# MCQs on Friction Clutches

1 - Question

Clutch and coupling perform the same action.

a) Both being permanent joints
b) No they are different type of joints
c) Both being temporary joints
d) None of the listed

Explanation: Clutch is a temporary joint while coupling is a permanent joint.

2 - Question

Eddy current clutch is a type of friction clutch.

a) Yes
b) No, it is an electromagnetic type clutch
c) It is a mechanical clutch
d) None of the listed

Explanation: Eddy current clutch is a type of electromagnetic clutch.

3 - Question

In positive contact clutches, power transmission is achieved by means of friction.

a) Yes
b) It is achieved by shear contact
c) Major part is achieved by friction
d) None of the listed

Explanation: Power transmission is achieved by interlocking of jaws or teeth.

4 - Question

The jaw clutches show great amount of slip.

a) Yes
b) Zero slip
c) Used in non-synchronous applications

Explanation: Jaw clutches do not slip and are used in synchronous applications.

5 - Question

For a new friction lining, uniform wear theory is used.

a) True
b) False

Explanation: Uniform pressure theory is used.

6 - Question

A plate clutch consists of 1 pair of contacting surfaces. The inner and outer diameter of the friction disk is 100mm and 200mm respectively. The coefficient of friction is 0.2 and permissible intensity of pressure is 1.5N/mm². Assuming uniform wear theory, calculate the operating force in the clutch.

a) 15546N
b) 12344N
c) 23562N
d) 24543N

Explanation: P=πpd(D-d)/2.

7 - Question

A plate clutch consists of 1 pair of contacting surfaces. The inner and outer diameter of the friction disk is 100mm and 200mm respectively. The coefficient of friction is 0.2 and permissible intensity of pressure is 1.5N/mm². Assuming uniform wear theory, calculate the torque transmitting capacity of the clutch.

a) 412.23N-m
b) 353.43N-m
c) 334.53N-m
d) 398.34N-m

Explanation: P=πpd(D-d)/2 and M=μP(D+d)/4.

8 - Question

A plate clutch consists of 1 pair of contacting surfaces. The inner and outer diameter of the friction disk is 100mm and 200mm respectively. The coefficient of friction is 0.2 and permissible intensity of pressure is 1.5N/mm². Assuming uniform wear theory, calculate the power transmitting capacity of the clutch at 80rad/s.

a) 27.8kW
b) 32.4kW
c) 21.2kW
d) 34.5kW

Explanation: P=πpd(D-d)/2 and M=μP(D+d)/4.Power=Mxω.

9 - Question

A plate clutch consists of 1 pair of contacting surfaces. The inner and outer diameter of the friction disk is 100mm and 200mm respectively. The coefficient of friction is 0.2 and permissible intensity of pressure is 1.5N/mm². Assuming uniform pressure theory, calculate the operating force in the clutch.

a) 15546N
b) 12344N
c) 23562N
d) 35343N

Explanation: P=πp(D²-d²)/4.

10 - Question

A plate clutch consists of 1 pair of contacting surfaces. The inner and outer diameter of the friction disk is 100mm and 200mm respectively. The coefficient of friction is 0.2 and permissible intensity of pressure is 1.5N/mm². Assuming uniform pressure theory, calculate the torque transmitting capacity of the clutch.

a) 412.23N-m
b) 549.78N-m
c) 567.54N-m
d) 678.86N-m

Explanation: P= πp(D²-d²)/4 and M=μP(Dᵌ-dᵌ)/3(D²-d²).

11 - Question

A plate clutch consists of 1 pair of contacting surfaces. The inner and outer diameter of the friction disk is 100mm and 200mm respectively. The coefficient of friction is 0.2 and permissible intensity of pressure is 1.5N/mm². Assuming uniform wear theory, calculate the power transmitting capacity of the clutch at 80rad/s.

a) 27kW
b) 32kW
c) 39kW
d) 44kW

Explanation: P= πp(D²-d²)/4 and M=μP(Dᵌ-dᵌ)/3(D²-d²).Power=Mxω.

12 - Question

If number of contacting surfaces are 5, then number of disks required in multi disk clutch are?

a) 4
b) 5
c) 6
d) Can’t be determined

Explanation: Disks=Contacting surfaces+1.

13 - Question

Multi disk clutches are dry clutches.

a) Plasma clutches
b) Wet clutches
c) Yes
d) Depends on the lubrication used

Explanation: They are wet clutches as a lot of heat is dissipated due to more contacting surfaces.

14 - Question

In scooters, generally single plate clutches are used.

a) True
b) False

Explanation: Multi disk plate clutches which are compact are used.

15 - Question

The coefficient of friction is high in multi disk plate clutch.

a) Yes
b) Coefficient of friction is less
c) Coeffficient of friction is high
d) None of the listed