True or False 1Friction type clutches and brakes are the mos

True or False

1-Friction type clutches and brakes are the most common general purpose types.

2-Multiple-plate units product large amounts of torque in a small diameter.

3-Caliper units are also non-friction interface units.

4-Eddy-current clutches and brakes cannot perform at zero slip.

5-Precise control is a valuable, widely exploited nature of a hysteresis brake.

6-Square jaw clutches allow smooth, ramped engagement at speeds to 150 rpm in either direction.

7-The sprag clutch is bi-directional.

8-The roller-ramp clutch transmits torque through rollers that move on ramped-surface portions of a hub.

9-The disadvantage of mechanical actuation of clutches and brakes is the need for an operator.

10-Electric actuation should be considered where remote control is required or where special slip characteristics are needed.

Solution

1)

True, Friction type clutches and brakes are the most common general purpose types used.

2)

True, Multiple-plate unit’s product transmits large amounts of torque in a small diameter whereas single plate transmit small amount of torque.

Reason:

The increase in diameter is decrease the torque.

3)

False, calipers are friction interface unit which uses the pads to regulate the movement of the vehicle.

4)

True, Eddy-current clutches and brakes cannot perform at zero slip. Eddy current brakes must have slip between stator and rotor.

5)

True, precise control is a valuable, widely exploited nature of a hysteresis brake

6)

True, Square jaw clutches allow smooth, ramped engagement at speeds to 150 rpm in either direction.

Reason;

The satisfactory operation of jaw clutch depends on the accurate machining of teeth on two halves to ensure perfect contact.so it can easy to transmit power.

7)

True, the sprag clutch is bi-directional. Because it works on opposite direction also.

8)

True, the roller-ramp clutch transmits torque through rollers that move on ramped-surface portions of a hub.

9)

True, the disadvantage of mechanical actuation of clutches and brakes is the need for an operator.

10)

False, Electric actuation should be considered where remote control is required or where special slip characteristics are needed.