Session 2: Servicing of Propeller Shaft, Universal and Slip Joints
Module 3: Transmission System
Textual Question-Answers
Check Your Progress
Fill in the blanks
1. If the dial gauge shows a deflection of 2 mm, it indicates that thepropeller shaft is ……………
Ans: bent.
2. The drive shaft is responsible for transmitting power from the……….. to the ……………
Ans: gearbox to the differential.
3. To prevent squeaking noise, it’s recommended to lubricate the…………… joints and propeller shaft.
Ans: universal.
4. The drive shaft assembly consists of inboard joint, wheel sidejoint, and …………….. joint.
Ans: slip.
Multiple Choice Questions (MCQs)
1. What is the purpose of a propeller shaft in a vehicle?
A) To clean the engine
B) To transmit power between the gearbox and differential
C) To steer the vehicle
D) To control suspension
Ans: B) To transmit power between the gearbox and differential
2. Which component connects the engine to the wheels and is usuallymade of steel?
A) Steering wheel
B) Drive shaft
C) Universal joint
D) Differential gear
Ans: B) Drive shaft
3. What is the consequence of a bent propeller shaft?
A) Improved fuel efficiency
B) Reduced noise
C) No effect on performance
D) Noisy operation
Ans: D) Noisy operation
4. What should be done if the universal joint cross is worn out?A) Replace the propeller shaft
B) Clean the joint with solvent
C) Replace the universal joint cross
D) Lubricate the differential
Ans: C) Replace the universal joint cross
Answer the following questions
1. What is the purpose of using propeller shaft or driveshaft in thevehicle?
Ans: The propeller shaft or driveshaft transmits engine power from thegearbox to the differential and finally to the driving wheels.
2. Explain the various parts of the propeller shaft or driveshaft.
Ans: The main parts are the propeller shaft tube, universal joints, slipjoint, yokes, flanges, and bearings, which together transmit power smoothly.
3. When universal joint and slip joint need replacement?
Ans: Universal joint and slip joint need replacement when there isexcessive play, noise, vibration, wear, or difficulty in smooth powertransmission.
4. Describe the functions of a drive shaft.
Ans: The drive shaft transmits torque, allows angular and length variationduring suspension movement, and ensures smooth power delivery to thewheels.
Activity
1. Make a list of steps that are adopted for inspection of propellershaft, universal joint and slip joint of a vehicle
Ans:
S. No. Steps
1. Inspect the propeller shaft for bends or cracks
2. Check universal joints for wear and free movement
3. Inspect slip joint for smooth sliding action
4. Check for proper lubrication and tightness of bolts
2. In a vehicle, the propeller shaft is running noisy; make a list ofcauses and remedies
Ans:
S. No. Causes Remedies
1. Worn universal joint Replace the universal joint
2. Lack of lubrication Lubricate joints properly
3. Bent propeller shaft Repair or replace shaft
4. Loose mounting bolts Tighten all bolts
