Automobile Engineering 1000+ MCQ with answer for CAT

1. A laminated glass upon cracking
A. Bursts into sharp edged fragments
B. Bursts into granular pieces
C. Sandwiched layer traps the fragments
D. Breaks into the form of crystals
Answer : C

2. 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

3. The effect of having excess camber is
A. Excessive steering alignment torque
B. Hard steering
C. Too much traction
D. Uneven tyre wear
Answer : D

4. 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

5. 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

6. The piston compression rings are made of
A. Cast iron
B. Steel
C. Aluminium
D. Bronze
Answer : A

7. 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

8. In a forced feed lubrication system, the device used to guard against excessive oil pressure, is known as
A. Release chamber
B. Balancer
C. Relief valve
D. Stop valve
Answer : C

9. The basic purpose of tyre rotation on automobiles is to
A. Avoid ply separation
B. Equalize wear
C. Get better ride
D. None of these
Answer : B

10. If the spark plug deposit indicates black coating of soot, it indicates that the engine has been generally operating on
A. Too lean mixture
B. Stoichiometric mixture
C. Most economical mixture
D. Too rich mixture
Answer : D

11. The most effective method of controlling S.I. engine exhaust emission is by
A. Recirculating exhaust
B. Using catalytic converter
C. Using some additives in the fuel
D. None of these
Answer : B

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

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

14. 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

15. The air resistance to a car at 20 kmph is R. The air resistance at 40 kmph will be
A. R
B. 2 R
C. 4R
D. 4 R²
Answer : C

16. The basic part of the engine, to which the other engine parts are attached or assembled is the
A. Cylinder head
B. Crankshaft
C. Cylinder block
D. Oil pan
Answer : C

17. The connecting rods are generally made of ________ shaped crosssection.
A. I
B. C
C. L
D. H
Answer : A

18. 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

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

20. The ignition in a spark ignition engine takes place when the piston is
A. Exactly at the T.D.C. position on its compression stroke
B. Approaching the T.D.C. position on its compression stroke
C. Leaving the T.D.C. position on its compression stroke
D. Approaching the T.D.C position on its exhaust stroke
Answer : B

21. The firing order for an opposed four cylinder l.C. engine is
A. 1-2-3-4
B. 1-3-4-2
C. 1-4-3-2
D. 1-3-2-4
Answer : C

22. 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

23. 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

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

25. 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

26. 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

27. The rating of C.I. engine fuel (Diesel) is given by
A. Octane number
B. Performance number
C. Cetane number
D. None of these
Answer : C

28. During suction stroke, the inside pressure of cylinder is
A. More than the atmospheric pressure
B. Less than the atmospheric pressure
C. Equal to the atmospheric pressure
D. None of these
Answer : B

29. 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

30. 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

31. The crescent shaped cavity on the piston head top surface is called as
A. Piston oil hole
B. Snap ring
C. Valve recess
D. Valve clearance
Answer : C

32. 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

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

34. 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

35. The coefficient of friction for the clutch facing is approximately
A. 0.1
B. 0.4
C. 0.8
D. 1.2
Answer : B

36. The component that connects the steering rack to the knuckles is
A. Tie rod
B. Sector gear
C. Pivot
D. Spline
Answer : A

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

38. 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

39. 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

40. The specific gravity of petrol is about
A. 0.75
B. 0.85
C. 0.95
D. 1.25
Answer : A

41. 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

42. 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

43. If the valve clearances are excessively large, the problem that can arise is
A. Overheating of the engine
B. Incomplete valve closure
C. Fouling of spark plug by gasoline
D. None of these
Answer : B

44. 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

45. The damper fluid leakage typically occur from
A. Upper damper mounting
B. Bottom of damper
C. Clearance between inner and outer tubes of damper
D. Coil spring mounting
Answer : C

46. In bias ply tyres
A. All plies run parallel to one another
B. Belts of steel mesh are used in the tyres
C. One ply layer runs diagonally one way and another layer runs diagonally the other way
D. All of the above
Answer : C

47. 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

48. In a single dry plate clutch, torsional vibrations are absorbed by
A. Coil springs known as torsional springs
B. Cushion springs
C. Central hub
D. Clutch pedal
Answer : A

49. The frequency of flashing of light per minute in a direction (side turn) indicator is about
A. 9
B. 90
C. 900
D. 9000
Answer : B

50. 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