1000+ Automobile Engineering Multiple Choice Question Answer [Solved]

1. 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

2. 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

3. 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

4. The function of a radiator fan in the cooling system is that
A. It blows air through the radiator when necessary
B. It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump
C. It cools the engine by blowing air onto the cylinder block
D. It draws heat out of the engine compartment
Answer : A

5. Damper is also known as
A. Shock absorber
B. Torsion bar
C. Spring
D. Radius rod
Answer : A

6. 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

7. 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

8. 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

9. The advantage of having a tandem master cylinder arrangement in automobiles is that it
A. Enhances safety by serving two independent lines in a divided line brake circuit
B. Enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss
C. Supplies equal fluid pressure to each line of a divided line brake circuit, thereby preventing the brakes from dragging on one side
D. Boosts the brake fluid pressure to reduce the force required to depress the brake pedal
Answer : A

10. The purpose of a thermostat in an engine cooling system is to
A. Prevent the coolant from boiling
B. Allow the engine to warm up quickly
C. Indicate the coolant temperature
D. Pressurise the system to raise the boiling point
Answer : B

11. The device for smoothening out the power impulses from the engine is called
A. Clutch
B. Differential
C. Flywheel
D. Torque converter
Answer : C

12. 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

13. 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

14. The engine oil is stored in __________ when the engine is not running.
A. Oil pan
B. Cylinder head
C. Oil pump
D. Separate oil tank
Answer : A

15. Which of the following is not an automobile?
A. Motor cycle
B. Passenger car
C. Aeroplane
D. Truck
Answer : C

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

17. In a four stroke engine for each crankshaft revolution, the camshaft revolves
A. One half turn
B. One turn
C. Two turns
D. Four turns
Answer : A

18. 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

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

20. 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

21. 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

22. In vehicles with tilt steering, the steering column is pivoted in
A. Upper bracket
B. Lower bracket
C. Tilt bracket
D. Steering yoke joint
Answer : B

23. 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

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

25. 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

26. The process of removing the burnt gases from the engine cylinder by the fresh charge coming into the engine cylinder from the crankcase, is known as
A. Cleaning
B. Priming
C. Scavenging
D. Detonation
Answer : C

27. 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

28. In a square type engine
A. Geometrical shape is square
B. Diameter and length of piston are same
C. Two cylinders are placed horizontal and two vertical
D. Stroke length and cylinder bore are same
Answer : D

29. 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

30. Clutch facings are usually attached to the plate by
A. Steel rivets
B. Brass rivets
C. Aluminium screws
D. Steel screws
Answer : B

31. What type of bearing is used for main bearings and connecting rod bearings?
A. Ball bearings
B. Plain bearings
C. Needle roller bearing
D. Taper roller bearing
Answer : B

32. 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

33. The oil pump is driven by the
A. Camshaft
B. Alternator shaft
C. Crankshaft via drive belt
D. Crankshaft directly
Answer : D

34. 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

35. 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

36. The tilting of the front wheels away from the vertical, when viewed from the front of the car, is called
A. Camber
B. Caster
C. Toe in
D. Toe out
Answer : A

37. 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

38. 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

39. The specific gravity of Diesel is about
A. 0.65
B. 0.75
C. 0.85
D. 0.95
Answer : C

40. During braking, the brake shoe is moved outward to force the lining against the
A. Wheel piston or cylinder
B. Anchor pin
C. Brake drum
D. Wheel rim or axle
Answer : C

41. 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

42. The connecting rod lower end is connected to the relevant ________ of crankshaft.
A. Big end
B. Crank arm
C. Journal
D. Small end
Answer : C

43. When turning a corner
A. The front wheels are toeing out
B. The front wheels are turning on different angles
C. The inside front wheels has a greater angle than the outside wheel
D. All of the above
Answer : D

44. 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

45. The function of an alternator in an automobile is to
A. Supply electric power
B. Converts mechanical energy into electrical energy
C. Continually recharges the battery
D. Partly converts engine power into electric power
Answer : C

46. 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

47. 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

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

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

50. In a Diesel engine, the fuel is ignited by
A. An electric spark
B. The heat of compression
C. The hot exhaust
D. None of these
Answer : B