Power System Protection MCQs Part 25

Electrical Engineering MCQs on Power System Protection

A differential relay measures vector difference between

A differential relay measures vector difference between

  1. Two currents
  2. Two or more similar electrical quantities
  3. Two voltages
  4. None of the above

Correct answer: 2. Two or more similar electrical quantities

Protective relays are devices that detect abnormal conditions in electrical circuits by assessing

Protective relays are devices that detect abnormal conditions in electrical circuits by assessing

  1. Constantly the electrical quantities which differ during normal and abnormal conditions
  2. Current during abnormal condition
  3. Voltage during abnormal condition
  4. None of these

Correct answer: 1. Constantly the electrical quantities which differ during normal and abnormal conditions

Shunt capacitance is neglected in case of

Shunt capacitance is neglected in case of

  1. Long transmission line
  2. Medium and long transmission lines
  3. Medium transmission line
  4. Short transmission line

Correct answer: 4. Short transmission line

A switchgear is used for

A switchgear is used for

  1. Interrupting an electrical circuit
  2. Switching an electrical circuit
  3. Switching and controlling an electrical circuit
  4. Switching, controlling and protecting the electrical circuit and equipment

Correct answer: 4. Switching, controlling and protecting the electrical circuit and equipment

Insulation resistance of high voltage circuit breakers is greater than

Insulation resistance of high voltage circuit breakers is greater than

  1. 1 mega ohms
  2. 10 mega ohms
  3. 100 mega ohms
  4. 500 mega ohms

Correct answer: 3. 100 mega ohms

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