The arcing contacts in a circuit breaker are made of electrolytic copper aluminium alloy porcelain copper tungsten alloy TRUE ANSWER : ? YOUR ANSWER : ?
The fault that imposes severest duty on the circuit breaker is line to ground fault two lines to ground fault line to line fault all three lines short-circuited TRUE ANSWER : ? YOUR ANSWER : ?
________ relay is preferred for phase fault on short transmission line. Impedance Reactance None of these Induction type TRUE ANSWER : ? YOUR ANSWER : ?
For interrupting of high voltage and low current, the circuit breaker prefered is all are correct air-blast circuit breaker oil circuit breaker vaccum circuit breaker TRUE ANSWER : ? YOUR ANSWER : ?
protection of fuses is generally not used beyond 20 A 50 A 200 A 100 A TRUE ANSWER : ? YOUR ANSWER : ?
The rate of rise of restriking voltage depends on the capacitance of the system only the type of circuit breaker both inductance and capacitance of the system the inductance of the system only TRUE ANSWER : ? YOUR ANSWER : ?
The short circuit in any winding of the transformer is the result of insulation failure mechanical vibration loose connection impulse voltage TRUE ANSWER : ? YOUR ANSWER : ?
For the same power, the least size is of oil circuit breaker air-blast circuit breaker vaccum circuit breaker sf6 circuit breaker TRUE ANSWER : ? YOUR ANSWER : ?
The operating time of a circuit breaker is 0.001 sec 0.2 sec 0.05 sec 0.002 sec TRUE ANSWER : ? YOUR ANSWER : ?
Directional relay are based on flow of current power voltage wave All of these TRUE ANSWER : ? YOUR ANSWER : ?