1000+ Automobile Engineering Multiple Choice Question Answer [Solved]

1. 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

2. Free pedal play in car clutches is about
A. 15 mm
B. 25 mm
C. 40mm
D. 60 mm
Answer : B

3. 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

4. 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

5. 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

6. If the engine coolant leaks into the engine oil, then engine oil
A. Appears milky
B. Become foamy
C. Turns black
D. None of these
Answer : A

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

8. The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to
A. Enable the pump's fault diagnosis function to operate
B. Warm up and lubricate the pump
C. Supplies a large amount of fuel and thereby creates a choke effect
D. Pressurise the fuel system before the engine is started
Answer : D

9. 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

10. 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

11. The valve overlap in four stroke petrol engines is approximately
A. 30°
B. 60°
C. 90°
D. 120°
Answer : A

12. 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

13. 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

14. 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

15. In Diesel engines, during suction stroke, ________ is drawn in the cylinder.
A. Air and fuel
B. Only fuel
C. Only air
D. None of these
Answer : C

16. 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

17. 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

18. Highest useful compression ratio (HUCR) is the highest compression ratio at which the
A. Engine can run
B. Engine gives maximum output
C. Engine is most efficient
D. Fuel can be used in a test engine without knocking
Answer : D

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

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

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

22. 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

23. 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

24. The antiknock property of compression ignition engine fuel can be improved by adding
A. Tetraethyl lead
B. Trimethyl pentane
C. Amyl nitrate
D. Hexadecane
Answer : C

25. The compression ratio for Diesel engines usually lies in the range of
A. 6-10
B. 10-1
C. 15-25
D. 25-40
Answer : C

26. The starter motor is driven by
A. Chain drive
B. Gear drive
C. Flat belt drive
D. V-belt drive
Answer : B

27. 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

28. 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

29. 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

30. 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

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

32. The heat transfer from coolant to air in the radiator of an automobile engine takes place by
A. Radiation only
B. Convention only
C. Convection and radiation
D. Conduction, convection and radiation
Answer : C

33. The size of engine cylinder is referred in terms of its
A. Diameter and bore
B. Displacement and efficiency
C. Bore and stroke
D. Bore and length
Answer : C

34. 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

35. The cetane number of a Diesel fuel is a measure of
A. Volatility
B. Viscosity
C. Ignition quality
D. Delay period
Answer : D

36. The basic purpose of providing caster angle on wheels is to
A. Prevent uneven tyre wear
B. Maintain directional control
C. Bring the road contact of the tyre under the point of load
D. Compensate for wear in the steering linkage
Answer : B

37. The ball joints are used on the tie rod ends, because they
A. Reduce the amount of noise generated
B. Reduce the amount of sliding resistance
C. Can deal with movement of the suspension both vertically and in other directions
D. Improve the force transmission speed
Answer : C

38. 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

39. The gradient resistance to a vehicle having a mass of 980 kg moving on an incline of 10° is
A. 1.6694 N
B. 16.694 N
C. 166.94 N
D. 1669.4 N
Answer : D

40. 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

41. 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

42. 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

43. 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

44. 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

45. In order to implement gear changes in the gear unit of an automatic transmission, a ________ is used.
A. Synchronizer
B. Planetary gear
C. Magnetic clutch
D. Hydraulic multi plate clutch
Answer : D

46. Incorrect steering axis inclination (S.A.I.) causes
A. Tendency to assume toe-out orientation
B. Generation of a braking effect at tight corners
C. Poor recovery of the steering wheel after making a turn
D. The vehicle to pull to the side of lesser inclination
Answer : C

47. 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

48. 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

49. The main purpose of an engine's air cleaner is that it
A. Controls the engine's air intake volume
B. Reduces the engine's air intake noise
C. Prevents rain water from entering the engine
D. Prevents dust and other foreign matter from entering the engine
Answer : D

50. 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