BHEL electrical Interview questions

BHEL electrical questions:

BHEL interview questions are listed below.

1. Explain about the Torque-speed and Torque-Slip Characteristics of Induction motor?

2. Methods to improve the power factor of Induction motors?

3. Conditions to operate transformers in parallel?

4. Why power transformers are designed for maximum efficiency at full load?

5. Resolve EX-oR gate using Universal gates (nand or nor)?

6. What is the use of capacitor in single phase Induction motor?

7. Explain about the 'V' and inverted 'V' curves of synchronous motor?

8. What is power system stability?

9. Explain about different switching schemes employed in power plant (busbar arrangements)?

10. What is step potential and touch potential?

11. What is string efficiency of insulators?

12. What is electrical corona? conditions that affect the corona?

13. What is surge impedance loading of a line? What happen when load of line is equal to surge impedance loading?

14. Why we use test signals in control systems to find the response of the system?

15. Explain P, I, PI, PD, PID controllers?

16. Differences  open loop and closed loop system

17. What is demand factor, load factor, load curve?

18. How speed of dc shunt motor can be controlled?

19. Different braking methods of dc motor?

20. Applications where dc motors out rule the ac motors?

21. what is the difference between micro processor and micro controller?