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Relay can be designed to respond to changes in
voltage and current
resistance, reactance and impedance
All of these
temperature
voltage and current
resistance, reactance and impedance
All of these
temperature
Answer
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A fuse element is generally made of
silver
brass
iron
steel
silver
brass
iron
steel
Answer
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If the length of the arc in a circuit breaker increases, its resistance
remains same
None of these
decreases
increases
remains same
None of these
decreases
increases
Answer
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Which of the following is used in liquid fuses ?
carbon tetrachloride
sulphur hexafluoride
distilled water
transformer oil
carbon tetrachloride
sulphur hexafluoride
distilled water
transformer oil
Answer
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The relay operating speed depends upon
armature core air gap
the rate of flux built up
the spring tension
All of these
armature core air gap
the rate of flux built up
the spring tension
All of these
Answer
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For interrupting of high voltage and low current, the circuit breaker prefered is
vaccum circuit breaker
all are correct
oil circuit breaker
air-blast circuit breaker
vaccum circuit breaker
all are correct
oil circuit breaker
air-blast circuit breaker
Answer
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