Probability of fault occurrence on transmission lines is ________ as compared to transformers and alternators: Less More Equally likely Any of above Correct answer: 2. More
Which of the following equipment is used for protection against lightning surges: Circuit breaker Fuse Lightning arrester All of these Correct answer: 3. Lightning arrester
Earthing screen provides protection to ___________ against _________ lightning strikes: Power lines, direct Powerlines, indirect Power stations, direct Power stations, indirect Correct answer: 3. Power stations, direct Explanation: Earth screen refers to the GI net that is installed over the power stations and substations. Its purpose is to provide protection to power stations against direct … Read more
Distance relays decide on basis of which factor: Current Voltage Both of these None of these Correct answer: 3. Both of these Explanation: A distance relay looks at both current and voltage and then compares these two quantities on the basis of Ohm’s law.
Ground wire is installed __________ the lines conductors: Above Below In between None of these Correct answer: 1. Above
Differential protection scheme for longer lines is __________: Very cheap Cheap Expensive Too Expensive Correct answer: 4. Too expensive
Long transmission lines are protected by using which type of overcurrent protection system: Differential Time-graded protection system Pilot wires Distance protection Correct answer: 4. Distance protection
The condition responsible for the occurrence of resonance in electric power systems is: Inductive reactance > Capacitive reactance Inductive reactance < Capacitive reactance Inductive reactance = Capacitive reactance Inductive reactance = 0.1 * Capacitive reactance Correct answer: 3. Inductive reactance = Capacitive reactance
Resonance is less likely to happen at supply frequency because: Capacitance is very small Capacitance is medium Capacitance is very high None of these Correct answer: 1. Capacitance is very small
Differential relays are employed for protection of: Alternators Transformers Both of these None of these Correct answer: 3. Both of these