The under voltage relay can be used for
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Electrical Engineering · all questionsSwitchgear Protections
Switchgear Protections
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In order that current should flow without causing excessive heating or voltage drop, the relay contacts should
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On which of the following effects of electric current a fuse operates?
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Ionization in circuit breaker is facilitated by
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Arc in a circuit breaker is interrupted at
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Fault diverters are basically
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Relays can be designed to respond to changes in
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On which of the following routine tests are conducted ?
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Relays are used for phase faults on long line.
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By which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated ?
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The relay operating speed depends upon
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The fuse blows off by
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If the fault occurs near the impedance relay, the VII ratio will be
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Oil switches are employed for
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Which of the following circuit breakers has high reliability and minimum maintenance ?
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For which of the following ratings of the transformer differential protection is recommended ?
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When a wave propagates on a transmission line, it suffers reflection several times at
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Which of the following medium is employed for extinction of arc in air circuit breaker ?
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Protective relays are devices that detect abnormal conditions in electrical circuits by measuring
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A fuse is never inserted in
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