GATE EE 2021 : Power System Quiz 9

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Question 1

High level factors which influence line protection will include:

• ACriticality in load transfer
• BCriticality in system stability
• CFault clearing time requirements for system stability
• DAll of above

Question 2

In an inverse definite minimum time, electromagnetic type over-current relay the minimum time feature is achieved because of

• Asaturation of the magnetic circuit
• Bproper mechanical design
• Cappropriate time delay element
• Delectromagnetic damping

Question 3

In induction type directional over current relay the driving torque is due to interaction of magnetic fields derived from

• ACurrent in the potential coil
• BBoth voltage and current in the relay windings
• CDirectional element and non-directional element
• DNon-directional element and the trip circuit

Question 4

What will be the short circuit if the percentage reactance of an element is 20 % and full load current is 50 Amp?

• A300 Amp
• B450 Amp
• C250 Amp
• D200 Amp

Question 5

The distribution system shown in the figure is to be protected by over current system of protection. For proper fault discrimination, directional over current relays will be required at locations

• A1 and 4
• B2 and 3
• C1, 4 and 5
• D2, 3 and 5

Question 6

A zero voltage condition that lasts for more than two cycles is

• ABlack outs
• BBrown outs
• CVoltage swell
• DNone of these

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