# Machine Design Questions and Answers – Cone & Centrifugal Clutches

This set of Machine Design Question Bank focuses on “Cone & Centrifugal Clutches”

1. 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. 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. 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. 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. 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.
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6. 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. 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. 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. 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. 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. In a centrifugal clutch, when the centrifugal force is slightly more than the spring force, shoe begins to move in a radially inward direction.

Explanation: It moves in radially outward direction.

12. Chain saws, lawnmowers, golf carts etc. never use centrifugal clutches.
a) True
b) No, it is highly used
c) Depends on the load required
d) None of the listed

Explanation: The electric motor has time to accelerate to reach the operating speed before it takes the load and hence centrifugal clutches are used.

13. The centrifugal clutches are used in light duty vehicles and not in heavy duty vehicles.
a) True
b) False

Explanation: Centrifugal clutches are used in heavy uty applications as they provide a time delay that is sufficient to permit the prime mover to gain momentum before taking over the load.

14. Find number of contacting surfaces for a multi disk clutch plate transmitting torque of 10N-m and inner and outer diameters of friction lining are 70mm and 100mm respectively. The operating force is of magnitude 305N and coefficient of friction is 0.2.
a) 5
b) 2
c) 4
d) 3

Explanation: z=4M/μP(D+d).

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