1000+ Automobile Engineering MCQ for SSC JHT [Solved]

1. 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

2. Valve overlap is the number of degrees of camshaft rotation during which
A. Both valves are closed
B. Both valves are open
C. Both 'A' and 'B'
D. None of these
Answer : B

3. The parking brake generally acts on
A. Front wheels
B. Rear wheels
C. Front and rear wheels
D. Propeller shaft
Answer : B

4. The commonly used antifreeze solution in automobiles is
A. Carbon disulphide
B. Ethylene glycol
C. Ammonium chloride
D. Freon-12
Answer : B

5. 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

6. 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

7. In a hydraulic power steering system, the power steering pump is driven by a
A. Belt driven by camshaft
B. Chain driven by crankshaft
C. Belt driven by driveshaft
D. Belt driven by crankshaft
Answer : D

8. 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

9. 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

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

11. Which of the following is not a part of the chassis?
A. Wheels
B. Front axle
C. Steering system
D. Seats
Answer : D

12. 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

13. 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

14. The stroke of an engine is the
A. Volume of the cylinder
B. Length of the connecting rod
C. Internal diameter of the cylinder
D. Distance between T.D.C. and B.D.C.
Answer : D

15. The Diesel engines as compared to petrol engines require
A. Bigger flywheel
B. Smaller flywheel
C. Same size of flywheel
D. No flywheel
Answer : A

16. The included angle is the sum of the
A. Camber and castor
B. Castor and S.A.I.
C. Camber and S.A.I.
D. Camber and toe in
Answer : C

17. 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

18. In Spark Ignition Engine
A. Only air is introduced into the cylinder
B. The mixture of air and fuel is introduced into the cylinder from carburettor
C. Both A and B
D. None of these
Answer : B

19. 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

20. 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

21. 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

22. The ease with which petrol vaporizes is called its
A. Oxidation
B. Octane number
C. Volatility
D. Cetane number
Answer : C

23. A heat treated glass generally used in automobiles bursts into ________ upon cracking,
A. Sharp edged fragments
B. Small particles
C. Large particles
D. None of these
Answer : B

24. 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

25. 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

26. In radial tyres
A. One ply layer runs diagonally one way and another layer runs diagonally the other way
B. All plies run parallel to one another and vertical to tyre bead
C. Inner tubes are always used
D. None of these
Answer : B

27. The antiknock property of compression ignition engine fuel can be improved by adding
A. Tetraethyl lead
B. Trimethyl pentane
C. Amyl nitrate
D. Hexadecane
Answer : C

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

29. 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

30. 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

31. The process of removing the burnt gases from the engine cylinder by the fresh charge coming into the engine cylinder from the crankcase, is known as
A. Cleaning
B. Priming
C. Scavenging
D. Detonation
Answer : C

32. 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

33. The connecting rod lower end is connected to the relevant ________ of crankshaft.
A. Big end
B. Crank arm
C. Journal
D. Small end
Answer : C

34. 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

35. The two kinds of piston rings are
A. Compression and oil control rings
B. Compression and sliding seal rings
C. Oil scrapper and oil control rings
D. Pressure and sealing rings
Answer : A

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

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

38. The crankcase dilution means
A. Dilution of fuel in the crankcase
B. Dilution of oil by water in the crankcase
C. Dilution of lubrication oil by fuel in the crankcase
D. Dilution of mixture passing through crankcase in two stroke engines
Answer : C

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

40. 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

41. 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

42. 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

43. 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

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

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

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

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

48. 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

49. The temperature at which tyre inflation pressure should be checked is
A. 20°C
B. 25°C
C. 35°C
D. Ambient temperature
Answer : D

50. The boiling point of Diesel fuel is in the range of
A. 70°C to 100°C
B. 100°C to 120°C
C. 120°C to 180°C
D. 180°C to 360 °C
Answer : D