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When transmission line is energized, the wave that propagates on it is
current wave only
voltage wave only
both current wave and voltage wave
power factor wave only
current wave only
voltage wave only
both current wave and voltage wave
power factor wave only
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A circuit breaker is a
circuit interrupting device
None of these
current limiting device
current controlling device
circuit interrupting device
None of these
current limiting device
current controlling device
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Which of the following circuit breakers is prefered for EHT applications ?
air break circuit breaker
Sf6 CB
bulk oil circuit breaker
low oil circuit breaker
air break circuit breaker
Sf6 CB
bulk oil circuit breaker
low oil circuit breaker
Answer
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A fuse is never inserted in
phase line
negative of dc circuit
positive of dc circuit
neutral wire
phase line
negative of dc circuit
positive of dc circuit
neutral wire
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Breaking capacity of a circuit breaker is usually expressed in terms of
amperes
volts
MVA
Mw
amperes
volts
MVA
Mw
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Overheating of relay contacts or contact born out is due to
foreign matter on the contact surface
all of these
slow making and breaking of load circuit contacts
too low contact pressure
foreign matter on the contact surface
all of these
slow making and breaking of load circuit contacts
too low contact pressure
Answer
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