Automobile Engineering 1000+ MCQ with answer for NDA

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

2. 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

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

4. 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

5. Odometer is an instrument used for measurement of
A. Power
B. Fuel consumption
C. Engine r.p.m.
D. Distance
Answer : D

6. 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

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

8. 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

9. 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

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

11. 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

12. 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

13. 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

14. 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

15. The forced fed lubrication system means that the oil is delivered to the engine by
A. Gravity
B. The pressure created by the oil pump
C. Splashing action of the crankshaft
D. None of these
Answer : B

16. In a four wheel drive (4WD), the numbers of gear boxes are
A. 1
B. 2
C. 3
D. 4
Answer : B

17. Which of the following oil is more viscous?
A. SAE 30
B. SAE 40
C. SAE 70
D. SAE 80
Answer : D

18. The timing belt is attached to the camshaft pulley and
A. Timing belt drive pulley
B. Distributor
C. Radiator fan pulley
D. Alternator pulley
Answer : A

19. The sequence in which the force is transmitted through a brake system when the brake pedal is depressed is
A. Brake pedal, master cylinder, brake lines, vacuum servo mechanism, brake pads
B. Brake pedal, vacuum servo mechanism, master cylinder, brake lines, brake pads
C. Brake pedal, master cylinder, vacuum servo mechanism, brake lines, brake pads
D. Brake pedal, brake lines, vacuum servo mechanism, master cylinder, brake pads
Answer : B

20. 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

21. The brake pedal during ABS operation
A. Is pushed upward forcefully
B. Pedal stroke becomes longer
C. Transmits slight kickback to the driver's foot
D. All of the above
Answer : C

22. The valve tappet clearance is measured by
A. Screw pitch gauge
B. Engineering scale
C. Feeler gauge
D. Vernier caliper
Answer : C

23. 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

24. A clutch is usually designed to transmit maximum torque which is
A. Equal to the maximum engine torque
B. 80 % of the maximum engine torque
C. 150 % of the maximum engine torque
D. None of these
Answer : C

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

26. 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

27. 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

28. The main characteristics of a maintenance free (MF) battery is that
A. A maintenance free battery requires little maintenance during normal use and it is sufficient to add water instead of an electrolyte containing sulphuric acid
B. A maintenance free battery has a relatively short shelf life when compared with standard batteries
C. Since it is sealed, the water in maintenance free battery is not lost through evaporation thus accordingly it is not necessary to top up the cells with water
D. Recharging of a maintenance free battery is neither required nor possible
Answer : C

29. 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

30. 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

31. An imbalance wheel during vehicle operation
A. Makes large noise when its heavy point hits the road surface
B. Deflects in the vehicle's longitudinal direction
C. Bounces vertically or deflects from side to side (as seen from front or rear)
D. Creates a standing wave
Answer : C

32. A traction control system (TCS) in automobiles controls the
A. Vibrations on the steering wheel
B. Engine power during acceleration
C. Torque that is transmitted by the tyres to the road surface
D. Stopping distance in case of emergency
Answer : C

33. 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

34. The power source for a brake booster is
A. Exhaust manifold pressure
B. Electricity
C. The pressure difference between the atmospheric pressure and the vacuum pressure in the intake manifold
D. Hydraulic pump
Answer : C

35. 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

36. 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

37. A three way catalytic converter
A. Re-circulates exhaust gases
B. Burns fuel vapour gases
C. Reduces N?, H?O, and CO? emission levels
D. Removes CO, HC, and NO? from the exhaust gasses passing through it
Answer : D

38. The main function of the tread pattern on tyre is that
A. The tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating
B. The crests between the tread grooves absorb road noise
C. In wet conditions, the tread grooves expel water that is drawn between the tyre and road surface
D. The tread pattern protects the tyre's inner carcass from small stones and pieces of glass
Answer : C

39. 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

40. The three basic cylinder arrangements for automotive engines are
A. Flat, radial, and V
B. In a row, in line, and opposed
C. In line, V, and opposed
D. V, double row, and opposed
Answer : C

41. 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

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

43. When the battery is half (50%) charged, the specific gravity of acid in a battery is usually
A. 0.74
B. 1.00
C. 1.12
D. 1.19
Answer : D

44. 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

45. 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

46. 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

47. 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

48. 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

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

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