Electrical Machines Practice Test 6

1. The relative speed between rotor and stator field is zero. This means ___________

2. Synchronous motors are ___________

3. In a synchronous machine, hunting is predominantly damped by __________

4. The supply voltage to an induction motor is decreased by 10%. By what percentage, approximately, will the maximum torque decrease?

5. An alternator with higher value of SCR has ____________

6. Which of the following is/are used in synchronous machines to maintain mechanical stability?

7. When a constant power output is desired to maintain ________

8. Which of the options given will have no effect on the working of the synchronous motor if ignored?

9. For a 4-pole 3 phase, 400V alternator has synchronizing power of 300 units. Then the synchronizing power per mechanical degree is?

10. Damper windings are made of ___________