Power System Protection MCQs Part 22

Power System Protection MCQs Part 22

Buchholz relays are used for transformers having ratings above

Buchholz relays are used for transformers having ratings above:

  1. 100 kV
  2. 200 kV
  3. 500 kV
  4. 1000 kV

Correct answer: 3. 500 kV

The condition which causes transient instability in power system

The condition which causes transient instability in power system:

  1. Loss of excitation in generator
  2. Short circuit
  3. Switching operations on line
  4. All of these

Correct answer: 4. All of these

The primary type of failure in wind power generation is in

The primary type of failure in wind power generation is in:

  1. Aerodynamic system
  2. Electrical system
  3. Mechanical system
  4. Both 2 and 3

Correct answer: 1. Aerodynamic system

Differential relays are installed for protecting equipment against

Differential relays are installed for protecting equipment against:

  1. Overcurrent
  2. Reverse current
  3. Internal faults
  4. No voltage

Correct answer: 3. Internal faults

The value of the reheat factor is of the order of

The value of the reheat factor is of the order of

  1. 0.8 to 1.0
  2. 1.0 to 1.05
  3. 1.1 to 1.5
  4. 1.5 to 10

Correct answer: 3. 1.1 to 1.5

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