Kinematics and Theory of Machines (3131906) MCQs

MCQs of Friction, Clutch and Brake

Showing 1 to 10 out of 77 Questions
1.

The angle of inclination of the plane, at which the body begins to move down the plane, is called ________.

(a)

angle of friction

(b)

angle of repose

(c)

angle of projection

(d)

helix angle

Answer:

Option (a)

2.

In a screw jack, the effort required to lift the load W is given by _____ where α is helix angle and Φ is the angle of friction.

(a)

P=W×tan (α-ϕ)

(b)

P=W×tan (α+ϕ)

(c)

P=W×cos (α-ϕ)

(d)

P=W×cos (α+ϕ)

Answer:

Option (b)

3.

The efficiency of a screw jack is given by _______.

(a)

tan (α+ϕ)tan α

(b)

tan αtan (α+ϕ)

(c)

tan (α-ϕ)tan α

(d)

tan αtan (α-ϕ)

Answer:

Option (b)

4.

The radius of a friction circle for a shaft of radius r rotating inside a bearing is ______.

(a)

r×sin ϕ

(b)

r×cos ϕ

(c)

r×tan ϕ

(d)

r×cot ϕ

Answer:

Option (a)

5.

The efficiency of a screw jack is maximum when _______.

(a)

α=45°+ϕ2

(b)

α=45°-ϕ2

(c)

α=90°+ϕ

(d)

α=90°-ϕ

Answer:

Option (b)

6.

The maximum efficiency of a screw jack is ______.

(a)

1-sinϕ1+sinϕ

(b)

1+sinϕ1-sinϕ

(c)

1-tanϕ1+tanϕ

(d)

1+tanϕ1-tanϕ

Answer:

Option (a)

7.

The frictional torque transmitted in a flat pivot bearing, considering uniform pressure, is ________.

(a)

12×μ W R

(b)

23×μ W R

(c)

34×μ W R

(d)

μ WR

Answer:

Option (b)

8.

The frictional torque transmitted in a conical pivot bearing, considering uniform wear, is ______.

(a)

12×μ W R×cosec α

(b)

23×μ W R×cosec α

(c)

34×μ W R×cosec α

(d)

μ W R×cosec α

Answer:

Option (a)

9.

The frictional torque transmitted by a disc or plate clutch is the same as that of _______ bearing.

(a)

flat pivot

(b)

flat collar

(c)

conical pivot

(d)

trapezoidal pivot

Answer:

Option (b)

10.

The frictional torque transmitted by a cone clutch is the same as that of ________ bearing,

(a)

flat pivot

(b)

flat collar

(c)

conical pivot

(d)

trapezoidal pivot

Answer:

Option (d)

Showing 1 to 10 out of 77 Questions