Switchgear Protections MCQ

Switchgear Protections MCQ

  • Admin
  • 09th Jan, 2023

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Practice here the best Switchgear Protections MCQ Questions to brush up your skills. This Switchgear Protections MCQ Test contains 25+ Multiple Choice Questions. Apart from this, you can also download Switchgear Protections MCQ PDF completely free.

Switchgear Protections MCQ

1) Bus coupler is very essential in arrangement ___.

  • A. single bus
  • B.double bus, double breaker
  • C.main and transfer bus
  • D.All of the above

2) Magnetic circuit breaker has ______ trip action.

  • A. delayed
  • B.instantaneous
  • C.both of the above
  • D.None of the above

3) In a circuit breaker the basic problem is to:

  • A. maintain the arc
  • B.emit the ionizing electrons
  • C.extinguish the arc
  • D.transmit large power

4) What is the use of Air blast circuit breaker?

  • A. It is used for over currents.
  • B.It is used for short duty.
  • C.It is used for intermittant duty.
  • D.It is used for repeated duty.

5) Which of the following medium is employed for extinction of arc in air circuit breaker ?

  • A. Water
  • B.Oil
  • C.Air
  • D.SF6

6) A fuse is never inserted in ____.

  • A. neutral wire
  • B.phase dine
  • C.positive of D.C. circuit
  • D.negative of D.C. circuit

7) Fault diverters are basically ____.

  • A. fuses
  • B.relays
  • C.fast switches
  • D.circuit breakers

8) By which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated ?

  • A. Radiation
  • B.Convection
  • C.Conduction
  • D.All of the above

9) Ionization in circuit breaker is facilitated by ___.

  • A. high temperature
  • B.increase of mean free path
  • C.increasing field strength
  • D.All of the above

10) Arc in a circuit breaker is interrupted at:

  • A. zero current
  • B.maximum current
  • C.minimum voltage
  • D.maximum voltage

11) What is the use of the delay fuses?

  • A. protection of motors
  • B.power outlet circuits
  • C.fluorescent lamps
  • D.light circuits

12) Induction cup relay is operated due to changes in:

  • A. current
  • B.voltage
  • C.impedance
  • D.All of the above

13) Burden of a protective relay is the power ___.

  • A. required to operate the circuit breaker
  • B.absorbed by the circuit of relay
  • C.developed by the relay circuit
  • D.None of the above

14) A balanced 3-phase system consists of ____.

  • A. zero sequence currents only
  • B.zero, negative and positive sequence currents
  • C.negative and zero sequence currents
  • D.positive sequence currents only

15) Admittance relay is directional relay.

  • A. True
  • B.False

16) The voltage appearing across the contacts after opening of the circuit breaker is called______ voltage.

  • A. surge
  • B.arc
  • C.recovery
  • D.operating

17) A fuse is connected in __ with circuit.

  • A. series
  • B.parallel
  • C.either in series or in parallel
  • D.None of the above

18) When a transmission line is energized, the wave that propagates on it is:

  • A. current wave only
  • B.voltage wave only
  • C.Both A and B
  • D.power factor wave only

19) Is A thermal protection switch can protect against overload?

  • A. Yes
  • B.No

20) Which material is used to made the arcing contacts in a circuit breaker ?

  • A. porcelain
  • B.electrolytic copper
  • C.aluminium alloy
  • D.copper tungsten alloy

21) What is the primary function of switchgear in a power system?

  • A. To regulate voltage and frequency
  • B.To switch power between different parts of the system
  • C.To protect equipment and personnel from electrical hazards
  • D.None of the above

22) What type of switchgear is used for high voltage transmission and distribution?

  • A. Oil-insulated switchgear
  • B.Air-insulated switchgear
  • C.Gas-insulated switchgear
  • D.Vacuum-insulated switchgear

23) Which of the following is NOT a type of circuit breaker used in switchgear?

  • A. Oil circuit breaker
  • B.Air circuit breaker
  • C.Gas circuit breaker
  • D.Thermal circuit breaker

24) What type of switch is commonly used for switching high voltage power in switchgear?

  • A. Rotary switch
  • B.Toggle switch
  • C.Push button switch
  • D.Disconnect switch

25) What is the main advantage of air-insulated switchgear?

  • A. It is more reliable
  • B.It takes up less space
  • C.It is easier to maintain
  • D.It is less expensive than other types of switchgear

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