[nilesh]

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Can you provide me some questions for preparation of NTPC (National Thermal Power Corporation Limited) Electrical Engineering Interview?

[Vishal Kotkar]

Some questions for preparation of NTPC (National Thermal Power Corporation Limited) Electrical Engineering Interview are as follows:

1. What is the similarity between Induction motor and Transformer?

2. Explain about the B-H curve and its significance?

3. Design Full adder and Half Adder circuit?

4. What is Load torque and its significance in starting of Induction motor?

5. Why efficiency of thermal power plant is low (30-40%) ?

6. Why synchronous motor is not self starting motor ( prime mover is required to start)?

7. Why transformer core is laminated?

8. Why generation voltage is low (11kVto 33kV) why don't we generate power at 220kV?

9. Advantages of DC machines compared to AC machines?

10. In explosive and polluted environments which type of motors do we use?

11. What is snubber circuit?

12. Applications of cyclo-convertors?

13. Why we use low frequency (16 1/2 ) in traction applications?

14. What is Lead - Lag compensation?

15. Why secondary of CT should not be open?

16. What is the effect of harmonics on power system?

17. Advantages and disadvantages of Gauss seidel and Netwon rapson methods in solving load flow studies?

18. Which type of network cant be used for applying super-position theorem?

19. What is direct memory access?

20. What is electrical corona and methods to reduce the corona effect?

21. What is stiffnes?

22. What is the relation b/w the pole, frequency and speed of motor/ alternator?

23. Why Generator and Transformer rating in KVA but motor rating in KW?

24. What is the principle of thermal power station?

25. Why speed control of motor is better by thyristor ?

26. What is Plug setting multiplier and time setting multiplier in relays?

27. What is PI, PD and PID controllers and applications for all?