ITI Mechanic Motor Vehicle 3rd Semester Exam Papers

The course of Mechanic Motor Vehicle is of 2 years and where there is semester system, its complete study is done in 4 semesters or we can say that it is divided in 4 semesters, so below you are given the question paper of its 3rd semester which has been asked earlier in its exam, so solve it carefully and many more question papers related to this trade are given on our website, by solving which you can prepare yourself.

ITI RAC Theory 3rd Semester Exam Papers

1. The term “ply rating” in relation to a tyre refers to –

•Actual number of plies
•Recommended inflation pressure
•Aspect ratio
•Rated strength
Answer. Rated strength

2. When the hydraulic brake pedal is pressed by the driver and feels spongy, it indicates that

•Brake shoe clearance is excessive
•There is air in the system
•The system is in good condition
•Brake fluid needs to be replaced
Answer. There is air in the system

3. Which of the following can be adjusted by modifying the length of the tie-rod connected to the axle?

•Camber
•Caster
•Toe-in or toe-out
•Steering gear ratio
Answer. Toe-in or toe-out

4. A damper is also known as………….

•Torsion bar
•Spring
•Stabilizer
•Shock absorber
Answer. Shock absorber

5.What is the advantage of Mac-Person strut suspension system?

•Number of parts is very less
•Assembly is light
•Un-sprung weight is less
•All of the above
Answer. All of the above

6. In most vehicles with automatic transmission, the engine is connected to the gear box through………….

•Multi-plate clutch
•Dog clutch
•Magnetic clutch
•Fluid clutch (fluid coupling or torque converter)
Answer. Fluid clutch (fluid coupling or torque converter)

7. A device which is capable of transferring rotary motion from one shaft to another on the same axis is called?

•Gear box
•Differential
•Clutch
•Fly wheel
Answer. clutch

8. The Electronic Power Steering (EPS) system control unit controls the auxiliary motor based on signals from………….

•Road resistance, steering turning speed and vehicle speed
•Road resistance, steering turning direction and engine speed
•Road resistance, steering turning direction and vehicle speed
•Road resistance, steering turning speed and engine speed
Answer. Road resistance, steering turning direction and vehicle speed

9. What is the function of electronically controlled automatic transmission?

•Automatic downshifting when going down a hill to control speed
•Automatic upshifting when braking on a slippery surface
•Preventing the upshift when turning
•All of the above
Answer: All of the above

10. What is the most popular manual steering gear for cars?

•Worm and wheel type
•Worm and nut type
•Rack and pinion type
•Re-circulating ball type
Answer. Rack and pinion type

11. The free pedal play in a car clutch is about….

•5 mm
•25 mm
•45 mm
•65 mm
Answer. 25 mm

12. In a torque converter, maximum torque multiplication occurs at………….

•Stop
•Low speed
•Medium speed
•High speed
Answer. Stop

13. The part of the tyre which is in contact with the road surface is called –

•Carcass
•Bead
•Tread
•Ply
Answer. Tread

14. In which type of suspension compressed air is required

•Rigid axle suspension
•Air suspension
•Mc-Person strut suspension
•Double wishbean suspension
Answer. Air suspension

15. The function that allows the driver to raise or lower the steering wheel is……

•Power steering system
•Till steering system
•Air bag system
•Rack and pinion type steering system
Answer. Till steering system

16. The efficiency of mechanical brakes is usually ……….

•30-40 percent
•40-50 percent
•50-60 percent
•60-70 percent
Answer. 60-70 percent

17. What defects can under-inflated tyres cause?

•G steering
•Hard steering
•Front wheel tramp
•Front wheel shimmy
Answer. Hard steering

18. The effect of excessive camber is –

•High steering alignment torque
•Hard steering
•Excessive traction
•Asymmetrical tire wear
Answer. Asymmetrical tire wear

19. The term “riding on the clutch” means – the habit of the driver keeping his foot on the clutch

•On the clutch pedal
•Beyond the clutch pedal
•Continuously pressing the clutch pedal
•Trying to shift gears without pressing the clutch pedal
Answer. On the clutch pedal

20. If your driving licence expires then you can get your licence renewed for a maximum period of …………..

•3 years from the expiry date of validity
•4 years from the expiry date of validity
•5 years from the expiry date of validity
•6 years from the expiry date of validity
Answer. 5 years from the expiry date of validity

21. Brake bleeding process removes ……….. from the system.

•Air
•Vacuum
•Extremely fluid
•Extremely pressure
Answer: Air

22. The central gear of an epicyclic gear set is called?

•Sun-gear
•Planet gear
•Internal gear
•Central gear
Answer. Sun-gear

23. Synchronizer hub is connected to the main shaft by……….

•Synchronizer key
•Shift fork
•Synchronizer ring
•Spline inside the hub
Answer. Spline inside the hub

24. An under-inflated tyre may…….wear more.

•Near the center
•Near the edge
•In cross-section
•In the lateral direction
Answer: Near the center

25. Power steering pump is?

•Belt driven by camshaft
•Chain driven by crankshaft
•Chain driven by camshaft
•Belt driven by crankshaft
Answer. Belt driven by crankshaft

26. What is “brake fade”?

•Lack of pedal free play
•Lack of hydraulic fluid
•Low coefficient of friction
•Discoloration of lining due to oil soaked through the lining
Answer. Lack of hydraulic fluid

27. When the spring flexes, the part that allows the distance between the spring eyes and the leaf spring to change is called …..

•U-bolt
•Shackle
•Leaf
•Bush
Answer. Shackle

28. The traffic sign of “CROSS ROADS” is shown on the road side which indicates to the driver that ……….. –

•Stopping
•Being extra alert for traffic
•20 km. Drive at an hour
•Slow down and proceed with caution
Answer. Slow down and proceed with caution

29. Violation of which road sign is a legal offence?

•Mandatory signs
•Warning signs
•Informative signs
•None of the above
Answer. Mandatory signs

30. Cushioning spring is used in clutch plate to reduce……..

•Vibration
•Jerk
•Vehicle speed
•None of these
Answer. Jerk

31. In case of CVT, if drive pulley diameter is reduced and driven pulley diameter is increased then –

•Output torque will decrease and output speed will increase
•Output torque will increase and output speed will decrease
•Both output torque and speed will increase
•Both output torque and speed will decrease
Answer. Output torque will increase and output speed will decrease

32. The purpose of caster is?

• Ensuring steering stability
• Reducing the rolling resistance of the tyres during cornering
• Allowing the vehicle to be towed easily
• Eliminating the tendency to toe-out
Answer. Ensuring steering stability

33. The disadvantage of radial ply tyres as compared to cross ply tyres is –

•Uncomfortable ride at low speeds
•Uncomfortable ride at high speeds
•Higher cornering power
•Lower rolling resistance
Answer. Uncomfortable ride at low speeds

34. The component in a torque converter that allows torque to be multiplied?

•Pump
•Starter
•Turbine
•Impeller
Answer. Starter

35. In hydraulic fluid controlled automatic transmission, gear shifting is based on ……….

•Governor and throttle pressure
•Governor pressure only
•Throttle pressure only
•None of these
Answer. Governor and throttle pressure

36. The function of shock absorber is –

•Absorbing energy
•Releasing energy
•Damping down the oscillation of suspension spring
•Producing energy
Answer. Damping down the oscillation of suspension spring

37. The purpose of a stabilizer in an automobile is to reduce body …….

•roll
•pitch
•yaw
•dip
Answer. roll

38. The springs generally used in heavy duty automobiles are?

• Coil Spring
• Elliptical Leaf Spring
• Quarter Elliptical Leaf Spring
• Half Elliptical Leaf Spring
Answer. Semi-Elliptic Leaf Spring

39. In disc brakes, the pad-to-disc adjustment is determined by………..

•Caliper
•Piston
•Piston seal
•Bleed screw
Answer. Piston seal

40. Clutch is located between the gear box and ………..

•Engine
•Rear axle
•Propeller shaft
•Differential
Answer. Engine

41. The role of Antilock Brake System (ABS) is to –

•It reduces the stopping distance of the vehicle
•It minimises brake fade
•It maintains directional control by preventing wheel locking
•It prevents nose dive during braking and thus prevents wheel locking
Answer. It maintains directional control by preventing wheel locking

42. “Clutch slippage” is especially noticeable when the clutch is engaged?

•At low speeds
•At idling
•During acceleration
•While starting the engine
Answer. During acceleration

43. What are two advantages of using helical gears over spur gears in a transmission?

•High strength and low cost
•High strength and low end thrust
•Low sound level and high strength
•Low sound level and cheap
Answer. Low sound level and high strength

44. One of the purposes of re-circulating ball type steering gear is to reduce………

•Toe-out during turn
•Operating friction
•Operating cost
•None of these
Answer: Operating friction

45. In a simple planetary gear, the member which carries the torque is?

•Ring gear
•Sun-gear
•Planet carrier
•None of these
Answer. Planet carrier

46. Vehicle ride will be comfortable if

•Un-sprung weight is kept minimum
•Un-sprung weight is kept maximum
•Spring (sprung) weight is kept minimum
•Vehicle weight is kept minimum
Answer. Un-sprung weight is kept minimum

47. The main function of the master cylinder is to –

•Adjusts the amount of brake pedal play
•Boosts the force applied to the brake pedal
•Converts brake pedal force into hydraulic pressure
•Ensures that all wheel brakes are supplied with the same amount of fluid pressure
Answer. Converts brake pedal force into hydraulic pressure

48. The running radius of a vehicle is the radius about which the ……….wheel rotates.

•Inner front
•Outer front
•Inner rear
•Outer rear
Answer. Outer front

49. A type of wheel rim that cannot be used with tubeless tyres?

•Disc wheel rim
•Wire spoke wheel rim
•Light alloy wheel rim
•Complex wheel rim
Answer. Wire spoke wheel rim

50. The registration age and insurance validity of a vehicle are respectively –

•3 years and lifespan
•1 year and 15 years
•5 years and 10 years
•Lifespan and 20 years
Answer. 1 year and 15 years
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