Automobile Engineering MCQ Solved Paper for LSAT

1. 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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. In an engine, the temperature of the piston will be more at the
A. Crown of the piston
B. Skirt of the piston
C. Piston walls
D. Piston rings
Answer : A

9. 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

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

11. The brake warning light warns the driver of
A. Water in the master cylinder
B. Air in the hydraulic system
C. Failure of the primary or secondary circuit of hydraulic system
D. Power brake failure
Answer : C

12. 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

13. 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

14. The combustion process in a Diesel engine is a
A. Constant volume process
B. Constant pressure process
C. Constant temperature process
D. Adiabatic process
Answer : B

15. 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

16. The petrol engines are also known as
A. Spark ignition (S.I.) engines
B. Compression ignition (C.I.) engines
C. Steam engines
D. None of these
Answer : A

17. A worm gear is used as the pinion for the rack and pinion type of steering gearbox, because it
A. Improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion
B. Allows the steering wheel to be turned by a greater amount when steering
C. Makes the steering more responsive
D. Reduces the amount of kickback for large steering angles
Answer : A

18. The discharged lead acid battery has on its plates
A. Lead peroxide (PbO?)
B. Spongy lead (Pb)
C. Lead sulphate (PbSO?)
D. Sulphuric acid (H?SO?)
Answer : C

19. 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

20. 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

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

22. 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

23. 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

24. 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

25. The camshaft of a four stroke Diesel engine running at 1000 rpm will run at
A. 500 rpm
B. 1000 rpm
C. 2000 rpm
D. 4000 rpm
Answer : A

26. In a Diesel engine, the function of a fuel injector is to
A. Mix the fuel and air
B. Ignite the air-fuel mixture
C. Provide flame front for ignition
D. Spray atomized fuel in the cylinder
Answer : D

27. In comparison with a radial tyre, one advantage of a bias ply tyre is
A. Longer life
B. Lower rolling resistance
C. Smoother ride at low speeds
D. None of these
Answer : C

28. 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

29. 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

30. 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

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

32. 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

33. 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

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

35. 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

36. The natural gas is compressed in a CNG cylinder at a pressure of
A. 200 bar
B. 220 bar
C. 250 bar
D. 300 bar
Answer : A

37. Vulcanizing means
A. Heating rubber under pressure
B. Spraying with special paint
C. Melting rubber while stirring it
D. None of these
Answer : A

38. 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

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

40. The exhaust gas from petrol engine contains
A. Petrol vapours
B. Water vapours
C. Carbon monoxide
D. All of these
Answer : D

41. The characteristic that is enhanced by the honing of cylinder sleeves inner surface is
A. Cooling efficiency
B. Resistance to wear
C. Lubrication performance
D. None of these
Answer : C

42. Which one of the following statement correctly describes the construction of a bevel gear type differential?
A. The drive shafts are splined to the differential carrier.
B. The left side gear and the differential carrier rotate in constant unison.
C. The differential carrier houses differential pinion gears and side gears; each pinion gear meshes with a different side gear.
D. The differential carrier houses differential pinion gears and side gears
Answer : D

43. Instead of valves, the ports are used in case of
A. Four stroke I.C. engines
B. Two stroke I.C. engines
C. V6 engines
D. None of these
Answer : B

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

45. The sequence order of events in a four stroke engine is
A. Suction exhaust power compression
B. Suction power compression exhaust
C. Suction compression power exhaust
D. Exhaust compression power suction
Answer : C

46. 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

47. The main function of the brake fluid is
A. Lubrication
B. Power transmission
C. Cooling
D. None of these
Answer : B

48. If clearance volume of I.C. engines is increased, the compression ratio will
A. Increase
B. Decrease
C. Remain constant
D. Be doubled
Answer : B

49. Which of the following symptom is caused as a result of brake disc run out?
A. Ineffectiveness of the brakes
B. Judder during braking
C. Localized wearing of the brake pads
D. Rapid wearing of the brake pads
Answer : B

50. When a gear box has four forward speeds and one reverse speed, it is said to be a
A. 3-speed gear box
B. 4-speed gear box
C. 5-speed gear box
D. 6-speed gear box
Answer : B