# Friction Clutches - Mechanical Engineering (MCQ) questions and answers

1)   Calculate torque transmitted by the clutch having four shoes, which has spring force of 700 N and centrifugal force of 4000 N. Rim diameter is 560 mm and coefficient of friction is 0.3

a. 1100 N
b. 1000 N
c. 1579 N
d. 1108.8 N
 Answer  Explanation ANSWER: 1108.8 N Explanation: No explanation is available for this question!

2)   According to uniform wear theory, frictional torque transmitted in flat collar bearing is given as

a. 2/3 [ μ W (R1 - R2)]
b. 1/2 [ μ W (R1 + R2)]
c. 2/3 μ W [(R1 + R2) / (R1 - R2)]
d. none of the above
 Answer  Explanation ANSWER: 1/2 [ μ W (R1 + R2)] Explanation: No explanation is available for this question!

3)   Which of the following condition is true for uniform wear theory?

a. p = constant
b. p/r = constant
c. p.r = constant
d. none of the above
 Answer  Explanation ANSWER: p.r = constant Explanation: No explanation is available for this question!

4)   The frictional resistance (Tr) offered by the ring in flat pivot bearing is given as

a. 2 π μ p r δr
b. 2 π μ p r2 δr
c. 2/3 π μ p r δr
d. 2/3 π μ p r2 δr
 Answer  Explanation ANSWER: 2 π μ p r δr Explanation: No explanation is available for this question!

5)   Which theory is used to determine safe design of bearings?

a. Uniform wear theory
b. Uniform pressure theory
c. both a. and b.
d. none of the above
 Answer  Explanation ANSWER: Uniform pressure theory Explanation: No explanation is available for this question!

6)   Frictional torque transmitted by uniform wear theory is more than torque transmitted by uniform pressure theory

a. True
b. False

 Answer  Explanation ANSWER: False Explanation: No explanation is available for this question!

7)   The internal and external diameter of a shaft are 300 mm and 500 mm respectively. Thrust pressure is 6 x 106 N/m2.Calculate the load on the shaft which is taken by 5 collars.

a. 3769.911 N
b. 15079.644 kN
c. 3769.911 kN
d. 15079.644 N
 Answer  Explanation ANSWER: 3769.911 kN Explanation: No explanation is available for this question!

8)   Which of the following statements is/are true?

a. Friction clutches give positive engagement
b. Square shaped jaws in jaw clutch are driven in one direction
c. Spiral shaped jaws in jaw clutch are driven in one direction
d. All the above statements are true
 Answer  Explanation ANSWER: Spiral shaped jaws in jaw clutch are driven in one direction Explanation: No explanation is available for this question!

9)   Which clutch is known as wet clutch?

a. Single plate clutch
b. multi plate clutch
c. both a. and b.
d. none of the above
 Answer  Explanation ANSWER: multi plate clutch Explanation: No explanation is available for this question!

10)   In centrifugal clutches, when is the contact between shoe friction lining and surface of drum observed?

a. When centrifugal force is less than spring force
b. When centrifugal force is equal to spring force
c. When centrifugal force is greater than spring force
d. None of the above
 Answer  Explanation ANSWER: When centrifugal force is equal to spring force Explanation: No explanation is available for this question!