Switchgear Protections MCQ

  1. Bus coupler is very essential in arrangement ___.
  2. Magnetic circuit breaker has ______ trip action.
  3. In a circuit breaker the basic problem is to:
  4. What is the use of Air blast circuit breaker?
  5. Which of the following medium is employed for extinction of arc in air circuit breaker ?
  6. A fuse is never inserted in ____.
  7. Fault diverters are basically ____.
  8. By which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated ?
  9. Ionization in circuit breaker is facilitated by ___.
  10. Arc in a circuit breaker is interrupted at:
  11. What is the use of the delay fuses?
  12. Induction cup relay is operated due to changes in:
  13. Burden of a protective relay is the power ___.
  14. A balanced 3-phase system consists of ____.
Switchgear Protections MCQ

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  • single bus
  • double bus, double breaker
  • main and transfer bus
  • All of the above
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  • delayed
  • instantaneous
  • both of the above
  • None of the above
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  • maintain the arc
  • emit the ionizing electrons
  • extinguish the arc
  • transmit large power
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  • It is used for over currents.
  • It is used for short duty.
  • It is used for intermittant duty.
  • It is used for repeated duty.
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  • neutral wire
  • phase dine
  • positive of D.C. circuit
  • negative of D.C. circuit
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  • fuses
  • relays
  • fast switches
  • circuit breakers
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  • high temperature
  • increase of mean free path
  • increasing field strength
  • All of the above
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  • zero current
  • maximum current
  • minimum voltage
  • maximum voltage
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  • protection of motors
  • power outlet circuits
  • fluorescent lamps
  • light circuits
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  • current
  • voltage
  • impedance
  • All of the above
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  • required to operate the circuit breaker
  • absorbed by the circuit of relay
  • developed by the relay circuit
  • None of the above
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  • zero sequence currents only
  • zero, negative and positive sequence currents
  • negative and zero sequence currents
  • positive sequence currents only
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  • series
  • parallel
  • either in series or in parallel
  • None of the above
  • current wave only
  • voltage wave only
  • Both A and B
  • power factor wave only
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  • porcelain
  • electrolytic copper
  • aluminium alloy
  • copper tungsten alloy
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  • To regulate voltage and frequency
  • To switch power between different parts of the system
  • To protect equipment and personnel from electrical hazards
  • None of the above
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  • Oil-insulated switchgear
  • Air-insulated switchgear
  • Gas-insulated switchgear
  • Vacuum-insulated switchgear
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  • Oil circuit breaker
  • Air circuit breaker
  • Gas circuit breaker
  • Thermal circuit breaker
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  • Rotary switch
  • Toggle switch
  • Push button switch
  • Disconnect switch
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  • It is more reliable
  • It takes up less space
  • It is easier to maintain
  • It is less expensive than other types of switchgear
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