The directional overcurrent protection comprises which of the following relay: An overcurrent relay A power directional relay Both of these in a single package None of these Correct answer: 3. Both of these in single package
Relay protection is not provided for overload in which of the following power equipment: Transformers Generators Both of these None of these Correct answer: 2. Generators
Which of following is the least expensive protection system for low voltage systems: Isolator Circuit breaker Air breaker Breaker Fuse Correct answer: 4. Fuse The fuse is is the least expensive protection system for low voltage systems.
Which of following is a feature of good control system: It is insensitive to input commands It is sensitive to parameter variations Both of these None of these Correct answer: 4. None of these A good system is perfectly sensitive to input commands it provides output based on the user input. Also it is insensitive … Read more
In HVDC system: Both generation and distribution are DC Generation is AC and distribution is DC Both generation and generation are AC Generation is DC and distribution is AC Correct answer: 3. Both generation and generation are AC
As compared to send end voltage, the receiving end voltage of short transmission line is: Lower Higher Almost same Correct answer: 3. Almost same
Which of the following is correct statement about proximity effect: It increases the resistance of conductors It reduces self reactance Is more pronounced for large conductors All of these Correct answer: 4. All of these
The three terminals of FETs are: Collector, Emitter, and Base Collector, Drain, and Gate Source, Drain, and Gate Source, Drain, and Base Correct answer: 3. Source, Drain, and Gate
A 250 kVA transformer has full load Cu and iron losses of 1800 W and 1000 W respectively. For what value of load will the transformer have maximum efficiency: 52.55 kVA 120.38 kVA 159.65 kVA 186.33 kVA Correct answer: 4. 186.33 kVA Formula: Maximum efficiency load = Full load kVA * √(Iron loss/Full load Cu … Read more
The primary impedance of a step-up transformer as compared to secondary load impedance is: Less Same Greater Correct answer: 1. Less Explanation: If N1 and N2 are number of turns of primary and secondary and Zp and Zs are impedance values of primary and secondary. Then Zp = (N1/N2)2 * Zs For step up transformer … Read more