DC Motors MCQs

A 200V, 2000 rpm, 10A, separately excited de motor has an armature resistance of 20. Rated dc voltage is applied to both the armature and field winding of the motor. If the armature drawn 5A from the source, the torque developed by the motor is

The speed/torque regimes in a de motor current, possible burning it and the control methods suitable for the in Group II possibly destroying armature due to and Group I excessive centrifugal stresses Group I Group II

The armature resistance of a permanent torque.magnet dc motor is 0.8 L. At no load, the

A 8 pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

A 50 kW dc shunt motor is loaded to draw rated armature current at any given speed. When driven (i) at half the rated speed by armature (ii) at 1.5 times the rated speed by field

If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens

D.C. series motors are used

Sparking at the commutator of a D.C.will be

As compared to an induction motor, the air gap in a D.C. motor is