Download GTU BE/B.Tech 2018 Winter 8th Sem New 2180901 Testing And Commissioning Of Electrical Equipments Question Paper

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Subject Code: 2180901

GUJARAT TECHNOLOGICAL UNIVERSITY

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Instructions:

1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. 1. What is testing of electrical equipments? Classify different tests. [03]

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   2. What is polarization index? State its importance. [04]
   3. What is difference between equipment earthing and system grounding? [07]
2. 1. Explain earthing procedure for substation. [03]
   2. State the importance of polarity test for transformer. [04]

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   3. Explain insulation resistance measurement for power transformer. [07]
3. 1. Explain any two troubles in three phase induction motor with their causes and remedies. [07]
   OR
   1. Explain Hopkinson’s test with its circuit diagram. [07]

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4. 1. What are clearance and creepage? [03]
   2. Explain any one method for alignment of rotating electrical machine. [04]
   3. Explain earth resistance measurement with usual connection diagram. [07]
   OR
   1. Explain slip measurement using galvanometer. [03]
   2. Explain power frequency HV test on three phase induction motor. [04]

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   3. Explain drying out procedure for power transformer. Also show the insulation resistance variation during drying out with respect to time. [07]
5. 1. Explain the polarity measurement of current transformer. [03]
   2. Can Dy1 connected in parallel with Dy11? Justify your answer. [04]
   3. Explain routine maintenance procedure for a power transformer. [07]

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   OR
   1. What is technical report? Show any sample technical report in sheet form. [03]
   2. Enlist the different protection schemes for synchronous generator. [04]
   3. Explain the commissioning procedure of synchronous generator. [07]
6. 1. Enlist the different types of conductor used for transmission line. [03]

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   2. Write short note on gas insulated substation. [04]
   3. What is tower footing resistance? Explain any one method to reduce the value of tower footing resistance. [07]
   OR
   1. Give difference between isolator and circuit breaker. [03]
   2. Explain mechanical endurance test for switchgear. [04]
   3. Explain any two routine tests to be performed on circuit breaker. [07]

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