Switchgear and Protection Objective Type Questions and Answers

Questions

21 Induction cup relay is operated due to changes in

A Current

B Voltage

C Impedance

D All Of The Above

View Answer

Answer: All Of The Above

22 Which of the following statements is incorrect ?

A Lightning arrestors are used before the switchgear

B Shunt reactors are used as compensation reactors

C The peak short current is (1.8 xV2) times the A.C. component

D The MVA at fault is equal to base MVA divided by per unit equivalent fault reactance

View Answer

Answer: Lightning arrestors are used before the switchgear

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23 Bus coupler is very essential in arrangement

A Single Bus

B Double Bus, Double Breaker

C Main And Transfer Bus

D None of the above

View Answer

Answer: Main And Transfer Bus

24 For cost and safety, the outdoor substations are installed for voltages above

A 11 kV

B 33 kV

C 60kV

D 110kV

View Answer

Answer: 33 kV

25 Distance relays are generally

A Split-Phase Relays

B Reactance Relays

C Impedance Relays

D None Of The Above

View Answer

Answer: None Of The Above

26 A _______ is used to measure the stator % winding temperature of the generator.

A Thermocouple

B Pyrometer

C Resistance Thermometer

D Thermometer

View Answer

Answer: Resistance Thermometer

27 The relay with inverse time characteristic will operate within

A 1.5 sec

B 5 to 10 sec

C 5 to 20 sec

D 20 to 30 sec

View Answer

Answer: 5 to 10 sec

28 Which of the following devices will receive voltage surge first travelling on the transmission line ?

A Lightning arresters

B Relays

C Step-down transformer

D Switchgear

View Answer

Answer: Lightning arresters

29 Series reactors should have

A low resistance

B high resistance

C low impedance

D All Of The Above

View Answer

Answer: low resistance

30 Arc in a circuit breaker is interrupted at

A zero current

B maximum current

C minimum voltage

D maximum voltage

View Answer

Answer: zero current

31 What will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ?

A Zero

B Unity

C Infinity

D None of the above

View Answer

Answer: Zero

32 Over voltage protection is recommended for

A hydro-electric generators

B steam turbine generators

C gas turbine generators

D all of the above

View Answer

Answer: all of the above

33 Overfluxing protection is recommended for

A distribution transformer

B generator transformer of the power plant

C auto-transformer of the power plant

D station transformer of the power plant

View Answer

Answer: generator transformer of the power plant

34 Admittance relay is _______ relay.

A Impedance

B Directional

C Non-Directional

D None Of The Above

View Answer

Answer: Directional

35 The material used for fuse must have

A low melting point and high specific resistance

B low melting point and -low specific resistance

C high melting point and low specific resistance

D low melting point and any specific resistance

View Answer

Answer: low melting point and high specific resistance

36 The steady state stability of the power system can be increased by

A connecting lines in parallel

B connecting lines in series

C using machines of high impedance

D all of the above

View Answer

Answer: connecting lines in parallel

37 A fuse is connected

A either in series or in parallel with circuit

B in parallel with circuit

C in series with circuit

D None Of The Above

View Answer

Answer: in series with circuit

38 A fuse is never inserted in

A neutral wire

B negative of D.C. circuit

C positive of D.C. circuit

D None Of The Above

View Answer

Answer: neutral wire

39 A switchgear is device used for

A interrupting an electrical circuit

B switching an electrical circuit 111

C switching and controlling an electrical circuit

D switching, controlling and protecting the electrical circuit and equipment

View Answer

Answer: interrupting an electrical circuit

40 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 None Of The Above

View Answer

Answer: Conduction

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