Automobile Engineering 1000+ MCQ with answer for GRE

1. 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

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

3. The problems caused by the wheel imbalance are
A. Hard steering and hard ride
B. Poor acceleration and hard steering
C. Steering wheel vibrations and uneven tyre wear
D. Poor acceleration and reduced fuel efficiency
Answer : C

4. 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

5. The function of a second ring is that it is a
A. Back up compression ring which will work in place of the top ring when it is broken
B. Compression ring and aids the top ring in sealing and cooling
C. Back up oil control ring which will work in place of the bottom ring when it is broken
D. Cushion ring which prevents piston slap and knock
Answer : B

6. The function of antilock brake system (ABS) is that is
A. Reduces the stopping distance
B. Minimises the brake fade
C. Maintains directional control during braking by preventing the wheels from locking
D. Prevents nose dives during braking and thereby postpones locking of the wheels
Answer : C

7. During braking, the brake shoe is moved outward to force the lining against the
A. Wheel piston or cylinder
B. Anchor pin
C. Brake drum
D. Wheel rim or axle
Answer : C

8. 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

9. The function of a connecting rod is
A. To turn the flywheel
B. To drive the drive plate
C. To drive the fuel pump
D. To transmit motion of the piston to the crankshaft
Answer : D

10. A maintenance free battery
A. Has lead-antimony plate grid
B. Has lead-calcium plate grid
C. Does not contain acid
D. Does not contain water
Answer : B

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

12. Cushioning springs in clutch plate reduces
A. Vehicle speed
B. Torsional vibrations
C. Jerky starts
D. None of these
Answer : C

13. In order to implement gear changes in the gear unit of an automatic transmission, a ________ is used.
A. Synchronizer
B. Planetary gear
C. Magnetic clutch
D. Hydraulic multi plate clutch
Answer : D

14. The indicated power of a four stroke engine (in watts) is equal to (where P = Mean effective pressure in N/m², L = Length of stroke in metres, A = Cross-sectional area of the piston in m², and N = Speed of the engine in revolutions per second (r.p.s)
A. P.L.A.N/2
B. P.L.A.N
C. 2 × P.L.A.N
D. P.L.A.N/4
Answer : A

15. Which of the following bulb in a car will have the least wattage?
A. Head light bulb
B. Stop light bulb
C. Parking light bulb
D. Ignition warning bulb
Answer : D

16. The sequence order of events in a four stroke engine is
A. Suction exhaust power compression
B. Suction power compression exhaust
C. Suction compression power exhaust
D. Exhaust compression power suction
Answer : C

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

18. 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

19. The most accurate ignition system of a spark ignition engine is
A. Magneto system
B. Battery system
C. Electronic control unit system
D. Magneto and electronic system
Answer : C

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

21. The natural gas is compressed in a CNG cylinder at a pressure of
A. 200 bar
B. 220 bar
C. 250 bar
D. 300 bar
Answer : A

22. The condition that causes vapour locking in a brake system is
A. Overheating of the fluid due to frequent brake application
B. Overcooling of the brakes during high speed driving
C. Keeping the vehicle without use for an extended period
D. An excessively high engine speed on a downhill road
Answer : A

23. 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

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

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

26. 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

27. 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

28. An underinflated tyre will wear the tread most
A. Near the centre
B. Near the edges
C. In the lateral direction
D. In the cross direction
Answer : B

29. 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

30. 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

31. Bead wires are made of
A. Steel
B. Copper
C. Zinc
D. Aluminium
Answer : A

32. 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

33. 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

34. Which part of the automobile tyre is subjected to greatest flexing action?
A. Bead
B. Side wall
C. Shoulder
D. Tread
Answer : B

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

36. 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

37. The rolling resistance is because of the friction between the
A. Wheel rim and tyre
B. Tyre and the road surface
C. Wheel rim and road surface
D. None of these
Answer : B

38. The component in the radiator of an automobile that increases the boiling point of water is
A. Drain plug
B. Water jacket
C. Vacuum valve
D. Pressure cap
Answer : D

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

40. 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

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

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

43. 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

44. The driveshafts are connected to the differential and wheel hubs through universal joints because the universal joints
A. Absorb the vibrations transferred from the surface of the road
B. Compensate for variations in the relative positions of the differential and the wheels which result from bumpy road surfaces or other similar driving conditions.
C. Absorb any difference in speed between the left and right wheels when the vehicle is turning
D. None of the above
Answer : B

45. 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

46. The starter motor is driven by
A. Chain drive
B. Gear drive
C. Flat belt drive
D. V-belt drive
Answer : B

47. 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

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

49. The condition that results in large quantities of CO emission is
A. Insufficient air during combustion
B. Insufficient fuel during combustion
C. Low temperature combustion
D. High temperature combustion
Answer : A

50. In vehicles with tilt steering, the steering column is pivoted in
A. Upper bracket
B. Lower bracket
C. Tilt bracket
D. Steering yoke joint
Answer : B