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Mechanical - UNIT - 7 - Friction - MCQ

51)   

Friction between two dry surfaces without lubrication is called:

A.
B.
C.
D.
Answer: C
52)   

Friction between lubricated surfaces is called:

A.
B.
C.
D.
Answer: C
53)   

Which of the following is a merit of friction in workshop practice?

A.
B.
C.
D.
Answer: B
54)   

Which friction acts when a body starts moving?

A.
B.
C.
D.
Answer: B
55)   

Which component in vehicles uses friction for power transmission?

A.
B.
C.
D.
Answer: C
56)   

The coefficient of rolling friction is generally:

A.
B.
C.
D.
Answer: C
57)   

 A machine without proper lubrication may result in:

A.
B.
C.
D.
Answer: B
58)   

 Which of the following has lowest friction? 

A.
B.
C.
D.
Answer: C
59)   

Which law of friction states that friction is independent of area of contact? 

A.
B.
C.
D.
Answer: B
60)   

Which material provides high friction when dry?

A.
B.
C.
D.
Answer: C
61)   

The maximum value of static friction is called: 

A.
B.
C.
D.
Answer: C
62)   

Which one of the following reduces both wear and friction?

A.
B.
C.
D.
Answer: B
63)   

Frictional force always acts in a direction: 

A.
B.
C.
D.
Answer: C
64)   

A wedge is effective because of:

A.
B.
C.
D.
Answer: C
65)   

What happens to friction when surface roughness increases?

A.
B.
C.
D.
Answer: B
66)   

What is the nature of frictional force? 

A.
B.
C.
D.
Answer: B
67)   

When a body slides over another, the friction acting is

A.
B.
C.
D.
Answer: C
68)   

 In machines, lubricant acts as a:

A.
B.
C.
D.
Answer: D
69)   

The angle of friction increases when:

A.
B.
C.
D.
Answer: B
70)   

Friction between tyres and road is an example of:

A.
B.
C.
D.
Answer: A
71)   

 In workshop practice, oiling is done to:

A.
B.
C.
D.
Answer: B
72)   

Which of the following is used to measure coefficient of friction? 

A.
B.
C.
D.
Answer: A
73)   

Which of the following has maximum coefficient of friction?

A.
B.
C.
D.
Answer: B
74)   

In metal cutting, friction is reduced by:

A.
B.
C.
D.
Answer: B
75)   

Which friction is most desirable in brakes? 

A.
B.
C.
D.
Answer: A