- (A) induction
- (B) solid state
- (C) thermal
- (D) electromagnetic
- (E) all above
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- (A) short-circuit
- (B) temperature
- (C) overload
- (D) over voltage
- (A) is yellow in colour
- (B) is lighter than air
- (C) is nontoxic
- (D) has pungent small
- (E) none of the above
- (A) Water
- (B) Oil
- (C) Air
- (D) SF6
- (A) Oil circuit breakers
- (B) Air blast circuit breakers
- (C) Minimum oil circuit breakers
- (D) All of the above
- (A) copper tungsten alloy
- (B) porcelain
- (C) electrolytic copper
- (D) aluminium alloy
- (A) a capackive reactance
- (B) an inductive reactance
- (C) a resistance increasing with voltage rise across the arc
- (D) a resistance decreasing with voltage rise across the arc
- (A) fuses
- (B) relays
- (C) fast switches
- (D) circuit breakers
- (A) delayed
- (B) instantaneous
- (C) both of the above
- (D) none of the above
- (A) maintain the arc
- (B) extinguish the arc
- (C) transmit large power
- (D) emit the ionizing electrons
