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Consider the following statements with respect to a relay: 1. A relay is energized if NC contacts are opened. 2. The pickup current is the minimum relay coil current required to keep a relay energized. Which of the above statements is/are correct?
If a transformer is provided with differentially connected relay. To prevent the mal operation of the relay, the relay relay operating coil is biased with ______
Buchholz relay is a protection relay used in oil immersed transformers. Under what conditions does Buchholz Relay will NOT operate?
Which of the following conditions must be satisfied for a transistor to be in saturation? 1. Its collector to base junction should be under forward bias 2. Its collector to base junction should be under reverse bias 3. Its emitter to base junction should be under reverse bias 4. Its emitter to base junction should be under forward bias Which of the above conditions are correct?
If CT is the transition capacitance, which of the following are true? 1) in forward bias, CT dominates 2) in reverse bias, CT dominates 3) in forward bias, diffusion capacitance dominates 4) in reverse bias, diffusion capacitance dominates
There exist three terminals in a relay called C, NO, NC, in an application, it is desired that whenever the relay is active the load must be connected be supply, otherwise the load will be disconnected from supply. Which of the following connection type in relay will provide solution to the stated problem?
A solenoid type relay is what type of relay as far as the relay timing is concerned?
If a transformer is provided with differentially connected relay. To prevent the mal operation of the relay, the relay restraining coil is biased with ______________
Which relay is a gas operated relay used for the protection of oil immersed transformer against the types of internal faults?
The given figure shows protection system scheme for one phase of generator. A high resistance fault occurs near the neutral end with the current distribution as marked. The slope of the relay is 10% and pick-up current of 0.15A. The CT ratio is 500/5. Will the relay operate under given circumstances?