DAE 3rd Year Past Paper 2019 ELECTRICAL TECHNOLOGY

THIRD YEAR
ET-335 TRANSMISSION DISTRIBUTION AND PROTECTION OF ELECTRICAL POWER SYSTEMS

(ELECTRICAL TECHNOLOGY)

PAPER 'B' PART B
SECTION- I
Marks 80

Q.1 Write short answers to any Twenty five (25) of the following questions: 25x 2 50
1.Define striking voltage
2. Why SF6 Gas is used in circuit breaker
3. Define oil circuit breaker
4. Define necessity of reactors
5. Define a blast osuit breaker
6. Define recovery voltage of circuit breaker
7. In which condition, an isolator is used
8. What is line to ground fault
9. Enlist uses of insulators
10. Draw the diagram of line to line fault
11. What do you mean by switch gear
12. Define relay
13. Enlist the types of Electromagnetic relay
14. Why we use circuit breaker
15. Define instantaneous relay
16. Define differential relay.
17. What is meant by pole slipping of Alternators
18. Enlist the names of Mechanical faults of Alternators
19. What is the Ring Main system
20. Defirie Rod Gap Ariester
21. Enlist the types of Lightning strikes:
22. What is meant by motoring action of Automatons.۔
23. What is Arc
24. Wittree Busbar fauts
25. What is a factor
26. Write two dielectric properties of SF8 gas
27. Define the fusing factor
28. What is the difference between an isolator and busbar isolator
29. Define current chopping
30. Define primary protection
31. Enlist the names of any four parts of vacuum circuit breaker
32. How vacuum is produced in vacuum circuit breaker
33. What is current grading over current protection
34. Enlist the properties of fuse element
35. Define zone of protection.
36. How balanced beam relay works.
37. Write three busbar faults.

SECTION-I

NOTE: ATTEMPT ANY THREE QUESTIONS 3 x 10 = 30

Q.2 Define circuit breaker Explain construction and working of Cross bluestar circuit breaker with diagram.
Q.3 Explain Arc Quenching phenomenon in SF6 circuit breaker
Q.4 Explain construction and working principal of Buchholz relay with help of diagram
Q.5 Explain merz-price system of Alternator Protection
Q.6 Write a short note on the following
(a) Indirect stroke of lightening
(b) Rotor faults of Alternator.

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