Switchgear & Protection Imp Qusts – SP Important Questions

Switchgear & Protection Imp Qusts Pdf file – SP Important Questions

Please find the attached pdf file of Switchgear & Protection Important Questions Bank – SP Imp Qusts

Link – SP Question Bank

UNIT-I
CIRCUIT BREAKER-1

1. What is a circuit breaker ? Explain its functions.
2. Discuss the arc phenomenon in a circuit breaker
3. Define the following terms as applied to circuit breakers : (i) Arc voltage (ii) Re striking voltage (iii) Recovery voltage

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UNIT-II
CIRCUIT BREAKER-2

1. Discuss the advantages and disadvantages of oil circuit breakers
2. Explain the difference between bulk oil circuit breakers and low-oil circuit breakers
3. Explain the terms (i) symmetrical breaking current (ii) Asymmetrical breaking current(iii) making current

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UNIT-III
ELECTROMAGNETIC AND STATIC RELAYS

1. What is the difference between a fuse and a relay ?
2. What is the difference between an over current relay and current differential relay ?
3. Why are differential relays more sensitive than over current relays?

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UNIT-1V
GENERATOR PROTECTION

1. Why is overload protection not necessary for alternators?
2. What are the types of stator winding faults in alternator?
3. Mention the most commonly used protection scheme for alternators

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UNIT-V
TRANSFORMER PROTECTION

1. How many faults develop in a power transformer?
2. Discuss the different transformer faults
3. What are the various protections usually recommended for power transformers?

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