GTU Switch Gear & Protection - June 2015 Exam Question Paper

GTU Electrical and Electronic Engineering (Semester 6)
Switch Gear & Protection
June 2015

Total marks: --
Total time: --

INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) Derive the necessary formula of Rate of Rise of Restriking Voltage [RRRV].

7 M

1 (b) Explain Construction, Working Principle and characteristics of HRC Fuse.

7 M

2 (a) Explain Construction, Working Principle of Vacuum circuit Breaker.

7 M

Answer any two question from Q2 (b) or Q2 (c)

2 (b) Explain Construction, Working with Advantages of Air Blast Circuit Breaker.

7 M

2 (c) Write a short note on Instrument Transformers.

7 M

Answer any two question from Q3 (a), (b) or Q3 (c), (d)

3 (a) Explain working principle of current transformer and potential transformer.

7 M

3 (b) Explain the ratio error and phase angle error of current transformer.

7 M

3 (c) Explain Balanced Beam type relay.

7 M

3 (d) Explain Different Characteristic of distance relay.

7 M

Answer any two question from Q4 (a), (b) or Q4 (c), (d)

4 (a) Difference between Static and Conventional [Electromagnetic] relay.

7 M

4 (b) Explain the faults and abnormalities of Generator. Explain Restricted Earth Fault Protection of Generator.

7 M

4 (c) Explain Buchholtz Relay protection.

7 M

4 (d) Explain Differential Protection and Biased differential Protection.

7 M

Answer any two question from Q5 (a), (b) or Q5 (c), (d)

5 (a) Explain Translay relay with necessary diagram.

7 M

5 (b) Explain method of Neutral Grounding Explain any two with Advantages.

7 M

5 (c) Explain function of Lightning Arrester. Explain Different types of Lightning Arrester.

7 M

5 (d) Explain Bus-bar Protection in Detail.

7 M

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