Automobile Engineering 1000+ MCQ with answer for SBI Clerk

1. 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

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

3. 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

4. The main function of intake manifold is that it
A. Promotes the mixture of air and fuel
B. Reduces intake noise
C. Cools the intake air to a suitable temperature
D. Distributes intake air equally to the cylinders
Answer : D

5. 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

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

7. 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

8. 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

9. Caster is a
A. Forward tilt of the kingpin
B. Backward tilt of the kingpin
C. Either 'A' or 'B'
D. None of these
Answer : C

10. The function of positive crankcase ventilation (PCV) system is that it
A. Mixes fuel with air
B. Promotes combustion by creating a swirling movement in the air-fuel mixture
C. Returns blow by gases from the crankcase to the intake system
D. Feeds blow by gases to the exhaust manifold
Answer : C

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

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

13. The purpose of turning radius gauges is to measure the
A. Contact areas of the tyres
B. Free plays of the steering wheel
C. Turning radius of the left and right wheels
D. Difference in the toe angles of the left and right wheels
Answer : C

14. In a ventilated disc brake
A. A duct directs air towards the caliper for cooling while the vehicle is moving
B. Caliper is covered with cooling fins
C. Disc contains many small holes for optimum cooling performance
D. Disc contains radial vanes between its rubbing surfaces for optimum cooling performance
Answer : D

15. The correct flow of power through the drive train is
A. Engine drive shafts, clutch, main shaft, counter shaft, final driven gear, wheels
B. Engine clutch, main shaft, counter shaft, final driven gear, drive shafts, wheels
C. Engine clutch, counter shaft, main shaft, final driven gear, drive shafts, wheels
D. Engine main shaft, counter shaft, clutch, final driven gear, drive shafts, wheels
Answer : B

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

17. The engine oil level should be checked
A. Immediately after the ignition switch is turned off
B. While the engine is running
C. A few minutes after the ignition switch is turned off
D. While the engine is running at high idle speed
Answer : C

18. The diagram which shows the correct crank positions corresponding to the opening and closing of the valves, is known as
A. Indicator diagram
B. Axial force diagram
C. Valve timing diagram
D. None of these
Answer : C

19. The component of the oil filter that prevents the passage of metal particles and sludge is
A. Element
B. Relief valve
C. Check valve
D. Case
Answer : A

20. 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

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

22. The mechanical efficiency (?m) of an I.C. engine is equal to (where I.P. = Indicated power, B.P. = Brake power and F.P. = Frictional power)
A. I.P/B.P.
B. B.P/I.P.
C. B.P/F.P.
D. F.P/B.P.
Answer : B

23. 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

24. 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

25. The main cause for the change in engine oil viscosity is
A. Humidity
B. Temperature
C. Vibration
D. Contamination
Answer : B

26. 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

27. When the piston is at T.D.C, the volume above the piston in the combustion chamber is the
A. Clearance volume
B. Cylinder volume
C. Exhaust volume
D. None of these
Answer : A

28. 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

29. 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

30. 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

31. 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

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

33. The coefficient of rolling resistance for a truck weighing 63,500 N is 0.018. The rolling resistance to the truck is
A. 1.143 N
B. 11.43 N
C. 114.3 N
D. 1143 N
Answer : D

34. 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

35. Petrol that detonates easily is called
A. High octane petrol
B. Low octane petrol
C. Unleaded petrol
D. Blended fuel
Answer : B

36. 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

37. When the top of the wheel is tilted outward, then it is called
A. Positive camber
B. Negative camber
C. Positive caster
D. Negative caster
Answer : A

38. 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

39. With the increase of battery temperature, the specific gravity of electrolyte
A. Increases
B. Decreases
C. Remains the same
D. None of these
Answer : B

40. The condition that results in large quantities of CO emission is
A. Insufficient air during combustion
B. Insufficient fuel during combustion
C. Low temperature combustion
D. High temperature combustion
Answer : A

41. 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

42. 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

43. The cetane rating of Diesel fuel is in the order of
A. 25
B. 45
C. 70
D. 90
Answer : B

44. 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

45. 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

46. 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

47. 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

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

49. 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

50. 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