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For interrupting of high voltage and low current, the circuit breaker prefered is

air-blast circuit breaker
oil circuit breaker
all are correct
vaccum circuit breaker

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Arc in a circuit breaker behaves as

a resistance increasing with voltage rise across the arc
a capacitive reactance
an inductive reactance
a resistance decreasing with voltage rise across the arc

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The material used for fuse must have

high melting point and low specific resistance
low melting point and any specific resistance
low melting point and high specific resistance
Low melting point and low specific resistance

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