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GATE 2019: Power System Test 6
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Question 1
In which of the following given faults, all the sequence currents are equal?
Question 2
A transmission line has self and mutual impedances are 0.8 and 0 pu respectively. Find the positive, negative and zero sequence impedances respectively?
Question 3
A 25 MVA, 11 kV generator has 
its negative and zero sequence reactances are respectively 0.3 and 0.1 pu. The neutral of generator is solidly grounded. If the fault occurred in line to line on b and c phases, then line to line voltage Vab is.
its negative and zero sequence reactances are respectively 0.3 and 0.1 pu. The neutral of generator is solidly grounded. If the fault occurred in line to line on b and c phases, then line to line voltage Vab is.Question 4
In the system shown below consider the grid as infinite bus. Choose 6 MVA as base.
Transformer: 3-phase, 33/11 KV, 6 MVA, 0.01 + j 0.08 pu impedance.
Load: 3-phase, 11 KV, 5,800 KVA, 0.8 lag, j 0.2 pu impedance.
Impedance of each feeder: 9 + j 18 Ω
The required MVA rating of the circuit breaker CB is _________ MVA.
Transformer: 3-phase, 33/11 KV, 6 MVA, 0.01 + j 0.08 pu impedance.
Load: 3-phase, 11 KV, 5,800 KVA, 0.8 lag, j 0.2 pu impedance.
Impedance of each feeder: 9 + j 18 Ω
The required MVA rating of the circuit breaker CB is _________ MVA.
Question 5
Four alternators are connected in parallel, each alternator of 11 kV, 10 MVA,0.5 pu reactance. What is the magnitude of current(in pu) carried by CB if fault occurs at location ‘p ___________. 
Question 6
A 132 kV sub-station is having short circuit capacity of 5000 MVA in case of double line fault at the bus. The negative sequence driving point reactance is
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Sep 9ESE & GATE EE
