power-system-protection-mcqs-part-6

Power System Protection MCQs Part 6

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a. The component which provides a signal to circuit breaker under the fault condition:

  1. Isolator
  2. Fuse
  3. Relay
  4. CT

Correct answer: 3. Relay

b. A definite time relay is ___________ the amount of current:

  1. Dependent on
  2. Independent of

Correct answer: 2. Independent of

c. The extent of damage and injuries caused due to a shock depends on:

  1. Amount of current
  2. Path of the current
  3. Time for which current flows
  4. All of these

Correct answer: 4. All of these

d. Problem: Usually, the overvoltage alternator results due to sudden load variation.

Solution: The over-voltage protection system is installed on all power stations.

  1. The solution is used to solve the problem
  2. Problem is correct but the solution is not always applied
  3. Both solution and problem misfit the context
  4. The problem never happens on alternators

Correct answer: 2. Problem is correct but the solution is not always applied

Explanation: The over-voltage protection system is only installed on those power stations where there is no attendee.

e. Backup protection is installed to:

  1. Increase the protection reliability of the system
  2. To increase the speed of protection system
  3. Both of these
  4. None of these

Correct answer: 1. Increase the protection reliability of the system

f. The correct statement about the cross-section area of the arc and the resistance:

  1. The arc resistance increases with the increase of cross-section area
  2. The arc resistance increases with the decrease of cross-section area
  3. Both are not related to other
  4. None of above

Correct answer: 2. The arc resistance increases with the decrease of cross-section area

g. The breaking capacity of the circuit breaker is in _______ and is measured in ________:

  1. R.M.S, kVA
  2. R.M.S, MVA
  3. Peak, kVA
  4. Peak, MVA

Correct answer: 2. R.M.S, MVA

h. The correct statement about the arc in circuit breaker:

  1. It is desired to extinguish the arc as quickly as possible
  2. Delays the current interruption process
  3. Generates enormous heat
  4. All of these
    Correct answer: 4. All of these

i. Arc extinction is achieved in the air circuit breaker by using:

  1. Air
  2. Oil
  3. SF6
  4. None of these

Correct answer: 1. Air

j. Semi-open cartridge type fuse can handle current up to ___________:

  1. 1000 A
  2. 2500 A
  3. 4000 A
  4. 10000 A

Correct answer: 3. 4000 A

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