Power System Protection MCQs Part 1

a. The production of arc in circuit breaker:

  1. Delays the current interruption process
  2. Generates enormous heat
  3. Both of these
  4. None of these

Correct answer: 3. Both of these

b. The basic requirement of any power system protection scheme is:

  1. Selectivity
  2. Stability
  3. Speed
  4. All of these

Correct answer: 4. All of these

c. The incipient fault in beginning is:

  1. Small
  2. Fatal
  3. Infinitely damage to the equipment
  4. more dangerous than P – P fault

Correct answer: 1. Small

d. Most dangerous type of fault on any power system is:

  1. Phase to earth
  2. Phase to Phase
  3. Phase to Phase to Earth
  4. Three phase fault

Correct answer: 3. Three phase fault

e. Reactance in any system exists due to:

  1. Resistors
  2. Capacitors
  3. Inductors
  4. 2 & 3

Correct answer: 4. 2 & 3

f. Cartridge type fuse can handle current upto:

  1. 50,000 A
  2. 1,00,000 A
  3. 2,00,000 A
  4. 5,00,000 A

Correct answer: 2. 1,00,000 A

g. The major advantage associated with the fuse is:

  1. It is cheaper to use
  2. It requires no special maintenance
  3. Its time or operation is shorter than CB’s
  4. All of these

Correct answer: 4. All of these

h. The modern electrical power systems are more likely to use:

  1. Electromechanical relays
  2. Static analog relays
  3. Static digital relays
  4. None of these

Correct answer: 3. Static digital relays

i. Air circuit breakers can be used for current values up to:

  1. 3000 A
  2. 6000 A
  3. 9000 A
  4. 18000 A

Correct answer: 2. 6000 A

j. The protection system which compares the current entering and leaving the protection zone:

  1. Different protection system
  2. Integral protection system
  3. Back protection system
  4. Subtraction protection system

Correct answer: 1. Different protection system

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