43. Breakdown of insulation of a cable can be avoided economically by the use of
44. The dielectric strength of air at 25?C and 76 cm of mercury is
45. Bulk oil circuit breaker is suitable for voltages upto
46. For remote operation, circuit breaker must be equipped with
47. The following medium is employed for extinction of arc in air break circuit breakers?
48. Which of the following circuit breakers takes minimum time for installation?
49. In oil and air blast circuit breakers, the current zero interruption is attained by
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