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Directional relay are based on flow of

current
All of these
voltage wave
power

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The advantage of HRC fuse is that it

is quite cheap
All of these
has high speed of operation
does not deteriorate with age

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The rated secondary current of current transformer for relays is generally

5 A
30 A
10 A
20 A

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Interruption of large currents by relay requires

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

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Distance relays are generally

reactance relays
split-phase relays
none of these
impedance relays

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In Railway applications ______ circuit breaker is used.

bulk oil
SFe
air break
minimum oil

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