Friction Clutches Multiple Choice Questions - ObjectiveBooks

# Friction Clutches Objective Practice Test

1. The friction moment in a clutch with uniform wear as compared to friction moment with uniform pressure is
(A) More
(B) Equal
(C) Less
(D) More or less depending on speed

2. The clutch used in scooters is
(A) Multi-plate clutch
(B) Single plate clutch
(C) Centrifugal clutch
(D) Cone clutch

3. The commonly used angle between leather or asbestos friction lining surface and axis of cone clutch for a cone clutch is
(A) 14.5°
(B) 20°
(C) 12.5°
(D) 45°

4. In the running condition, the net force acting on the drum of centrifugal clutch is equal to
(A) The centrifugal force on shoe
(B) The centrifugal force on shoe minus spring force
(C) The centrifugal force on shoe plus spring force
(D) The spring force

5. In case of multi-plate clutch if n1 is number of disks on driving shaft and n2 is the number of disks on driven shaft, then the number of pairs of contacting surfaces is given by
(A) n1 + n2
(B) n1 + n2 + 1
(C) n1 + n2 - 1
(D) n1 + n2 - 1

6. A jaw clutch is
(A) Friction clutch
(B) Disk clutch
(C) Positive action clutch
(D) Cone clutch

7. The friction material of the clutch should have
(A) High coefficient of friction
(B) Low coefficient of friction
(C) High surface hardness
(D) High endurance limit strength

8. The torque transmitted by single plate clutch, working on uniform wear criterion, is given by,

Where, µ = coefficient of friction, P = axial force required to hold the friction surfaces together, Rmin = mean radius of friction surfaces

(A) 0.25 µ P Rmin
(B) 0.50 µ P Rmin
(C) 0.75 µ P Rmin
(D) µ P Rmin

9. In case of multi-disk clutches, oil is used,
(A) To reduce the friction
(B) To carry away the heat
(C) To lubricate the contacting surfaces
(D) For all above functions

10. The friction radius for new clutch compared to worn out clutch will be
(A) More
(B) Equal
(C) Less
(D) More or less depending on size of clutch

11. In the beginning of engagement of a centrifugal clutch,
(A) The centrifugal force on shoe is slightly more than spring force
(B) The centrifugal force on shoe is equal to spring force
(C) The centrifugal force on shoe is less than spring force
(D) None of the above

12. In case of single plate new clutches and brakes, the friction radius is equal to

Where, ‘D’ and ‘d’ are outer and inner diameters of friction lining respectively.

(A) ⅓ [(D3 - d3)/(D2 - d2)]
(B) ½[(D3 - d3)/(D2 - d2)]
(C) ¼ [(D3 - d3)/(D2 - d2)]
(D) ¼ (D + d)

13. In case of single plate worn out clutches and brakes, the friction radius is equal to

Where, ‘D’ and ‘d’ are outer and inner diameters of friction lining respectively.

(A) ⅓ [(D3 - d3)/(D2 - d2)]
(B) ½[(D3 - d3)/(D2 - d2)]
(C) ¼ [(D3 - d3)/(D2 - d2)]
(D) ¼ (D + d)

14. The clutch used in trucks is
(A) Centrifugal clutch
(B) Cone clutch
(C) Multi-plate clutch
(D) Single plate clutch

15. In case of cone clutch, a relatively small axial force can transmit a given torque, if the semi-cone angle is
(A) More
(B) Equal
(C) Less
(D) More or less depending on size of

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