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Mechanical - UNIT - 7 - Friction - MCQ

101)   

When the angle of friction is 45°, the coefficient of friction is:

A.
B.
C.
D.
Answer: B
102)   

Frictional force always acts:

A.
B.
C.
D.
Answer: B
103)   

 Match the following:

| A. Static friction | 1. Motion between surfaces 
| B. Sliding friction | 2. No motion but contact 
| C. Rolling friction | 3. Ball bearings 
| D. Fluid friction | 4. Air or liquid resistance

A.
B.
C.
D.
Answer: A
104)   

The main reason for applying lubrication in a gearbox is:

A.
B.
C.
D.
Answer: B
105)   

 Which condition will not reduce friction?

A.
B.
C.
D.
Answer: C
106)   

Friction helps in holding nails in the wall because of:

A.
B.
C.
D.
Answer: C
107)   

Which one increases wear and energy loss in machines? 

A.
B.
C.
D.
Answer: C
108)   

 Angle of repose is equal to: 

A.
B.
C.
D.
Answer: B
109)   

Which of the following helps increase friction in bicycle pedals?

A.
B.
C.
D.
Answer: B
110)   

 Which one is not an effect of friction in workshops?

A.
B.
C.
D.
Answer: C
111)   

If the coefficient of friction is 0, then the body:

A.
B.
C.
D.
Answer: C
112)   

What is the correct SI unit of the coefficient of friction (μ)?

A.
B.
C.
D.
Answer: B
113)   

The contact force perpendicular to a surface is called: 

A.
B.
C.
D.
Answer: B
114)   

 What happens when lubricant is applied to a machine part?

A.
B.
C.
D.
Answer: B
115)   

Why is graphite used as a dry lubricant? 

A.
B.
C.
D.
Answer: B
116)   

When does limiting friction come into play?

A.
B.
C.
D.
Answer: B
117)   

Which is true about rolling friction? 

A.
B.
C.
D.
Answer: C
118)   

Choose the correct increasing order of friction: 

A.
B.
C.
D.
Answer: A
119)   

What is the function of anti-friction bearings?

A.
B.
C.
D.
Answer: B
120)   

The coefficient of friction between rubber and dry concrete is:

A.
B.
C.
D.
Answer: B
121)   

 In workshop practice, the best way to reduce wear due to friction is:

A.
B.
C.
D.
Answer: C
122)   

 The device used to measure friction is called: 

A.
B.
C.
D.
Answer: C
123)   

In CNC machines, low-friction guides are used to: 

A.
B.
C.
D.
Answer: B
124)   

Which of the following uses high friction to function properly?

A.
B.
C.
D.
Answer: A
125)   

Dry friction occurs between:

A.
B.
C.
D.
Answer: A