Electric Braking of DC Motor

Which of the following is the best braking method?

• Electric braking

• Friction

• Electromechanical action

• Eddy-currents

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

• Eddy current

• Plugging or counter-current

• Dynamic or rheostatic

• Regenerative

Which of the following is the plugging method of braking?

• Reversal of armature connections

• Reversal of field connections

• Addition of equal and opposite field

• Removal of field circuit from current machine circuit

Electrical braking of any variety becomes less effective as ___________

• Speed decreases

• Speed increases

• Independent of speed

• Depends on supply voltage

If the terminals of armature of D.C. motor are interchanged, this action will offer following kind of braking

• Plugging

• Regenerative

• Dynamic

• None of this

Which DC motor has approximately constant speed?

• Shunt motor

• Series motor

• Cumulatively compound motor

• All of the above

Braking time in the dynamic braking is the function of _____________

• All- system inertia, load torque and motor rating

• System inertia

• Load torque

• Motor rating

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

• Generator

• Freely running machine

• Motor with slow speed

• 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

Which of the following is dynamic braking?

• Removal of armature circuit from current machine circuit

• Addition of equal and opposite field

• Reversal of armature connections

• Reversal of field connections