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

1. The most commonly used power plant in automobiles is
A. Gas turbine
B. I.C. engine
C. Battery
D. None of these
Answer : B

2. The basic purpose of a four wheel drive (4WD) system is that it
A. Delivers improved cornering on dry road surfaces
B. Eliminates the need of snow tyres, tyre chains, etc.
C. Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces
D. Ensures that effective braking can be performed, even on slippery surfaces
Answer : C

3. 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

4. A front stabilizer bar is used to
A. Increase vehicle load carrying capacity
B. Provide a softer ride
C. Control suspension movement and body roll
D. All of the above
Answer : C

5. The torque available at the contact between driving wheels and road is known as
A. Brake effort
B. Tractive effort
C. Clutch effort
D. None of these
Answer : B

6. 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

7. In automobiles G.V.W. refers to
A. Gross vehicle width
B. Gross vehicle weight
C. Gross vehicle wheel base
D. Gross vehicle wheel track
Answer : B

8. 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

9. The battery is an electrochemical device, which means battery
A. Makes chemicals by mechanical means
B. Uses chemical action to provide electricity
C. Has curved plates instead of flat plates
D. Does not use an electrolyte
Answer : B

10. The difference between DOT 3 and DOT 4 brake fluids is
A. DOT 4 fluids have a higher boiling point than DOT 3 fluid
B. DOT 4 fluids have a lower boiling point than DOT 3 fluid
C. DOT 3 and DOT 4 fluids have the same boiling point, but DOT 4 fluid has a longer service life
D. DOT 4 fluid is more resistant to freezing than DOT 3 fluid
Answer : A

11. Thinner is added to the paint in order to
A. Make pigments and resin mix easily
B. Make paint film hard
C. Optimise its viscosity
D. None of these
Answer : C

12. The seat belt tensioners are built in the
A. Front seats
B. Shoulder anchors
C. Seat belt retractors
D. Seat belt buckles
Answer : C

13. 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

14. The crankshaft of a typical inline four cylinder engine has ________ balance weights.
A. 12
B. 4
C. 16
D. 8
Answer : D

15. 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

16. 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

17. 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

18. 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

19. 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

20. 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

21. In case of a Diesel car, the pressure at the end of compression is of the order of
A. 15 bar
B. 25 bar
C. 35 bar
D. 45 bar
Answer : D

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

23. 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

24. 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

25. 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

26. 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

27. The air gap between the central electrode and ground (or side) electrode of a spark plug is around
A. 0.2 mm
B. 0.5 mm
C. 1 mm
D. 1.5 mm
Answer : C

28. 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

29. The function of an alternator in an automobile is to
A. Supply electric power
B. Converts mechanical energy into electrical energy
C. Continually recharges the battery
D. Partly converts engine power into electric power
Answer : C

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

31. 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

32. A battery can be charged by
A. Adding distilled water
B. Adding sulphuric acid
C. Applying voltage in the reverse direction to that of charging
D. Applying a voltage in the same direction to that of charging
Answer : C

33. 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

34. 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

35. 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

36. The basic function of the suspension is to
A. Absorbs vibration and impact forces from the road surface
B. Ensure that the steering wheel can deliver a suitable amount of steering force
C. Ensure that wheel alignment is not disturbed during driving
D. Automatically correct the effects of over steering
Answer : A

37. The power actually developed inside the engine cylinder is called as
A. Indicated power
B. Brake power
C. Frictional power
D. None of these
Answer : A

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

39. 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

40. 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

41. The operation of removing trapped air from the hydraulic braking system is known as
A. Trapping
B. Tapping
C. Bleeding
D. Cleaning
Answer : C

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

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

44. 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

45. The main function of an exhaust muffler is the
A. Optimisation of exhaust efficiency
B. Reduction of exhaust noise
C. Reduction of nitrogen oxide in the exhaust gases
D. Reduction of the exhaust gas volume
Answer : B

46. The composition of the electrolyte in a fully charged battery is that
A. The electrolyte is pure distilled water
B. The electrolyte is pure sulphuric acid
C. The electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight
D. The electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight
Answer : C

47. 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

48. Two general types of tyres are
A. Tube type and tubeless
B. Solid and tubeless
C. Air and pneumatic
D. Split rim and drop centre
Answer : A

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

50. 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