DC MOTOR - Quiz

1) Which DC compound motor is operated at constant speed under varying load?

Differential long shunt Cumulative long shunt Differential short shunt Cumulative short shunt

2) How No volt coil is connected in a three point starter with DC shunt motor?

Directly connected to supply Connected in series with armature Connected in parallel with armature Connected in series with shunt field

3) Which speed control method is applied to obtain both below normal and above normal speed in DC motor?

Field control method Armature control method Tapped field speed control Ward Leonard speed control

4) Why commutators are sparking heavily?

Incorrect brush position Incorrect field connection Incorrect direction of rotation Incorrect armature connection

5) What is the action of the induced emf in a running D.C motor?

Assists the applied voltage Opposes the applied voltage Increases the armature current Decreases the armature current