# Friction - Mechanical Engineering (MCQ) questions and answers

1)   Which motion has magnitude of static frictional force directly proportional to normal reaction?

a. Actual motion
b. Impending motion
c. Both a. and b.
d. None of the above
 Answer  Explanation ANSWER: Impending motion Explanation: No explanation is available for this question!

2)   Which formula is used to calculate angle of static friction (Φs)?

a. tan-1 μs
b. sin-1 μs
c. cos-1 μs
d. none of the above
 Answer  Explanation ANSWER: tan-1 μs Explanation: No explanation is available for this question!

3)   Frictional force depends on ________

a. surface area in contact
b. roughness of surface
c. both a. and b.
d. none of the above
 Answer  Explanation ANSWER: roughness of surface Explanation: No explanation is available for this question!

4)   Which belt is used to transmit power at high speeds?

a. Flat belt
b. V belt
c. Both a. and b.
d. None of the above
 Answer  Explanation ANSWER: V belt Explanation: No explanation is available for this question!

5)   What is the relation between tight side and slack side for a flat belt?

a. (Tight side x slack side) = eμβ
b. (Tight side / slack side) = eμβ
c. (Tight side + slack side) = eμβ
d. None of the above
 Answer  Explanation ANSWER: (Tight side / slack side) = eμβ Explanation: No explanation is available for this question!

6)   Which of the following statements is true for flat belts?

a. They are used for short distances between the pulleys
b. They have high efficiency
c. They are used in lathe machines
d. All of the above
 Answer  Explanation ANSWER: They are used in lathe machines Explanation: No explanation is available for this question!