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The single phasing relays are used for the protection of
two phase motors only
single phase motors only
three phase motors
two single phase motors running in parallel
two phase motors only
single phase motors only
three phase motors
two single phase motors running in parallel
Answer
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Which of the following circuit breakers is prefered for EHT applications ?
air break circuit breaker
bulk oil circuit breaker
low oil circuit breaker
Sf6 CB
air break circuit breaker
bulk oil circuit breaker
low oil circuit breaker
Sf6 CB
Answer
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To reduce short circuit fault currents......... are used.
reactors
resistors
capacitors
None of these
reactors
resistors
capacitors
None of these
Answer
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Arc in a circuit breaker is interrupted at
minimum voltage
maximum voltage
maximum current
zero current
minimum voltage
maximum voltage
maximum current
zero current
Answer
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The short circuit in any winding of the transformer is the result of
mechanical vibration
impulse voltage
loose connection
insulation failure
mechanical vibration
impulse voltage
loose connection
insulation failure
Answer
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Which of the following is used in liquid fuses ?
sulphur hexafluoride
distilled water
transformer oil
carbon tetrachloride
sulphur hexafluoride
distilled water
transformer oil
carbon tetrachloride
Answer
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