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To protect most of the electrical equipment handling low power, the types of relays used are
None of these
Electronic and bimetallic
Thermocouple
Both of the listed here
None of these
Electronic and bimetallic
Thermocouple
Both of the listed here
Answer
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A short-circuit is identified by
voltage rise
heavy current flow
voltage drop
no current flow
voltage rise
heavy current flow
voltage drop
no current flow
Answer
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A fuse is never inserted in
negative of dc circuit
positive of dc circuit
neutral wire
phase line
negative of dc circuit
positive of dc circuit
neutral wire
phase line
Answer
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The arc voltage produced in AC circuit breaker is always
lagging the arc current by 90°
leading the arc current by 90°
None of these
In phase with the arc current
lagging the arc current by 90°
leading the arc current by 90°
None of these
In phase with the arc current
Answer
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Wave trap is used to trap waves of
higher frequencies entering generator or transformer units
power frequencies
None of these
either of the above
higher frequencies entering generator or transformer units
power frequencies
None of these
either of the above
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Air blast circuit breaker is used for
intermittent duty
over currents
repeated duty
short duty
intermittent duty
over currents
repeated duty
short duty
Answer
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