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The time of closing the cycle, in modern circuit breakers is

0.10 sec
0.003 sec
0.001 sec
0.01 sec

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

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

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The rating of a circuit breaker is generally determined on the basis of

line to line fault current
symmetrical fault current
double line to ground fault current
single line to ground fault current

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Which of the following circuit breakers is prefered for EHT applications ?

Sf6 CB
low oil circuit breaker
air break circuit breaker
bulk oil circuit breaker

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A differential relay measures the vector difference between

two voltages
two currents
two or more similar electrical quantities
None of these

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A fuse is a

current controlling device
None of these
current limiting device
protective device

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