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GATE 2019: Power System Test 11 (App update required to attempt this test)

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Question 1

What is the symmetrical breaking current if A three phase, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3 secs?

Question 2

Which of the following is favourable for switching in case of frequent switchover of Loads for an industrial power distribution System with load current of around 100A?

Question 3

A circuit breaker is rated as 1000A, 1000 MVA, 33 kV, 3 sec, 3 – phase oil circuit breaker then calculate the value of making current in (kA) of circuit breaker –

Question 4

A 11 KV, 6 MVA star connected generator has a reactance of 4.2 Ω per phase. The generator neutral is grounded through a resistance of 22 Ω. The percent of the generator winding remains unprotected by the percentage differential relaying is (Assume for simplicity that the percentage differential relay operates when out of balance current exceeds 25% of the full load current).

Question 5

In the system shown below consider the grid as infinite bus. Choose 6 MVA as base.


Transformer : 3-phase, 33/11 KV, 6 MVA, impedance.
Load : 3-phase, 11 KV, 5,800 KVA, 0.8 lag, j 0.2 pu impedance.
Impedance of each feeder :
The required MVA rating of the circuit breaker CB is

Question 6

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
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Sep 7ESE & GATE EE