Solid earthing a power transformer means: Neutral is directly connected to earth via conductor Neutral is connected to earth via a resistor Neutral is connected to earth via a suppression coil known as Peterson coil The neutral is connected to chassis of metal which is connected to earth via a resistor Correct answer: 1. Neutral … Read more
Only the earthing is not enough to ensure that humans are protected when contacting a live conductor: Above statement is correct Above statement is false Correct answer: 1. Above statement is correct
Buchholz relay is best classified as: Digital relay Numerical relay Gas-actuated relay Static Analog relay Correct answer: 3. Gas-actuated relay Buchholz relay is a gas-actuated relay which is used in oil-immersed transformers for providing protection against different types of faults. More PSP MCQ: Solid earthing a power transformer means In case of serious faults, Buchholz … Read more
In case of serious faults, Buchholz Relay: Sounds alarm Trips circuit breaker Both of these None of these Correct answer: 1. Sounds alarm
The most ideal operating time of relay in power system: 15 seconds More than 15 seconds 1 second Less than 1 second Correct answer: 4. Less than 1 second
Buchholz Relay in the transformer is recommended for: Incipient faults only Serious faults only Both of these None of these Correct answer: 3. Both of these
Stator winding faults when not cleared in alternators: Cause high damage Will badly damage the machine Both of these None of these Correct answer: 3. Stator winding faults are most dangerous and they need automatic protection. When such faults are not cleared they will result in huge damges to machine
The current transformers that are used to protect power transformer with star-delta connection against the earth and phase faults should be connected in which configuration: Star – Delta Configuration Delta – Star Configuration Star – Star Configuration Delta – Delta Configuration Correct answer: 2. Delta – Star Configuration
The number of pilot wires required to protect transmission lines using Translay protection system is: One Two Three Four Correct answer: 2. Two
The correct statement about differential protection of transmission lines: It’s cheap but not well suited in detecting faults It’s expensive as well as can’t detect the majority of faults It’s cheap and well suited for detecting faults It’s expensive but ideal for fault detection Correct answer: 4. It’s expensive but ideal for fault detection