1. What is the main function of an engine in a vehicle?

A) Store fuel
B) Convert fuel into mechanical energy
C) Reduce speed
D) Increase vehicle weight
Answer: B
Explanation: The engine converts fuel’s chemical energy into mechanical energy to move the vehicle.

2. Which type of engine is commonly used in motor vehicles?

A) Steam engine
B) Petrol engine
C) Hydraulic engine
D) Solar engine
Answer: B
Explanation: Petrol engines are widely used for light vehicles due to their efficiency and power.

3. What does ‘CC’ in engine capacity stand for?

A) Cubic Centimeter
B) Cylinder Capacity
C) Compression Chamber
D) Combustion Cycle
Answer: A
Explanation: CC measures the engine cylinder volume, indicating engine size.

4. Which component ignites the fuel-air mixture in a petrol engine?

A) Spark plug
B) Fuel injector
C) Piston
D) Carburetor
Answer: A
Explanation: Spark plugs produce a spark to ignite the air-fuel mixture.

5. What is the purpose of a clutch in a vehicle?

A) Control steering
B) Connect and disconnect engine from transmission
C) Reduce fuel consumption
D) Increase engine power
Answer: B
Explanation: The clutch allows smooth engagement/disengagement of power from the engine to the transmission.

6. Which gear is used for maximum speed in manual transmission?

A) 1st gear
B) 2nd gear
C) 3rd gear
D) Top gear
Answer: D
Explanation: Top gear allows maximum speed with minimum engine RPM.

7. What is the main purpose of a radiator in a vehicle?

A) Store coolant
B) Cool the engine
C) Lubricate engine parts
D) Reduce fuel consumption
Answer: B
Explanation: Radiator dissipates heat from the engine coolant to prevent overheating.

**8. Which type of brake is commonly used in heavy vehicles?

A) Disc brake
B) Drum brake
C) Air brake
D) Hydraulic brake
Answer: C
Explanation: Air brakes are used in heavy vehicles for higher braking efficiency.

9. What is the function of a carburetor in a petrol engine?

A) Mix air and fuel
B) Cool the engine
C) Lubricate the piston
D) Start the engine
Answer: A
Explanation: Carburetor mixes fuel and air in the correct ratio for combustion.

10. Which tool is used to measure engine compression?

A) Torque wrench
B) Compression gauge
C) Caliper
D) Vernier scale
Answer: B
Explanation: Compression gauge measures cylinder pressure to check engine health.

11. What is the function of a fuel injector in a diesel engine?

A) Mix air and fuel
B) Deliver fuel to combustion chamber
C) Cool the engine
D) Control exhaust
Answer: B
Explanation: Fuel injectors precisely spray diesel into the combustion chamber for efficient burning.

12. Which part of the engine moves up and down inside the cylinder?

A) Piston
B) Crankshaft
C) Camshaft
D) Spark plug
Answer: A
Explanation: Pistons reciprocate inside the cylinder to compress air-fuel mixture and transfer force.

13. Which system provides power to turn the wheels?

A) Steering system
B) Suspension system
C) Transmission system
D) Cooling system
Answer: C
Explanation: Transmission transfers engine power to the drive wheels.

14. What type of oil is commonly used for engine lubrication?

A) Hydraulic oil
B) Mineral or synthetic engine oil
C) Gear oil
D) Transmission oil
Answer: B
Explanation: Engine oil lubricates moving parts, reduces friction, and prevents wear.

15. Which component stores energy in a battery?

A) Lead plates and electrolyte
B) Fuel injector
C) Radiator
D) Spark plug
Answer: A
Explanation: Lead plates and electrolyte store chemical energy, which is converted to electrical energy.

16. Which component regulates engine speed by controlling fuel supply?

A) Carburetor
B) Throttle
C) Clutch
D) Radiator
Answer: B
Explanation: The throttle controls the amount of air entering the engine, thus regulating speed.

17. What is the function of the exhaust system?

A) Deliver fuel
B) Reduce engine noise and emissions
C) Cool the engine
D) Lubricate engine
Answer: B
Explanation: The exhaust system removes combustion gases and reduces noise.

18. Which type of suspension is commonly used in heavy vehicles?

A) Leaf spring
B) Coil spring
C) Air suspension
D) Torsion bar
Answer: A
Explanation: Leaf springs are robust and support heavy loads efficiently.

19. Which tool is used to tighten bolts to a specific torque?

A) Spanner
B) Screwdriver
C) Torque wrench
D) Pliers
Answer: C
Explanation: Torque wrenches apply precise torque to prevent over-tightening.

20. What is the purpose of a differential in a vehicle?

A) Increase engine power
B) Allow wheels to rotate at different speeds
C) Control steering
D) Reduce fuel consumption
Answer: B
Explanation: The differential allows outer and inner wheels to rotate at different speeds during turns.

21. What does a camshaft do in an engine?

A) Turns the wheels
B) Opens and closes valves
C) Ignites fuel
D) Lubricates engine
Answer: B
Explanation: The camshaft controls the timing of opening and closing of intake and exhaust valves.

22. Which part converts reciprocating motion into rotary motion?

A) Piston
B) Crankshaft
C) Camshaft
D) Flywheel
Answer: B
Explanation: The crankshaft converts the up-and-down motion of pistons into rotational motion.

23. What is the primary purpose of a flywheel?

A) Reduce engine noise
B) Store rotational energy
C) Lubricate engine
D) Control braking
Answer: B
Explanation: The flywheel stores energy to smooth out the engine’s rotational speed.

24. Which type of ignition system is commonly used in petrol engines?

A) Compression ignition
B) Spark ignition
C) Electric injection
D) Diesel ignition
Answer: B
Explanation: Spark ignition uses a spark plug to ignite the air-fuel mixture.

25. What is the purpose of a muffler?

A) Reduce engine vibrations
B) Reduce exhaust noise
C) Increase fuel efficiency
D) Cool the engine
Answer: B
Explanation: The muffler reduces the noise produced by exhaust gases.

26. Which system is responsible for vehicle steering?

A) Transmission system
B) Steering system
C) Brake system
D) Suspension system
Answer: B
Explanation: The steering system allows the driver to control vehicle direction.

27. What is the function of a thermostat in an engine?

A) Control air intake
B) Regulate engine temperature
C) Lubricate engine
D) Control fuel supply
Answer: B
Explanation: The thermostat controls coolant flow to maintain optimal engine temperature.

28. Which brake type uses hydraulic pressure?

A) Air brake
B) Drum brake
C) Disc brake
D) Band brake
Answer: C
Explanation: Hydraulic disc brakes use fluid pressure to apply force on brake pads.

29. What is the role of a radiator cap?

A) Release pressure and maintain coolant system pressure
B) Mix coolant and fuel
C) Lubricate engine
D) Start the engine
Answer: A
Explanation: The radiator cap maintains system pressure and allows excess coolant to escape.

30. Which device measures engine speed?

A) Odometer
B) Tachometer
C) Speedometer
D) Fuel gauge
Answer: B
Explanation: A tachometer measures engine RPM.

31. What is the function of a starter motor?

A) Start the engine
B) Generate electricity
C) Lubricate engine
D) Control brakes
Answer: A
Explanation: Starter motor cranks the engine to begin combustion.

32. Which type of lubrication is commonly used in engines?

A) Grease lubrication
B) Oil lubrication
C) Air lubrication
D) Water lubrication
Answer: B
Explanation: Engine oil reduces friction, wear, and cools engine parts.

33. What does a differential do?

A) Increases fuel efficiency
B) Allows wheels to rotate at different speeds
C) Reduces engine noise
D) Controls braking
Answer: B
Explanation: The differential allows smooth turning by varying wheel speeds.

34. Which part of a diesel engine compresses air before fuel injection?

A) Piston
B) Spark plug
C) Camshaft
D) Flywheel
Answer: A
Explanation: The piston compresses air, increasing temperature for diesel ignition.

35. What is the function of an alternator?

A) Start the engine
B) Generate electricity
C) Measure fuel level
D) Control braking
Answer: B
Explanation: Alternator converts mechanical energy into electrical energy to charge the battery.

36. Which type of suspension provides better comfort?

A) Leaf spring
B) Coil spring
C) Torsion bar
D) Rigid axle
Answer: B
Explanation: Coil springs absorb shocks better, improving ride comfort.

37. What is the purpose of a fuel pump?

A) Mix fuel and air
B) Deliver fuel from tank to engine
C) Cool the engine
D) Control exhaust
Answer: B
Explanation: Fuel pumps supply fuel under pressure to the engine.

38. Which part controls the opening and closing of valves?

A) Camshaft
B) Crankshaft
C) Piston
D) Flywheel
Answer: A
Explanation: Camshaft pushes on valves to regulate air-fuel intake and exhaust flow.

39. Which type of vehicle brake uses compressed air?

A) Disc brake
B) Drum brake
C) Air brake
D) Hydraulic brake
Answer: C
Explanation: Air brakes use compressed air to apply brake force, commonly in trucks and buses.

40. What is the purpose of a torque converter in an automatic transmission?

A) Connect and disconnect engine from transmission
B) Multiply torque and transfer engine power
C) Measure speed
D) Lubricate transmission
Answer: B
Explanation: Torque converters transfer engine torque to transmission fluid for smooth automatic operation.

41. What is the function of a brake master cylinder?

A) Control engine speed
B) Convert pedal force into hydraulic pressure
C) Store brake fluid
D) Control suspension
Answer: B
Explanation: The master cylinder converts the driver’s pedal force into hydraulic pressure for the braking system.

42. Which type of clutch is commonly used in motorcycles?

A) Single plate
B) Multi-plate
C) Hydraulic
D) Centrifugal
Answer: B
Explanation: Multi-plate clutches provide more friction area in compact spaces like motorcycles.

43. What is the function of a spark plug gap?

A) Control fuel flow
B) Determine spark strength and timing
C) Lubricate engine
D) Measure temperature
Answer: B
Explanation: Correct gap ensures proper ignition of the air-fuel mixture.

44. Which type of engine uses compression ignition?

A) Petrol engine
B) Diesel engine
C) Gas engine
D) Electric engine
Answer: B
Explanation: Diesel engines ignite fuel by compressing air to high temperature.

45. What is the purpose of a timing belt?

A) Transmit power to wheels
B) Synchronize camshaft and crankshaft
C) Cool the engine
D) Reduce vibration
Answer: B
Explanation: The timing belt ensures valves open/close in sync with piston movement.

46. Which tool is used to measure engine oil level?

A) Dipstick
B) Vernier caliper
C) Torque wrench
D) Pressure gauge
Answer: A
Explanation: Dipstick is inserted in the oil reservoir to check oil level.

47. What is the purpose of a fuel filter?

A) Remove impurities from fuel
B) Increase fuel pressure
C) Cool the fuel
D) Mix fuel with air
Answer: A
Explanation: Fuel filters prevent dirt and debris from entering the engine.

48. Which system controls vehicle direction?

A) Steering system
B) Transmission system
C) Brake system
D) Suspension system
Answer: A
Explanation: Steering system allows the driver to guide the vehicle.

49. What is the main function of a shock absorber?

A) Reduce engine noise
B) Absorb suspension shocks
C) Lubricate suspension
D) Increase speed
Answer: B
Explanation: Shock absorbers dampen vibrations and maintain vehicle stability.

50. Which part of the vehicle stores coolant?

A) Radiator
B) Coolant reservoir
C) Engine block
D) Fuel tank
Answer: B
Explanation: Coolant reservoir stores excess coolant and supplies it to the radiator as needed.

51. What is the purpose of a cam follower? 

A) Transmit motion from cam to valve
B) Start the engine
C) Measure fuel level
D) Control brakes
Answer: A
Explanation: Cam followers transfer motion from the camshaft to open or close valves.

52. Which system reduces harmful emissions from the engine? 

A) Cooling system
B) Exhaust system
C) Emission control system
D) Fuel system
Answer: C
Explanation: Emission control systems include catalytic converters and sensors to reduce pollutants.

53. What is the function of a fuel injector nozzle? 

A) Store fuel
B) Spray fuel into combustion chamber
C) Mix fuel with coolant
D) Control air intake
Answer: B
Explanation: Nozzles atomize fuel for efficient combustion.

54. Which type of engine uses spark plugs? 

A) Diesel engine
B) Petrol engine
C) Electric engine
D) Gas turbine
Answer: B
Explanation: Petrol engines use spark plugs to ignite the air-fuel mixture.

55. What is the purpose of a radiator fan? 

A) Cool the engine
B) Lubricate the radiator
C) Measure coolant level
D) Increase fuel flow
Answer: A
Explanation: Radiator fans enhance airflow through the radiator to dissipate heat.

56. What is the function of an oil pump in an engine? 

A) Cool the engine
B) Circulate engine oil
C) Start the engine
D) Increase fuel efficiency
Answer: B
Explanation: Oil pumps supply pressurized oil to engine parts for lubrication.

57. Which component absorbs vibration from the engine? 

A) Flywheel
B) Engine mount
C) Clutch
D) Carburetor
Answer: B
Explanation: Engine mounts reduce vibration transmitted to the vehicle frame.

58. Which part regulates fuel-air mixture in a carburetor? 

A) Throttle valve
B) Spark plug
C) Fuel injector
D) Radiator
Answer: A
Explanation: Throttle valve controls the amount of mixture entering the engine.

59. What is the purpose of a glow plug in a diesel engine? 

A) Cool the engine
B) Preheat combustion chamber for starting
C) Measure fuel level
D) Control brakes
Answer: B
Explanation: Glow plugs preheat the combustion chamber to aid cold starting.

60. Which component increases engine efficiency by reducing friction? 

A) Bearings
B) Pistons
C) Clutch
D) Radiator
Answer: A
Explanation: Bearings reduce friction between moving parts.

61. What does a tachometer indicate? 

A) Vehicle speed
B) Engine RPM
C) Fuel consumption
D) Oil pressure
Answer: B
Explanation: Tachometer measures engine revolutions per minute.

62. Which part converts electrical energy to mechanical energy in a starter motor? 

A) Solenoid
B) Armature
C) Brush
D) Rotor
Answer: B
Explanation: The armature rotates when electrical current flows, starting the engine.

63. What is the function of a crankcase ventilation system? 

A) Increase engine power
B) Remove gases from crankcase
C) Cool the engine
D) Control fuel flow
Answer: B
Explanation: It prevents pressure build-up and directs blow-by gases back to the intake.

64. Which type of engine cooling uses water? 

A) Air cooling
B) Liquid cooling
C) Oil cooling
D) None of the above
Answer: B
Explanation: Liquid cooling circulates water or coolant to remove heat from the engine.

65. What is the purpose of a catalytic converter? 

A) Reduce engine noise
B) Convert harmful gases to less harmful ones
C) Increase fuel flow
D) Start the engine
Answer: B
Explanation: Catalytic converters reduce harmful emissions like CO, NOx, and hydrocarbons.

66. Which component stores energy to maintain engine rotation? 

A) Flywheel
B) Crankshaft
C) Piston
D) Camshaft
Answer: A
Explanation: Flywheels store rotational energy to smooth out engine cycles.

67. What is the purpose of a clutch release bearing? 

A) Engage the clutch
B) Reduce friction between clutch pressure plate and release fork
C) Control brakes
D) Start the engine
Answer: B
Explanation: It allows smooth engagement and disengagement of the clutch.

68. Which type of brake is self-adjusting? 

A) Disc brake
B) Drum brake
C) Air brake
D) Hydraulic brake
Answer: B
Explanation: Drum brakes have mechanisms to adjust brake shoe clearance automatically.

69. What is the function of an engine oil filter? 

A) Remove contaminants from engine oil
B) Increase oil pressure
C) Start the engine
D) Reduce fuel consumption
Answer: A
Explanation: Oil filters keep the engine oil clean to protect moving parts.

70. Which part drives the camshaft in an engine? 

A) Crankshaft
B) Piston
C) Flywheel
D) Alternator
Answer: A
Explanation: Camshaft is driven by the crankshaft via belt, chain, or gears to time valve operation.

71. What is the primary function of an intercooler? 

A) Cool engine oil
B) Cool compressed air from turbocharger
C) Reduce coolant temperature
D) Lubricate engine
Answer: B
Explanation: Intercoolers lower the temperature of air entering the engine, improving efficiency.

72. Which system prevents wheel lock during braking? 

A) ABS
B) EBD
C) ESP
D) Traction control
Answer: A
Explanation: Anti-lock Braking System (ABS) prevents wheel lock-up for better control.

73. Which component is responsible for controlling vehicle speed automatically? 

A) Cruise control
B) Accelerator
C) Brake pedal
D) Clutch
Answer: A
Explanation: Cruise control maintains a set vehicle speed without driver input.

74. What is the purpose of a throttle position sensor? 

A) Measure air pressure
B) Detect throttle opening and control fuel injection
C) Cool engine
D) Start engine
Answer: B
Explanation: TPS helps engine control unit adjust fuel injection and ignition timing.

75. Which part converts DC voltage to AC in a vehicle? 

A) Alternator
B) Inverter
C) Rectifier
D) Battery
Answer: B
Explanation: Inverters convert DC from batteries to AC for electric motor operation.

76. Which component ensures proper lubrication at high temperatures? 

A) Oil cooler
B) Oil pump
C) Oil filter
D) Radiator
Answer: A
Explanation: Oil cooler reduces oil temperature to maintain viscosity and lubrication.

77. What is the main function of a turbocharger? 

A) Reduce fuel consumption
B) Increase air intake and engine power
C) Cool engine
D) Start engine
Answer: B
Explanation: Turbochargers compress intake air to increase combustion efficiency.

78. Which system measures and displays fuel level? 

A) Fuel gauge
B) Speedometer
C) Odometer
D) Tachometer
Answer: A
Explanation: Fuel gauge indicates the amount of fuel remaining in the tank.

79. What is the purpose of a vehicle’s air filter? 

A) Remove impurities from intake air
B) Mix fuel and air
C) Lubricate engine
D) Start engine
Answer: A
Explanation: Air filters prevent dust and debris from entering the engine.

80. Which component prevents backflow of fuel? 

A) Fuel pump
B) Check valve
C) Carburetor
D) Injector
Answer: B
Explanation: Check valves ensure one-way fuel flow to prevent flooding.

81. What is the purpose of a vehicle’s steering knuckle? 

A) Connect wheel to suspension
B) Start engine
C) Control fuel flow
D) Absorb vibration
Answer: A
Explanation: Steering knuckle connects the wheel hub to suspension components.

82. Which component reduces vibration in drive shafts? 

A) Universal joint
B) Differential
C) Bearing
D) Flywheel
Answer: A
Explanation: Universal joints allow drive shafts to transmit power smoothly at varying angles.

83. Which system reduces skid during braking? 

A) ABS
B) Steering
C) Transmission
D) Suspension
Answer: A
Explanation: ABS prevents wheel lock-up, reducing skid risk.

84. Which part stores compressed air in an air brake system? 

A) Air tank
B) Reservoir
C) Compressor
D) Cylinder
Answer: A
Explanation: Air tanks store compressed air to apply brakes on demand.

85. What is the function of a cam gear? 

A) Drive the crankshaft
B) Drive the camshaft
C) Start the engine
D) Measure RPM
Answer: B
Explanation: Cam gear ensures camshaft rotates in sync with the crankshaft.

86. Which component controls emission recirculation in diesel engines? 

A) EGR valve
B) Turbocharger
C) Fuel injector
D) Radiator
Answer: A
Explanation: Exhaust Gas Recirculation (EGR) reduces NOx emissions by recirculating exhaust gas.

87. Which type of engine uses both spark and compression ignition? 

A) Diesel
B) Petrol
C) Dual-fuel engine
D) Electric
Answer: C
Explanation: Dual-fuel engines can operate using spark ignition or compression ignition.

88. Which component helps maintain tire contact with road? 

A) Suspension system
B) Steering system
C) Transmission
D) Clutch
Answer: A
Explanation: Suspension absorbs shocks and keeps tires in contact with the road.

89. What is the purpose of a water pump in an engine? 

A) Lubricate engine
B) Circulate coolant through engine and radiator
C) Start the engine
D) Increase fuel flow
Answer: B
Explanation: Water pumps maintain coolant circulation to prevent overheating.

90. Which type of lubrication is used in gearboxes?

A) Oil lubrication
B) Grease lubrication
C) Air lubrication
D) Water lubrication
Answer: B
Explanation: Grease or heavy oil reduces friction and wear between gears.

91. Which component converts mechanical energy into electrical energy? 

A) Battery
B) Alternator
C) Starter motor
D) Ignition coil
Answer: B
Explanation: Alternators generate electricity for vehicle electrical systems.

92. Which part prevents engine overheating by releasing excess pressure? 

A) Radiator cap
B) Thermostat
C) Water pump
D) Oil cooler
Answer: A
Explanation: Radiator caps release excess pressure and prevent coolant loss.

93. What is the purpose of a drive shaft? 

A) Transmit torque from transmission to wheels
B) Lubricate engine
C) Cool the engine
D) Control brakes
Answer: A
Explanation: Drive shafts transfer rotational power from the gearbox to the axle.

94. Which type of battery is commonly used in vehicles? 

A) Lead-acid battery
B) Nickel-cadmium battery
C) Lithium-ion battery
D) Alkaline battery
Answer: A
Explanation: Lead-acid batteries provide high surge current and are widely used in vehicles.

95. What is the function of a timing chain?

A) Connect crankshaft and camshaft
B) Drive the alternator
C) Start engine
D) Control brakes
Answer: A
Explanation: Timing chains synchronize camshaft and crankshaft rotation.

96. Which system controls engine fuel injection electronically?

A) Carburetor
B) EFI system
C) Mechanical pump
D) Throttle
Answer: B
Explanation: Electronic Fuel Injection (EFI) systems control fuel delivery precisely.

97. What is the purpose of a crankshaft pulley?

A) Drive belts for accessories
B) Measure engine speed
C) Start the engine
D) Lubricate engine
Answer: A
Explanation: Crankshaft pulley drives alternator, water pump, and other accessories via belts.

98. What is the function of a fuel pressure regulator?

A) Increase fuel injection
B) Maintain constant fuel pressure to injectors
C) Start the engine
D) Control air intake
Answer: B
Explanation: Fuel pressure regulator ensures injectors receive consistent fuel pressure.

99. What is the function of a vehicle’s alternator belt?

A) Drive the crankshaft
B) Drive alternator and other accessories
C) Start the engine
D) Lubricate engine
Answer: B
Explanation: Alternator belt transmits rotational motion to the alternator and other belt-driven accessories.

100. Which part controls air intake in a carbureted engine?

A) Throttle valve
B) Spark plug
C) Fuel injector
D) Radiator
Answer: A
Explanation: Throttle valve regulates the air entering the carburetor, controlling engine speed and power.