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The reflection co-efficient at the open circuited end of a transmission line

infinity
unity
None of these
zero

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An efficient and a well designed protective relaying should have

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

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Distance relays are generally

split-phase relays
impedance relays
reactance relays
none of these

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Arc in a circuit breaker is interrupted at

maximum current
maximum voltage
zero current
minimum voltage

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A.C. network analyzer is used to solve problems of

Load flow and short-circuit
Load flow
Load flow and stability
Load flow, short-circuit and stability

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Interruption of large currents by relay requires

wide separation of the opened contacts
arc suppressing blow out coils
high speed opening of contacts
all of these

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