Automobile Engineering MCQ Mechanical Engineering

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About Automobile Engineering

Following are some of the multiple choice questions on the Automobile Engineering with answers that will help the students in developing their knowledge.

Automobile Engineering MCQ

1. The power source for a brake booster is

  • Exhaust manifold pressure
  • Electricity
  • The pressure difference between the atmospheric pressure and the vacuum pressure in the intake manifold
  • Hydraulic pump

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

  • 1-2-3-4
  • 1-3-4-2
  • 1-2-4-3
  • 1-3-2-4

3. The condition that causes vapour locking in a brake system is

  • Overheating of the fluid due to frequent brake application
  • Overcooling of the brakes during high speed driving
  • Keeping the vehicle without use for an extended period
  • An excessively high engine speed on a downhill road

4. The device for smoothening out the power impulses from the engine is called

  • Clutch
  • Differential
  • Flywheel
  • Torque converter

5. The component that connects the steering rack to the knuckles is

  • tie-rod
  • sector gear
  • pivot
  • spline

6. Which of the following indicates a multigrade oil ?

  • SAE 30
  • API SF
  • SAE 20 W-50
  • API 50

7. The cetane number of a Diesel fuel is a measure of

  • volatility
  • viscosity
  • ignition quality
  • delay peirod

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

  • 0.2 mm
  • 0.5 mm
  • 1 mm
  • 1.5 mm

9. The cetane rating of Diesel fuel is in the order of

  • 25
  • 45
  • 70
  • 90

10. The most commonly used supplementary restraint system (SRS) component is

  • seat belt
  • brake
  • airbag
  • steering

11. The compression ratio in petrol engine is kept less than in Diesel engine because

  • it makes petrol engines lighter
  • higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition
  • less compression ratio gives better performance
  • it is just customary to have less compression ratio in petrol engines

12. The main function of the tread pattern on tyre is that

  • the tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating
  • the crests between the tread grooves absorb road noise
  • in wet conditions, the tread grooves expel water that is drawn between the tyre and road surface
  • the tread pattern protects the tyre's inner carcass from small stones and pieces of glass

13. The tilting of the front wheels away from the vertical, when viewed from the front of the car, is called

  • camber
  • caster
  • toe-in
  • toe-out

14. 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.

  • Correct
  • Incorrect

15. The operation of removing trapped air from the hydraulic braking system is known as

  • trapping
  • tapping
  • bleeding
  • cleaning

16. The battery is an electrochemical device, which means battery

  • makes chemicals by mechanical means
  • uses chemical action to provide electricity
  • has curved plates instead of flat plates
  • does not use an electrolyte

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

  • indicator diagram
  • axial force diagram
  • valve timing diagram
  • none of these

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

  • air-fuel ratio
  • air temperature
  • air flow speed
  • exhaust gas volume

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

  • detonation
  • ignition
  • pre-ignition
  • rumble

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

  • 1.143 N
  • 11.43 N
  • 114.3 N
  • 1143 N

21. 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,

  • Correct
  • Incorrect

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

  • 17:1
  • 15:1
  • 13:1
  • 10:1

23. In a ventilated disc brake,

  • a duct directs air towards the caliper for cooling while the vehicle is moving
  • caliper is covered with cooling fins
  • disc contains many small holes for optimum cooling performance
  • disc contains radial vanes between its rubbing surfaces for optimum cooling performance

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

  • Yes
  • No

25. The main function of intake manifold is that it

  • promotes the mixture of air and fuel
  • reduces intake noise
  • cools the intake air to a suitable temperature
  • distributes intake air equally to the cylinders

26. 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.

  • Correct
  • Incorrect

27. The vehicle ride will be comfortable if

  • unsprung mass is kept minimum
  • sprang mass is kept minimum
  • vehicle mass is kept minimum
  • all of these

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

  • Yes
  • No

29. In radial tyres

  • one ply layer runs diagonally one way and another layer runs diagonally the other way
  • all plies run parallel to one another and vertical to tyre bead
  • inner tubes are always used
  • none of these

30. A traction control system (TCS) in automobiles controls the

  • vibrations on the steering wheel
  • engine power during acceleration
  • torque that is transmitted by the tyres to the road surface
  • stopping distance in case of emergency

31. 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.

  • True
  • False

32. Incorrect steering axis inclination (S.A.I.) causes

  • tendency to assume toe-out orientation
  • generation of a braking effect at tight corners
  • poor recovery of the steering wheel after making a turn
  • the vehicle to pull to the side of lesser inclination

33. It is necessary to maintain the valve clearances as they

  • reduce the resistance to sliding that occurs between the cam and the tappet
  • allow for lengthening of the valves owing to the heat of combustion
  • increase the speed at which the valves move up and down
  • make the crankshaft turn smoothly

34. It is necessary to maintain the valve clearances as they

  • reduce the resistance to sliding that occurs between the cam and the tappet
  • allow for lengthening of the valves owing to the heat of combustion
  • increase the speed at which the valves move up and down
  • make the crankshaft turn smoothly

35. What type of bearing is used for main bearings and connecting rod bearings ?

  • Ballbearings
  • Plain bearings
  • Needle roller bearing
  • Taper roller bearing

36. What type of bearing is used for main bearings and connecting rod bearings ?

  • Ballbearings
  • Plain bearings
  • Needle roller bearing
  • Taper roller bearing

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

  • Yes
  • No

38. 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.

  • True
  • False

39. The function of a governor in automobiles is to

  • Limit the power
  • Limit the vehicle speed
  • Maintain constant engine speed
  • Maximise the fuel economy

40. The main task of a battery in automobiles is to

  • Supply electricity to the alternator
  • Act as a reservoir or stabilizer of electricity
  • Supply electricity to the vehicle's electrical system at all times while the engine is running
  • Supply a large amount of power to turn the starter motor when the engine is being started

41. When the battery is half (50%) charged, the specific gravity of acid in a battery is usually

  • 0.74
  • 1.00
  • 1.12
  • 1.19

42. Highest useful compression ratio (HUCR) is the highest compression ratio at which the

  • Engine can run
  • Engine gives maximum output
  • Engine is most efficient
  • Fuel can be used in a test engine without knocking

43. A laminated glass upon cracking

  • Bursts into sharp edged fragments
  • Bursts into granular pieces
  • Sandwiched layer traps the fragments
  • Breaks into the form of crystals

44. The self ignition temperature of Diesel as compared to petrol is

  • Higher
  • Lower
  • Same
  • Depends on fuel quality

45. The Diesel engines are also known as

  • Spark ignition (S.I.) engines
  • Compression ignition (I.) engines
  • Steam engines
  • None of these

46. The petrol engines are also known as

  • Spark ignition (S.I.) engines
  • Compression ignition (I.) engines
  • Steam engines
  • None of these

47. A worm gear is used as the pinion for the rack and pinion type of steering gearbox, because it

  • Improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion
  • Allows the steering wheel to be turned by a greater amount when steering
  • Makes the steering more responsive
  • Reduces the amount of kickback for large steering angles

48. The correct way to rectify an imbalanced wheel is to

  • Adjust the tyre pressure
  • Rotate the tyres
  • Adjust the damper spring tension
  • Attach appropriate weights to the wheel at appropriate positions

49. An under-inflated tyre will wear the tread most

  • Near the centre
  • Near the edges
  • In the lateral direction
  • In the cross direction

50. The purpose of a balancer shaft is to

  • Balance the timing in the movement of the two groups of pistons
  • Increase inertia force of the rotating crankshaft
  • Reduce vibrations caused by the crankshaft rotation
  • Adjusts the timing of the intake and exhaust valve openings

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