A) a current interrupting device B) a waveform correcting device C) a device to neutralize the effect of transients D) power factor correcting device. Ans : (A)
A) Sulphur hexafluorine B) Sulphur hexafluoride C) Sulphur difluoride D) Sulphur fluoride. Ans : (B)
A) is non-inflammable B) is highly toxic C) has pungent odour D) is yellow in colour. Ans : (A)
A) to each any stray voltages B) to close the contacts when the actuating quantity reaches a certain predetermined value C) to limit arcing current during the operating of circuit breaker D) to provide additional safety in the operation of circuit breaker. Ans : (B)
A) is lighter than hydrogen B) is lighter than air C) has density 2 times as compared to that of air D) has density 5 times as compared to that of air. Ans : (D)
A) 100 mm Hg B) 1 kg/cm2 C) 3 to 5 kg/cm2 D) 30 to 50 kg/cm2 Ans : (C)
A) 220 V B) 400 V C) 1000 V D) 10,000 V. Ans : (C)
A) few cycles of supply voltage B) one second C) few second D) few minutes. Ans : (A)
A) high dielectric strength B) non-inflammability C) non-toxicity D) all of the above. Ans : (D)
A) Tank type oil circuit breaker B) Air-break circuit breaker C) Air-blast circuit breaker D) SF6 circuit breaker. Ans : (B)