SSC JE - Automobile Engineering 1000+ MCQ [Solved] PDF Download

1. 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

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

3. The negative 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 : B

4. 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

5. An engine has a clearance volume of 100 cm³ and a swept volume of 800 cm³. The compression ratio is
A. 7 : 1
B. 8 : 1
C. 9 : 1
D. 10 : 1
Answer : C

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

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. Free pedal play in car clutches is about
A. 15 mm
B. 25 mm
C. 40mm
D. 60 mm
Answer : B

9. An overinflated tyre will wear the tread most near the
A. Edges
B. Corners
C. Centre
D. None of these
Answer : C

10. The ball joints are used on the tie rod ends, because they
A. Reduce the amount of noise generated
B. Reduce the amount of sliding resistance
C. Can deal with movement of the suspension both vertically and in other directions
D. Improve the force transmission speed
Answer : C

11. 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

12. A four cylinder engine has a capacity of 2.4 litres. The swept volume of one cylinder is
A. 400 cm³
B. 600 cm³
C. 1200 cm³
D. 2400 cm³
Answer : B

13. The aluminium alloy is used in cylinder blocks because
A. It is lighter and has good heat dissipation characteristics
B. Material cost is low
C. It does not require any cylinder liners
D. The piston is also made of aluminium alloy
Answer : A

14. 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

15. In a four cylinder inline engine, the number of firing strokes in one revolution of the crank is
A. 1
B. 2
C. 3
D. 4
Answer : B

16. 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

17. 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

18. 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

19. The rigid suspension is beneficial when
A. It is desired to reduce the unsprung mass
B. It is desired to have more flexibility in design
C. It is desired to improve tyre to ground contact characteristics
D. Large changes in load make it necessary to have a large suspension stroke
Answer : D

20. 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

21. The purpose of transmission in an automobile is
A. To vary the speed of automobile
B. To vary the torque at the wheels
C. To vary the power of automobile
D. None of these
Answer : B

22. 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

23. 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

24. 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

25. The basic purpose of tyres is to
A. Grip the road and provide good traction
B. Substitute for springs
C. Act as brake
D. None of these
Answer : A

26. 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

27. 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

28. The compression ratio in petrol engine is kept less than in Diesel engine because
A. It makes petrol engines lighter
B. Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition
C. Less compression ratio gives better performance
D. It is just customary to have less compression ratio in petrol engines
Answer : B

29. 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

30. The fuel pump in the programmed fuel injection (PFI) system is located
A. Between the fuel filler pipe and fuel tank
B. In the fuel tank
C. On the distributor mounting in the engine compartment
D. On the engine compartment bulkhead
Answer : B

31. The auto ignition in a spark ignition engine means
A. Automatic ignition of the charge at the end of compression
B. Ignition induced by the passage of a spark
C. Ignition of the charge before the passage of flame front
D. Ignition induced to supplement the process of normal combustion
Answer : C

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

33. The cam shaft in an engine is always mounted
A. Parallel to the crankshaft
B. Perpendicular to the crankshaft
C. Inclined to the crankshaft
D. None of these
Answer : A

34. The correct way to rectify an imbalanced wheel is to
A. Adjust the tyre pressure
B. Rotate the tyres
C. Adjust the damper spring tension
D. Attach appropriate weights to the wheel at appropriate positions
Answer : D

35. The firing order for an inline four cylinder I.C. engine is
A. 1-2-3-4
B. 1-3-4-2
C. 1-2-4-3
D. 1-3-2-4
Answer : B

36. 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

37. 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

38. 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

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

40. The vehicle ride will be comfortable if
A. Unsprung mass is kept minimum
B. Sprang mass is kept minimum
C. Vehicle mass is kept minimum
D. All of these
Answer : A

41. 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

42. 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

43. The specific gravity of acid in a fully charged battery is generally
A. 1.00
B. 1.28
C. 1.82
D. 2.81
Answer : B

44. The lower cylindrical portion of the piston which improves piston cooling performance is called
A. Piston crown
B. Connecting rod
C. Piston pin boss
D. Piston skirt
Answer : D

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

46. 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

47. Damper in an automobile is used to
A. Absorb the energy
B. Dissipate the energy
C. Release the energy
D. Increase the energy
Answer : B

48. 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

49. Which of the following indicates multigrade oil?
A. SAE 30
B. API SF
C. SAE 20 W50
D. API 50
Answer : C

50. 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