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Breaking capacity of a circuit breaker is usually expressed in terms of

Mw
MVA
amperes
volts

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The single phasing relays are used for the protection of

three phase motors
two single phase motors running in parallel
two phase motors only
single phase motors only

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If the length of the arc in a circuit breaker increases, its resistance

increases
None of these
decreases
remains same

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The power loss is an important factor for the design of

transmission line
generator
feeder
motor

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An efficient and a well designed protective relaying should have

good selectivity and reliability
high speed and selectivity
economy and simplicity
All of these

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For the same power, the least size is of

oil circuit breaker
air-blast circuit breaker
vaccum circuit breaker
sf6 circuit breaker

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