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Which of the following CB's is generally used in railways applications ?
air break circuit breaker
bulk oil circuit breaker
sf 6 circuit breaker
low oil circuit breaker
air break circuit breaker
bulk oil circuit breaker
sf 6 circuit breaker
low oil circuit breaker
Answer
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Breaking capacity of a circuit breaker is usually expressed in terms of
volts
amperes
MVA
Mw
volts
amperes
MVA
Mw
Answer
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The fault that imposes severest duty on the circuit breaker is
line to line fault
two lines to ground fault
line to ground fault
all three lines short-circuited
line to line fault
two lines to ground fault
line to ground fault
all three lines short-circuited
Answer
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________ relay is preferred for phase fault on short transmission line.
Induction type
Reactance
None of these
Impedance
Induction type
Reactance
None of these
Impedance
Answer
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Directional relay are based on flow of
power
voltage wave
current
All of these
power
voltage wave
current
All of these
Answer
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A fuse should have
low cost
All of these
low melting point
high conductivity
low cost
All of these
low melting point
high conductivity
Answer
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