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Arc in a circuit breaker is interrupted at

zero current
minimum voltage
maximum current
maximum voltage

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Admittance relay is

directional relay
impedance relay
None of these
non-directional relay

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The device that detects the fault in a power system is

relay
isolator
None of these
circuit breaker

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To protect most of the electrical equipment handling low power, the types of relays used are

Thermocouple
Both of the listed here
Electronic and bimetallic
None of these

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When the circuit breaker operates under fault conditions, the greatest noise is produced in

vaccum circuit breaker
air-blast circuit breaker
oil circuit breaker
sf6 circuit breaker

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HRC fuses provide best protection against

short circuits
open circuits
reverse current
overload

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