The most efficient torque – producing actuating structure for induction – type relay is:
What will be the ratings of the CB?
Keeping in view the cost and overall effectiveness, the following circuit breaker is suited for capacitor bank switching?
In a circuit-breaker, the arc is produced due to
1) Thermal emission
2) High temperature of air
3) Field emission which of the above statements are correct?
Which of the following has inverse characteristics?
_______ is defined as maximum current can flow through the breaker from time of occurring short circuit to the time of clearing the short circuit without any permanent damage in the circuit breaker.
For percentage differential protection or normal differential protection, the ______ in the primary and secondary winding should be same.
Which of the following is the most common protection device that can make or break the circuit either manually or through remote control under normal operating conditions.
In an electric heater, the metal case is connected to ________
Which of the following combinations can be used for the protection of rotating machines against Lightning surges?