Related Topics

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page-19  Multiple Choice Question (MCQ) of Measurements page-18  Multiple Choice Question (MCQ) of Measurements page-17  Multiple Choice Question (MCQ) of Measurements page-16  Multiple Choice Question (MCQ) of Measurements page-15  Multiple Choice Question (MCQ) of Measurements page-14  Multiple Choice Question (MCQ) of Measurements page-13  Multiple Choice Question (MCQ) of Measurements page-12  Multiple Choice Question (MCQ) of Measurements page-11  Multiple Choice Question (MCQ) of Measurements page-10  Multiple Choice Question (MCQ) of Measurements page-9  Multiple Choice Question (MCQ) of Measurements page-8  Multiple Choice Question (MCQ) of Measurements page-7  Multiple Choice Question (MCQ) of Measurements page-6  Multiple Choice Question (MCQ) of Measurements page-5  Multiple Choice Question (MCQ) of Measurements page-4  Multiple Choice Question (MCQ) of Measurements page-3  Multiple Choice Question (MCQ) of Measurements page-2  Multiple Choice Question (MCQ) of Measurements page-1  Objective questions and answers or MCQ of Electrical Machines page-22  Objective questions and answers or MCQ of Electrical Machines page-21  Objective questions and answers or MCQ of Electrical Machines page-20  Objective questions and answers or MCQ of Electrical Machines page-19  Objective questions and answers or MCQ of Electrical Machines page-18  Objective questions and answers or MCQ of Electrical Machines page-17  Objective questions and answers or MCQ of Electrical Machines page-16  Objective questions and answers or MCQ of Electrical Machines page-15  Objective questions and answers or MCQ of Electrical Machines page-14  Objective questions and answers or MCQ of Electrical Machines page-13  Objective questions and answers or MCQ of Electrical Machines page-12  Objective questions and answers or MCQ of Electrical Machines page-11  Objective questions and answers or MCQ of Electrical Machines page-10  Objective questions and answers or MCQ of Electrical Machines 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Machines page-10  Multiple Choice Question (MCQ) of D.C. Machines page-9  Multiple Choice Question (MCQ) of D.C. Machines page-8  Multiple Choice Question (MCQ) of D.C. Machines page-7  Multiple Choice Question (MCQ) of D.C. Machines page-6  Multiple Choice Question (MCQ) of D.C. Machines page-5  Multiple Choice Question (MCQ) of D.C. Machines page-4  Multiple Choice Question (MCQ) of D.C. Machines page-3  Multiple Choice Question (MCQ) of D.C. Machines page-2  Multiple Choice Question (MCQ) of D.C. Machines page-1  MCQ of D.C generators page-11  MCQ of D.C generators page-10  MCQ of D.C generators page-9  MCQ of D.C generators page-8  MCQ of D.C generators page-7  MCQ of D.C generators page-6  MCQ of D.C generators page-5

Index

SymbolsTransformerRelayPower-SystemBasic-electricalACSR-ConductorCircuit-BreakerInterview-questions-of-Basic-ElectricityInterview-questions-of-transformerInsulatorCurrent-TransformerMCQMCQ-powersystemThermal-power-stationInterview-questions-of-Power-SystemPower-ElectronicsInterview-questions-of-Underground-CableInterview-questions-of-IlluminationIlluminationMCQ-of-ElectronicsMCQ-of-Basic-ElectricalMCQ-of-Transformers MCQ-of-D.C-motor MCQ-of-D.C-generators

Objective Type Question or MCQ of Power System Protection page-2

11. Which of the following circuit breaker is generally used in applications in railways?

a) Bulk oil circuit breakers
b) Minimum oil circuit breakers
c) Air break circuit breakers
d) None of these

Ans: (c)

12. Which of thermal protection switch is provided in power line system to protect against?

a) Over voltage
b) Short circuit
c) Temperature rise
d) Overload

Ans: (d)

13. Lightining arrestor should be located

a) Away from the circuit breaker
b) Near the transformer
c) Away from the transformer
d) Near the circuit breaker

Ans: (b)

14. The dielectric strength of air at 25°C and 76 cm of mercury is

a) 2.11 kV rms/cm
b) 21.1 kV rms/m
c) 211 kV rms/cm
d) 2110 kV rms/m

Ans: (b)

15. For remote operation, circuit breaker must be equipped with

a) Inverse shunt trip
b) Shunt trip
c) Time delay trip
d) Both (a) and (c) above

Ans: (b)

16. Arc voltage produced in ac circuit breaker is always

a) In phase opposition to the arc current
b) In phase with the arc current
c) Iagging the arc current by 45°
d) Leading the arc current by 90°

Ans: (b)

17. A high speed circuit breaker can complete its operation in

a) 2 to 3 cycles
b) 6 to 12 cycles
c) 3 to 8 cycles
d) 10 to 20 cycles

Ans: (c)

18. For a 400 kV system, the capacity of lightning arrester should be

a) 1 kA
b) 5 kA
c) 10 kA
d) 50 kA

Ans: (c)

19. The power factor of the arc in a circuit breaker is

a) Zero leading
b) Zero lagging
c) Unity
d) Any value from zero to unity

Ans: (c)

20. Air blast circuit breakers are preferred for

a) Short duty
b) Repeated duty
c) Intermittent duty
d) None of these

Ans: (b)

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