# MCQs on Cone & Centrifugal Clutches

1 - Question

A cone clutch consists of inner conical surface and outer cylindrical surface.

a) Both cylindrical
b) Both conical
c) Outer conical and inner cylindrical
d) True

Explanation: It consists of both inner and outer conical surfaces.

2 - Question

Power is transmitted only by key and friction in the cone clutch.

a) Only by spline
b) By key, spline and friction
c) By friction only
d) By key only

Explanation: Power is transmitted via key, friction and spline.

3 - Question

The torque transmitting capacity of cone clutch increases as its semi vertical angle increase.

a) True
b) Decreases
c) Remains constant
d) None of the listed

Explanation: Torque transmitted is inversely proportional to the sin of the semi vertical angle.

4 - Question

When semi vertical angle is greater than angle of static friction, clutch results in self-engagement.

a) True
b) False

Explanation: Self engagement takes place when semi vertical angle is reduced so low to increase torque capacity that it become smaller than static friction angle.

5 - Question

A cone clutch with a small semi cone angle requires a relatively large force to engage and small force to disengage.

a) True
b) False

Explanation: It requires large force to disengage.

6 - Question

A cone clutch transmits 24kW at 490rpm. The coefficient of friction is 0.2 and allowable intensity of pressure is 0.35N/mm². The semi cone angle is 12⁰. The outer diameter is fixed as 310mm.Assuming uniform wear theory; find the maximum torque which is transmitted.

a) 502.4N-m
b) 542.3N-m
c) 467.72N-m
d) 454.5N-m

Explanation: M=Powerx10ᵌx60/2πN.

7 - Question

A cone clutch transmits 24kW at 490rpm. The coefficient of friction is 0.2 and allowable intensity of pressure is 0.35N/mm². The semi cone angle is 12⁰. The outer diameter is fixed as 310mm.Assuming uniform wear theory; find the inner diameter.

a) 275mm
b) 300mm
c) 290mm
d) 280mm

Explanation: M=πpμd(D²-d²)/8Sinἀ.

8 - Question

A cone clutch transmits 24kW at 490rpm. The coefficient of friction is 0.2 and allowable intensity of pressure is 0.35N/mm². The semi cone angle is 12⁰. The outer diameter is fixed as 310mm.Assuming uniform wear theory; find the face width of friction lining.

a) None of the listed
b) 48.1mm
c) 52.2mm
d) 56.8mm

Explanation: b=D-d/2Sinἀ.

9 - Question

A cone clutch transmits 24kW at 490rpm. The coefficient of friction is 0.2 and allowable intensity of pressure is 0.35N/mm². The semi cone angle is 12⁰. The outer diameter is fixed as 310mm.Assuming uniform wear theory; calculate force required to engage clutch.

a) 3546.9N
b) 2231.5N
c) 3241.5N
d) 4354.5N

Explanation: P=4MSinἀ/μ(D+d).

10 - Question

Centrifugal clutches are not recommended for IC engine applications.

a) True
b) False

Explanation: IC engine is not able to start under load ad hence centrifugal clutches are used.

11 - Question

In a centrifugal clutch, when the centrifugal force is slightly more than the spring force, shoe begins to move in a radially inward direction. x

In a centrifugal clutch, when the centrifugal force is slightly more than the spring force, shoe begins to move in a radially inward direction.