7. 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

8. 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

9. Which of the following parameter can be adjusted by modifying the tie rod attachment length?
A. Camber
B. Caster
C. Toe
D. Steering gear ratio
Answer : C

10. When a gear box has four forward speeds and one reverse speed, it is said to be a
A. 3-speed gear box
B. 4-speed gear box
C. 5-speed gear box
D. 6-speed gear box
Answer : B

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

12. 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
Answer : D

13. 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

14. 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

15. 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

16. The material generally used for cylinder sleeves is
A. Aluminium
B. Ceramic
C. Cast iron
D. Fibre reinforced plastic
Answer : C

17. The Diesel engines are also known as
A. Spark ignition (S.I.) engines
B. Compression ignition (C.I.) engines
C. Steam engines
D. None of these
Answer : B

18. 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

19. The connecting rod connects the piston and the
A. Cylinder head
B. Cylinder block
C. Camshaft
D. Crankshaft
Answer : D

20. The rating of C.I. engine fuel (Diesel) is given by
A. Octane number
B. Performance number
C. Cetane number
D. None of these
Answer : C

21. The damper fluid leakage typically occur from
A. Upper damper mounting
B. Bottom of damper
C. Clearance between inner and outer tubes of damper
D. Coil spring mounting
Answer : C

22. 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

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

24. Which one of the following statement correctly describes the construction of a bevel gear type differential?
A. The drive shafts are splined to the differential carrier.
B. The left side gear and the differential carrier rotate in constant unison.
C. The differential carrier houses differential pinion gears and side gears; each pinion gear meshes with a different side gear.
D. The differential carrier houses differential pinion gears and side gears
Answer : D

25. 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

26. 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

27. The main purpose of an engine's air cleaner is that it
A. Controls the engine's air intake volume
B. Reduces the engine's air intake noise
C. Prevents rain water from entering the engine
D. Prevents dust and other foreign matter from entering the engine
Answer : D

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

29. The temperature indicating instrument in vehicles indicates the temperature of
A. Engine piston
B. Engine cylinder
C. Lubricating oil
D. Jacket cooling water
Answer : D

30. A basic difference between the spark ignition engine and the Diesel engine is that the
A. Diesel engine compresses air alone instead of an air-fuel mixture
B. Air temperature ignites the fuel in the Diesel engine
C. Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke
D. All of the above
Answer : D

31. The characteristic that is enhanced by the use of cylinder sleeves is
A. Cooling efficiency
B. Resistance to wear
C. Lubrication performance
D. None of these
Answer : B

32. 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
Answer : A

33. 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

34. In which of the following conditions, the idle CO percentage should be measured with the vehicle?
A. Headlights and other electrical devices are switched off
B. Headlights and other electrical devices are switched on
C. Headlights and other lights are switched off
D. Headlights are switched on
Answer : A

35. The ignition coil is used to
A. Step up current
B. Step down current
C. Step up voltage
D. Step down voltage
Answer : C

36. A clutch is usually designed to transmit maximum torque which is
A. Equal to the maximum engine torque
B. 80 % of the maximum engine torque
C. 150 % of the maximum engine torque
D. None of these
Answer : C

37. The formula for Isooctane is
A. C8H18
B. C7H17
C. C6H18
D. C7H18
Answer : A

38. 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
Answer : C

39. The specific gravity of Diesel is about
A. 0.65
B. 0.75
C. 0.85
D. 0.95
Answer : C

40. The gear shift lever requires two separate motions to shift gears, and the first movement
A. Moves the synchronizer
B. Selects the synchronizer
C. Meshes the gears
D. Operates the clutch
Answer : B

41. 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

42. 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

43. Caster is a
A. Forward tilt of the kingpin
B. Backward tilt of the kingpin
C. Either 'A' or 'B'
D. None of these
Answer : C

44. If the air-fuel mixture in a spark ignition engine is too rich, then airfuel ratio is about
A. 17 : 1
B. 15 : 1
C. 13 : 1
D. 10 : 1
Answer : D

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

46. 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

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

48. The aluminium alloy is used in cylinder blocks because
A. It is lighter and has 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
Answer : A

49. The mechanical efficiency (?m) of an I.C. engine is equal to (where I.P. = Indicated power, B.P. = Brake power and F.P. = Frictional power)
A. I.P/B.P.
B. B.P/I.P.
C. B.P/F.P.
D. F.P/B.P.
Answer : B

50. The painting of automobiles is done to
A. Prevent rust from growing on the body
B. Improve its external appearance
C. Retain the characteristics of steel for long
D. All of these
Answer : D