Power System Protection MCQ Part 1

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Power system protection MCQ questions Part 1. Electrical Engineering MCQ Questions with answer on power system protection.

In a circuit breaker the arcing contacts are made of which material

In a circuit breaker the arcing contacts are made of which material:

  1. Porcelain
  2. Tungsten alloy
  3. Electrolytic copper
  4. All of these

Correct answer: 2. Tungsten alloy

The Arcing contacts in a circuit breaker are designed in such as manner so as to prevent the main contacts from being damaged. The arcing contacts in a circuit breaker are made from tungsten alloys, cadmium and zinc. Usage of these materials make the arcing contacts harder. As a result of this when the contacts open and close they will not deteriorate as quickly.

Internal faults on the transformer arise from

Internal faults on the transformer arise from:

  1. Overheating
  2. Mechanical injury
  3. Both of these
  4. None of these

Correct answer: 3. Both of these

The major function of a fuse is to

The major function of a fuse is to:

  1. Open the circuit
  2. Prevent excessive currents
  3. Both of these
  4. None of these

Correct answer: 3. Both of these

Which of the following is the correct statement about SF6 gas

Which of the following is correct statement about SF6 gas:

  1. It is yellowish green in color
  2. It is nontoxic gas
  3. Is lighter than air
  4. All of these

Correct answer: 2. It is nontoxic gas

Time current characteristics of a Fuse

A fuse exhibits ________ time current characteristics:

  1. Inverse
  2. Direct

Correct answer: 1. Inverse

A fuse performs

A fuse performs:

  1. Detection function only
  2. Interruption function only
  3. Both of these
  4. None of these

Correct answer: 3. Both of these

Generally the main contacts of circuit breaker are constructed of

Generally the main contacts of circuit breaker are constructed of:

  1. Softer alloy
  2. Harder alloy

Correct answer: Since the main contacts of a circuit breaker have to carry the main load current, they are constructed of a softer alloy that uses less tungsten and more silver so as to keep resistance low.

Relays can be actuated by which of the below mentioned quantities

Relays can be actuated by which of the below mentioned quantities:

  1. Magnitude
  2. Frequency
  3. Phase angle
  4. All of these

Correct answer: 4. All of these

Induction relays can be used with dc quantities

Induction relays can be used with dc quantities:

  1. True
  2. False

Correct answer: False

In a circuit breaker the process of Ionization is facilitated by

In a circuit breaker the process of Ionization is facilitated by:

  1. High temperature
  2. Increasing field strength
  3. Both of these
  4. None of these

Correct answer: 3. Both of these

More PSP MCQ

  1. Power System Protection MCQ Part 1
  2. Power System Protection MCQ Part 2
  3. Power System Protection MCQ Part 3
  4. Power System Protection MCQ Part 4
  5. Power System Protection MCQ Part 5
  6. Power System Protection MCQ Part 6
  7. Power System Protection MCQ Part 7
  8. Power System Protection MCQ Part 8
  9. Power System Protection MCQ Part 9
  10. Power System Protection MCQ Part 10

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