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Basic Electrical Engineering: Electrical Machines
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Basic Electrical Engineering: Electrical Machines
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25 Questions

1. What is the displacement of the running and the starting windings used?
2. What are the names of the windings used in the split phase starting?
3. An 8-pole, 3-phase, 50 Hz induction motor is operating at a speed of 720 rpm. The frequency of the rotor current of the motor in Hz is __________
4. What is the range of the starting current of capacitor type induction motor?
5. What happens in the shaded pole starting method according to the displacement?
6. Calculate the active power in a 487 H inductor.
7. When is the repulsion motor starting method used?
8. The slope of the V-I curve is 5°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.
9. What are the names of the windings used in the split phase starting?
10. How many methods are present in the self starting of the single phase induction motor?
11. What is the specialty in the repulsion motor starting method?
12. How many methods are present in the self starting of the single phase induction motor?
13. What happens in the shaded pole starting method according to the displacement?
14. A three-phase slip ring induction motor is fed from the rotor side with the stator winding short-circuited. The frequency of the current flowing in the short-circuited stator is ____________
15. Calculate the moment of inertia of the thin spherical shell having a mass of 73 kg and diameter of 36 cm.
16. The slope of the V-I curve is 5°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.
17. Calculate the phase angle of the sinusoidal waveform z(t)=78sin(456πt+2π÷78).
18. What happens in the repulsion motor starting method?
19. What is the range of the starting torque of shaded pole induction motor?
20. How is the required phase displacement between the current in the running and starting windings obtained?
21. A 3-phase induction motor runs at almost 1000 rpm at no load and 950 rpm at full load when supplied with power from a 50 Hz, 3-phase supply. What is the corresponding speed of the rotor field with respect to the rotor?
22. What is the range of output watt for the shaded pole induction machine?
23. Calculate the moment of inertia of the disc having a mass of 54 kg and diameter of 91 cm.
24. What is the shaded pole starting method?
25. When is the repulsion motor starting method used?

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