Kinematics and Theory of Machines (3131906) MCQs

MCQs of Friction, Clutch and Brake

Showing 31 to 40 out of 77 Questions
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31.

______________ is the friction experienced between two dry and unlubricated surfaces in contact.

(a)

Pivot friction
(b)

Solid friction
(c)

Boundary friction
(d)

Static friction
Answer:

Option (b)

32.

_____________ is/are a measure of the resistance offered to the sliding one layer of the lubricant over an adjacent layer.

(a)

Viscocity
(b)

Density
(c)

Oiliness
(d)

Density and oiliness
Answer:

Option (a)

33.

What is the direction in which the limiting friction acts?

(a)

Opposite to the direction in which the body tends to move
(b)

Opposite to the direction in which the body moves
(c)

In the direction in which the body tends to move
(d)

In the direction in which the body moves
Answer:

Option (a)

34.

If the area of contact between the two surfaces is increased by two times, what will be the effect of it on the force of friction?

(a)

Increases by two times
(b)

Decreases by two times
(c)

Remains same
(d)

Depends on the surface
Answer:

Option (c)

35.

The ratio of frictional force to normal reaction is known as _______.

(a)

Coefficient of friction
(b)

Coefficient of restitution
(c)

Coefficient of inertia
(d)

Coefficient of force
Answer:

Option (a)

36.

Which of the following is true regarding the limiting friction?

(a)

Its value is equal to the force applied in the opposite direction which tends to move the body
(b)

Its value is equal to the force applied in the opposite direction which moves the body
(c)

Its value is equal to μ.N
(d)

It is equal to the normal reaction
Answer:

Option (a)

37.

The angle at which the body just begins to slide down an incline is known as ________.

(a)

angle of inclination
(b)

angle of motion
(c)

angle of repose
(d)

angle of stability
Answer:

Option (c)

38.

For a body on an inclined plane, the value of the coefficient of friction is equal to _____ (where θ is the angle of friction).

(a)

tan θ
(b)

cot θ
(c)

sin θ
(d)

cos θ
Answer:

Option (a)

39.

What is the maximum value of static friction?

(a)

Zero
(b)

Limiting friction
(c)

Rolling friction
(d)

Kinetic friction
Answer:

Option (b)

40.

A screw jack has square threads and the lead angle of the thread is α. The screw jack will be self-locking when the coefficient of friction (μ) is ______.

(a)

μ > tan α
(b)

μ = sin α
(c)

μ = cot α
(d)

μ = cosec α
Answer:

Option (a)

Showing 31 to 40 out of 77 Questions
1 2 3 4 5 6