1000+ Automobile Engineering MCQ for SSC CGL [Solved]

1. Highest useful compression ratio (HUCR) is the highest compression ratio at which the
A. Engine can run
B. Engine gives maximum output
C. Engine is most efficient
D. Fuel can be used in a test engine without knocking
Answer : D

2. 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

3. 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

4. For the same maximum pressure and temperature
A. Diesel cycle is more efficient than Otto cycle
B. Otto cycle is more efficient than Diesel cycle
C. Both Otto cycle and Diesel cycle are equally efficient
D. None of the above
Answer : A

5. Wheel base of a vehicle is the
A. Distance between the centres of the front and rear wheels
B. Distance between the centres of the front tyres
C. Distance between the centres of the rear tyres
D. Extreme length of the vehicle
Answer : A

6. Which of the following is not an automobile?
A. Motor cycle
B. Passenger car
C. Aeroplane
D. Truck
Answer : C

7. 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

8. The main function of the brake fluid is
A. Lubrication
B. Power transmission
C. Cooling
D. None of these
Answer : B

9. The specific gravity of petrol is about
A. 0.75
B. 0.85
C. 0.95
D. 1.25
Answer : A

10. 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

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

12. 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

13. In bias ply tyres
A. All plies run parallel to one another
B. Belts of steel mesh are used in the tyres
C. One ply layer runs diagonally one way and another layer runs diagonally the other way
D. All of the above
Answer : C

14. The frequency of flashing of light per minute in a direction (side turn) indicator is about
A. 9
B. 90
C. 900
D. 9000
Answer : B

15. The positive plates of a lead acid battery has
A. Lead peroxide (PbO?)
B. Spongy lead (Pb)
C. Lead sulphate (PbSO?)
D. Sulphuric acid (H?SO?)
Answer : A

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

17. The component that is responsible for converting the rotation of the steering wheel into lateral motion is the
A. Steering wheel
B. Steering shaft
C. Steering gearbox
D. Tie rod
Answer : C

18. The advantage of having a tandem master cylinder arrangement in automobiles is that it
A. Enhances safety by serving two independent lines in a divided line brake circuit
B. Enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss
C. Supplies equal fluid pressure to each line of a divided line brake circuit, thereby preventing the brakes from dragging on one side
D. Boosts the brake fluid pressure to reduce the force required to depress the brake pedal
Answer : A

19. The discharged lead acid battery has on its plates
A. Lead peroxide (PbO?)
B. Spongy lead (Pb)
C. Lead sulphate (PbSO?)
D. Sulphuric acid (H?SO?)
Answer : C

20. 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

21. The power actually developed inside the engine cylinder is called as
A. Indicated power
B. Brake power
C. Frictional power
D. None of these
Answer : A

22. 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

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

24. 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

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. A worm gear is used as the pinion for the rack and pinion type of steering gearbox, because it
A. Improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion
B. Allows the steering wheel to be turned by a greater amount when steering
C. Makes the steering more responsive
D. Reduces the amount of kickback for large steering angles
Answer : A

27. 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

28. 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

29. 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

30. The connecting rod is attached to the piston by the
A. Cap bolt
B. Piston pin
C. Cap roller bearing
D. Rod cap
Answer : B

31. Tachometer in a vehicle measures
A. Speed
B. Distance
C. Engine r.p.m.
D. Fuel consumption
Answer : C

32. 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

33. 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

34. How many cells are used in a 12 volt car battery?
A. 2
B. 4
C. 6
D. 8
Answer : C

35. The aspect ratio (expressed in percentage) of the tyre is defined as the ratio of
A. Section width to section height
B. Section height to section width
C. Wheel diameter to section height
D. Wheel diameter to section width
Answer : B

36. The caster is called positive when the top of the king pin is inclined to the
A. Rear of the vehicle
B. Front of the vehicle
C. Left of the vehicle
D. Right of the vehicle
Answer : A

37. The function of a first compression ring (top ring) is that it
A. Increases the combustion temperature
B. Creates swirl
C. Maintains a seal and prevents the fuel leakage
D. Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber
Answer : D

38. A battery can be charged by
A. Adding distilled water
B. Adding sulphuric acid
C. Applying voltage in the reverse direction to that of charging
D. Applying a voltage in the same direction to that of charging
Answer : C

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

40. When the top of the wheel is tilted outward, then it is called
A. Positive camber
B. Negative camber
C. Positive caster
D. Negative caster
Answer : A

41. 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

42. 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

43. When indicated power (I.P.) and frictional power (F.P.) are known, we can calculate
A. Brake power
B. Compression ratio
C. Specific air consumption
D. Mean effective pressure
Answer : A

44. 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

45. The crescent shaped cavity on the piston head top surface is called as
A. Piston oil hole
B. Snap ring
C. Valve recess
D. Valve clearance
Answer : C

46. The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to
A. Enable the pump's fault diagnosis function to operate
B. Warm up and lubricate the pump
C. Supplies a large amount of fuel and thereby creates a choke effect
D. Pressurise the fuel system before the engine is started
Answer : D

47. 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

48. The braking control type traction control system (TCS) generally operates in the speed range of
A. Less than 20 kmph
B. Less than 40 kmph
C. Less than 60 kmph
D. More than 60 kmph
Answer : B

49. The most commonly used power plant in automobiles is
A. Gas turbine
B. I.C. engine
C. Battery
D. None of these
Answer : B

50. An imbalance wheel during vehicle operation
A. Makes large noise when its heavy point hits the road surface
B. Deflects in the vehicle's longitudinal direction
C. Bounces vertically or deflects from side to side (as seen from front or rear)
D. Creates a standing wave
Answer : C