Download PTU B.Tech 2021 Jan EE 7th Sem 74091 Power System Ii Switch Gear And Protection Question Paper

Roll No. Total No. of Pages : 02

Total No. of Questions: 18

B.Tech. (EE) PT (Sem.-7)

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POWER SYSTEM-II (Switch Gear & Protection)

Subject Code: BTEE-602

M.Code: 74091

Time : 3 Hrs. Max. Marks : 60

INSTRUCTIONS TO CANDIDATES :

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1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

Write briefly:

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1. What do you mean by a static relay?
2. What are the duties performed by a Circuit breaker?
3. What is meant by back up protection?
4. Define the term "fusing factor" related to fuse.
5. What are the functions of a protective relay?

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6. What are the uses of a Buchholz's relay?
7. What do you understand by RRRV?
8. Mention any two applications of differential relays.
9. What do you understand by pick up value of a relay?
10. What are the advantages of air blast circuit breakers over oil circuit breakers?

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SECTION-B

11. Discuss various types of faults in Alternators. Explain Loss of excitation protection in Generators.
12. Describe the operation of a HRC cartridge fuse.
13. Classify various types of substations. Compare indoor and outdoor types of substations.
14. Explain briefly following terms related to CBs with the help of some diagram :
    1. Arc voltage

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    2. Restriking voltage
15. Discuss the Time graded protection of feeders.

SECTION-C

16. Write a note on following :
    1. Negative sequence relay

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    2. Carrier current protection of lines.
17. With the help of a neat sketch, describe the working of vacuum circuit breakers.
18. Write a note on following:
    1. Reactance Relays
    2. Ground wires

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NOTE: Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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