Electrical Machines Practice Test 5

1. Below is the phasor diagram of synchronous generator.

If the machine is made to run as synchronous motor, what will be the new phasor diagram?

2. For a 3 phase synchronous generator of terminal voltage as 1 pu and field excitation of 1 pu. If the resistive drop is 0.2 pv, then what can be concluded for power factor?

3. The internal power factor angle is given for a lagging load of a 3- phase alternator.

4. Potier method is very accurate due to __________

5. The armature current is ________ at UPF when compared to leading power factor for a motor.

6. For a 3 phase synchronous generator of terminal voltage as 1 pu and field excitation of 1.2 pu. If the resistive drop is 0.2 pv, then what can be concluded for power factor?

7. A 315V, 3-phase 400 MVA alternator is running at lagging power factor at constant excitations. The most appropriate representation in space domain is?

8. Synchronous motor delivers lagging power at __________

9. Under the conditions of maximum reactive power output, the reactive power flowing out of an alternator is __________

10. An alternator, with synchronous reactance of 0.8 pv is connected to an IBB at rated voltage. With its excitation emf adjusted to 1.3 pv, the alternator delivers an output of 0.5 pv. The load angle is __________