Automobile Engineering MCQ Solved Paper for GMAT

1. 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

2. 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

3. The major purpose of an electronically controlled automatic transmission is that this type of transmission
A. Eliminates gear clutches
B. Eliminates the gear shaft lever
C. Reduces the number of automatic transmission components
D. Reduces shift shock and achieves more efficient transmission of engine torque
Answer : D

4. The maximum torque multiplication ratio in a torque converter is about
A. 2.5
B. 10
C. 25
D. 40
Answer : A

5. In a four speed four stroke Diesel engine, the intake valve
A. Opens at T.D.C. and closes at B.D.C.
B. Opens at 20° before T.D.C. and closes at 35° after B.D.C.
C. Opens at 10° after T.D.C. and closes at 20° before B.D.C.
D. None of the above
Answer : B

6. The process of supplying the intake air to the engine cylinder at a pressure greater than the pressure of the surrounding atmosphere is known as
A. Supercharging
B. Auto ignition
C. Scavenging
D. Detonation
Answer : A

7. 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

8. 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

9. 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

10. 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

11. The combustion process in a Diesel engine is a
A. Constant volume process
B. Constant pressure process
C. Constant temperature process
D. Adiabatic process
Answer : B

12. The information provided by the oxygen (O?) sensor to the feedback control system is about the
A. Air-fuel ratio
B. Air temperature
C. Air flow speed
D. Exhaust gas volume
Answer : A

13. 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

14. The exhaust gas from petrol engine contains
A. Petrol vapours
B. Water vapours
C. Carbon monoxide
D. All of these
Answer : D

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

16. The tyre rotation is generally done at
A. 1000 km
B. 4000 km
C. 6000 km
D. 10000 km
Answer : D

17. The motion of the cam is transferred to the valves through
A. Pistons
B. Rocker arms
C. Camshaft pulley
D. Valve stems
Answer : B

18. The cetane rating of Diesel fuel is in the order of
A. 25
B. 45
C. 70
D. 90
Answer : B

19. In a Diesel engine, the fuel is ignited by
A. An electric spark
B. The heat of compression
C. The hot exhaust
D. None of these
Answer : B

20. In a petrol engine, the high voltage for spark plug is in the order of
A. 1000 volts
B. 2000 volts
C. 11 kilovolts
D. 22 kilovolts
Answer : D

21. 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

22. 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

23. 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

24. 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

25. The main function of a resonator is that it
A. Regulates the intake air flow rate
B. Reduces the intake air noise
C. Enhances intake efficiency
D. Regulates the intake air temperature
Answer : B

26. 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

27. 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

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

29. The firing order for an opposed four cylinder l.C. engine is
A. 1-2-3-4
B. 1-3-4-2
C. 1-4-3-2
D. 1-3-2-4
Answer : C

30. A petrol engine of a car develops 125 Nm torque at 2700 r.p.m. The car is driven in second gear having gear ratio of 1.75. The final drive ratio is 4.11. If the overall transmission efficiency is 90%, then the torque available at the driving wheels is
A. 8.091 Nm
B. 80.91 Nm
C. 809.1 Nm
D. 8091 Nm
Answer : C

31. 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

32. The function of a governor in automobiles is to
A. Limit the power
B. Limit the vehicle speed
C. Maintain constant engine speed
D. Maximise the fuel economy
Answer : B

33. The device for smoothening out the power impulses from the engine is called
A. Clutch
B. Differential
C. Flywheel
D. Torque converter
Answer : C

34. 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

35. When the brake pedal free play is less than the specified value, then the
A. Brake drags
B. Brake fades
C. Vapour locking occurs in the brake lines
D. Antilock braking system malfunctions
Answer : A

36. Instead of valves, the ports are used in case of
A. Four stroke I.C. engines
B. Two stroke I.C. engines
C. V6 engines
D. None of these
Answer : B

37. The octane rating of petrol commercially available is
A. 85-95
B. 95-100
C. 100-110
D. 110-125
Answer : A

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

39. 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

40. 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

41. Petrol that detonates easily is called
A. High octane petrol
B. Low octane petrol
C. Unleaded petrol
D. Blended fuel
Answer : B

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. The calorific value of petrol is about
A. 36.5-38.5 MJ/kg
B. 39.4-42.5 MJ/kg
C. 42.7-43.5 MJ/kg
D. 45.5-47 MJ/kg
Answer : C

44. 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

45. 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

46. The purpose of a balancer shaft is to
A. Balance the timing in the movement of the two groups of pistons
B. Increase inertia force of the rotating crankshaft
C. Reduce vibrations caused by the crankshaft rotation
D. Adjusts the timing of the intake and exhaust valve openings
Answer : C

47. The fuel that detonates easily, is
A. N-heptane
B. Iso-octane
C. Benzene
D. Alcohol
Answer : A

48. The basic purpose of providing caster angle on wheels is to
A. Prevent uneven tyre wear
B. Maintain directional control
C. Bring the road contact of the tyre under the point of load
D. Compensate for wear in the steering linkage
Answer : B

49. Which one of the following statements correctly describes the construction of a planetary gear type differential?
A. The six planetary pinions rotate in constant mesh with the internal gears.
B. One drive shaft is splined to the central gear and the other to the planetary gear.
C. Each planetary pinion gear meshes with both the central gear and the internal gear.
D. The internal gear is fixed to the planetary gear.
Answer : B

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