The axial force (We) required for engaging a cone clutch is given by

required for engaging a cone clutch is given bya) Wn sin αb) Wn (sin α + µ cos α )c) Wn (sin α + 0.25 µ cos α )d) none of the mentioned

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

Can‚Äö√Ñ√∂‚àö√ë‚àö¬•t be determined

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

Coeffficient of friction is high

Coefficient of friction is less

Coeffficient of friction is high

Multi disk clutches are dry clutches.

Depends on the lubrication used

The axial force (We) required for engaging a cone clutch is given by

Wn (sin ‚âà√≠¬¨¬± + ¬¨¬®¬¨¬µ cos ‚âà√≠¬¨¬± )

Wn (sin ‚âà√≠¬¨¬± + 0.25 ¬¨¬®¬¨¬µ cos ‚âà√≠¬¨¬± )

In case of a multiple disc clutch, if n1 are the number of discs on the driving shaft and n2 are the number of the discs on the driven shaft, then the number of pairs of contact surfaces will be

n1 + n2 ‚Äö√Ñ√∂‚àö√ë‚àö¬® 1

The jaw clutches show great amount of slip.

Used in non-synchronous applications

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

Major part is achieved by friction

It is achieved by shear contact

Major part is achieved by friction

Eddy current clutch is a type of friction clutch.

No, it is an electromagnetic type clutch

Clutch and coupling perform the same action.

No they are different type of joints

32 + Mcqs in Friction Clutches in Machine Design Page 1 McqOptions

1.	For a power screw having square threads with lead angle of 450 and coefficient of friction of 0.15 between screw and nut, the efficiency of the power screw, neglecting collar friction, is given by
A.	74%
B.	64%
C.	54%
D.	44%
Answer» B. 64%

Discussion

2.	Centrifugal clutches are designed to provide automatic and smooth engagement of load to driving member.
A.	True
B.	False
Answer» B. False

Discussion

3.	The axial force (We) required for engaging a cone clutch is given by
A.	Wn sin α
B.	Wn (sin α + µ cos α )
C.	Wn (sin α + 0.25 µ cos α )
D.	none of the mentioned
E.	required for engaging a cone clutch is given bya) Wn sin αb) Wn (sin α + µ cos α )c) Wn (sin α + 0.25 µ cos α )d) none of the mentioned
Answer» D. none of the mentioned

Discussion

4.	In case of a multiple disc clutch, if n1 are the number of discs on the driving shaft and n2 are the number of the discs on the driven shaft, then the number of pairs of contact surfaces will be
A.	n1 + n2
B.	n1 + n2 – 1
C.	n1 + n2 + 1
D.	none of the mentioned
Answer» C. n1 + n2 + 1

Discussion

5.	A jaw clutch is essentially a
A.	positive action clutch
B.	cone clutch
C.	friction clutch
D.	disc clutch
Answer» B. cone clutch

Discussion

6.	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
Answer» D. Can’t be determined

Discussion

7.	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
Answer» C. 567.54N-m

Discussion

8.	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
Answer» E.

Discussion

9.	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
Answer» B. 32.4kW

Discussion

10.	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
Answer» C. 334.53N-m

Discussion

11.	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
Answer» D. 24543N

Discussion

12.	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/MM¬¨¬®‚ÄÖ√¢¬ß._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
Answer» C. 567.54N-m

Discussion

13.	FOR_A_POWER_SCREW_HAVING_SQUARE_THREADS_WITH_LEAD_ANGLE_OF_45⁰_AND_COEFFICIENT_OF_FRICTION_OF_0.15_BETWEEN_SCREW_AND_NUT,_THE_EFFICIENCY_OF_THE_POWER_SCREW,_NEGLECTING_COLLAR_FRICTION,_IS_GIVEN_BY?$
A.	74%
B.	64%
C.	54%
D.	44%
Answer» B. 64%

Discussion

14.	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‚Äö√Ñ√∂‚àö√ë‚àö¬•t be determined
Answer» D. Can‚Äö√Ñ√∂‚àö√ë‚àö¬•t be determined

Discussion

15.	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
Answer» C. Coeffficient of friction is high

Discussion

16.	In scooters, generally single plate clutches are used.
A.	True
B.	False
Answer» C.

Discussion

17.	Multi disk clutches are dry clutches.
A.	Plasma clutches
B.	Wet clutches
C.	Yes
D.	Depends on the lubrication used
Answer» C. Yes

Discussion

18.	Centrifugal clutches are designed to provide automatic and smooth engagement of load to driving member?
A.	True
B.	False
Answer» B. False

Discussion

19.	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/mm¬¨¬®‚Äö√¢¬ß. 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
Answer» B. 32.4kW

Discussion

20.	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/mm¬¨¬®‚Äö√¢¬ß. 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
Answer» C. 334.53N-m

Discussion

21.	In a centrifugal clutch, the force with which the shoe presses against the driven member is the ___________ of the centrifugal force and the spring force.
A.	difference
B.	sum
C.	ratio
D.	none of the mentioned
Answer» B. sum

Discussion

22.	The axial force (W_e) required for engaging a cone clutch is given by
A.	W<sub>n</sub> sin ‚âà√≠¬¨¬±
B.	W<sub>n</sub> (sin ‚âà√≠¬¨¬± + ¬¨¬®¬¨¬µ cos ‚âà√≠¬¨¬± )
C.	W<sub>n</sub> (sin ‚âà√≠¬¨¬± + 0.25 ¬¨¬®¬¨¬µ cos ‚âà√≠¬¨¬± )
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

23.	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/mm¬¨¬®‚Äö√¢¬ß. Assuming uniform wear theory, calculate the operating force in the clutch.$
A.	15546N
B.	12344N
C.	23562N
D.	24543N
Answer» D. 24543N

Discussion

24.	The cone clutches have become obsolete because of
A.	small cone angles
B.	exposure to dirt and dust
C.	difficulty in disengaging
D.	all of the mentioned
Answer» E.

Discussion

25.	For a new friction lining, uniform wear theory is used.
A.	True
B.	False
Answer» C.

Discussion

26.	In case of a multiple disc clutch, if n₁ are the number of discs on the driving shaft and n₂ are the number of the discs on the driven shaft, then the number of pairs of contact surfaces will be
A.	n<sub>1</sub> + n<sub>2</sub>
B.	n<sub>1</sub> + n<sub>2</sub> ‚Äö√Ñ√∂‚àö√ë‚àö¬® 1
C.	n<sub>1</sub> + n<sub>2</sub> + 1
D.	none of the mentioned
Answer» C. n<sub>1</sub> + n<sub>2</sub> + 1

Discussion

27.	The jaw clutches show great amount of slip.
A.	Yes
B.	Zero slip
C.	Used in non-synchronous applications
Answer» C. Used in non-synchronous applications

Discussion

28.	The torque developed by a disc clutch is given by
A.	T = 0.25 ¬¨¬®¬¨¬µ.W.R
B.	T = 0.5 ¬¨¬®¬¨¬µ.W.R
C.	T = 0.75 ¬¨¬®¬¨¬µ.W.R
D.	T = ¬¨¬®¬¨¬µ.W.R
Answer» E.

Discussion

29.	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
Answer» C. Major part is achieved by friction

Discussion

30.	The material used for lining of friction surfaces of a clutch should have _____________ coefficient of friction.
A.	low
B.	high
C.	medium
D.	none of the mentioned
Answer» C. medium

Discussion

31.	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
Answer» C. It is a mechanical clutch

Discussion

32.	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
Answer» C. Both being temporary joints

Discussion

Explore topic-wise MCQs in Machine Design.

For a power screw having square threads with lead angle of 450 and coefficient of friction of 0.15 between screw and nut, the efficiency of the power screw, neglecting collar friction, is given by

Centrifugal clutches are designed to provide automatic and smooth engagement of load to driving member.

The axial force (We) required for engaging a cone clutch is given by

In case of a multiple disc clutch, if n1 are the number of discs on the driving shaft and n2 are the number of the discs on the driven shaft, then the number of pairs of contact surfaces will be

A jaw clutch is essentially a

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

FOR_A_POWER_SCREW_HAVING_SQUARE_THREADS_WITH_LEAD_ANGLE_OF_450_AND_COEFFICIENT_OF_FRICTION_OF_0.15_BETWEEN_SCREW_AND_NUT,_THE_EFFICIENCY_OF_THE_POWER_SCREW,_NEGLECTING_COLLAR_FRICTION,_IS_GIVEN_BY?$

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

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

In scooters, generally single plate clutches are used.

Multi disk clutches are dry clutches.

Centrifugal clutches are designed to provide automatic and smooth engagement of load to driving member?

In a centrifugal clutch, the force with which the shoe presses against the driven member is the ___________ of the centrifugal force and the spring force.

The axial force (We) required for engaging a cone clutch is given by

The cone clutches have become obsolete because of

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

In case of a multiple disc clutch, if n1 are the number of discs on the driving shaft and n2 are the number of the discs on the driven shaft, then the number of pairs of contact surfaces will be

The jaw clutches show great amount of slip.

The torque developed by a disc clutch is given by

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

The material used for lining of friction surfaces of a clutch should have _____________ coefficient of friction.

Eddy current clutch is a type of friction clutch.

Clutch and coupling perform the same action.

FOR_A_POWER_SCREW_HAVING_SQUARE_THREADS_WITH_LEAD_ANGLE_OF_45⁰_AND_COEFFICIENT_OF_FRICTION_OF_0.15_BETWEEN_SCREW_AND_NUT,_THE_EFFICIENCY_OF_THE_POWER_SCREW,_NEGLECTING_COLLAR_FRICTION,_IS_GIVEN_BY?$

The axial force (W_e) required for engaging a cone clutch is given by

In case of a multiple disc clutch, if n₁ are the number of discs on the driving shaft and n₂ are the number of the discs on the driven shaft, then the number of pairs of contact surfaces will be