Quiz : AC Braking

Which of the following is the best braking method?

• Electric braking

• Friction braking

• Mechanical braking

• Eddy-currents braking

Common electrical drives operating in ___________ quadrant.

• First quadrant

• Second quadrant

• Fourth quadrant

• All four quadrant

Choose (all) the methods of braking for a AC motor

• Dynamic braking

• Forward Motoring braking

• Regenerative braking

• Countercurrent braking

• Reverse motoring braking

Which type of braking is highly efficient in energy saving ?

• dynamic

• plugging

• regenerative

• countercurrent

Introducing the external resistance to the rotor circuit will decreases :

(i) speed

(ii) output power

(iii) starting torque

• (iii) only

• (ii) & (iii)

• (i) & (ii)

• (i), (ii), (iii)

The purposes of braking AC motors are .................

• Preventing from over speeding

• Holding the shaft

• To increase motor speed over rated limit

• Rapid stopping

Which of the following is not the method of electrical braking?

• Eddy current

• Plugging or counter-current

• Dynamic or rheostatic

• Regenerative

Braking of DC motor includes all the following operation EXCEPT...

• Stopping the motor

• Holding shaft at specific position

• Maintaining speed

• Changing the frequency

In dynamic braking, when braking is applied, machine acts as _________

• Motor with slow speed

• Freely running machine

• Generator

• Motor with same speed in opposite direction

In which of the following electrical braking method, energy is supplied back to the supply?

• Regenerative braking

• Plugging

• Dynamic braking

• In all electrical braking