Electrical Machines Practice Test 7

1. A synchronous machine is operating at constant load and at unity power factor. If its excitation is increased, then it operates as ___________

2. Mark the correct waveform for the emf produced in an induction motor and the resultant flux density wave for a resistive load.

3. Synchronous motor has been preferred for driving the loads requiring high power at low speeds.

4. In an induction motor, when the number of stator slots is equal to an integral multiple of rotor slots?

5. The rotor of th 3-phase induction motor rotates in the same direction as that of stator field. This can be explained by _________

6. The squirrel cage induction motor of 6-pole can be used as ________ induction motor.

7. The no load current of the transformer is very less due to _________

8. A 3-phase, 6-pole, 50 Hz induction motor has a full load speed of 960 rpm with its slip rings short circuited. The motor drives the constant load. If the speed is reduced to 800 rpm, then ohmic losses will be?

9. For a slip ring induction motor having leakage impedance of (1+j), the maximum generated emf would be attained at _________

10. Mark the most appropriate phasor for the induction machine operation as motor.