Switch Gear A circuit breaker is rated as 1500 A, 1000 MVA, 33 kv, 3-second , 3- phase oil circuit breaker. The rated normal current is None of these 750 A 1500 A 1500/√3 A None of these 750 A 1500 A 1500/√3 A ANSWER DOWNLOAD EXAMIANS APP
Switch Gear Arc in a circuit breaker is interrupted at maximum voltage maximum current zero current minimum voltage maximum voltage maximum current zero current minimum voltage ANSWER DOWNLOAD EXAMIANS APP
Switch Gear An efficient and a well designed protective relaying should have good selectivity and reliability All of these high speed and selectivity economy and simplicity good selectivity and reliability All of these high speed and selectivity economy and simplicity ANSWER DOWNLOAD EXAMIANS APP
Switch Gear The arc voltage produced in AC circuit breaker is always None of these In phase with the arc current lagging the arc current by 90° leading the arc current by 90° None of these In phase with the arc current lagging the arc current by 90° leading the arc current by 90° ANSWER DOWNLOAD EXAMIANS APP
Switch Gear Back up protection is generally used for protection against None of these open-circuit faults only short-circuit faults only both open and short-circuit faults None of these open-circuit faults only short-circuit faults only both open and short-circuit faults ANSWER DOWNLOAD EXAMIANS APP
Switch Gear The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to extinguish the arc lubricate the contacts insulate the contacts from switch body All of these None of these extinguish the arc lubricate the contacts insulate the contacts from switch body All of these None of these ANSWER DOWNLOAD EXAMIANS APP
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