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GATE 2025 Power Systems Quiz 39
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Question 1
The Primary and Secondary impedance of a 50 MVA, 22/11 KV Transformer is 0.019+0.0275j p.u. each. What is the Primary and Secondary impedances of the transformer respectively(in ohms)?
Question 2
Two alternators each rated for 11 KV, 100 MVA are connected in parallel with each having 0.2 p.u. impedance. These two alternators are replaced by a single alternator with rating of 300 MVA, 11kV. What will be the new p.u. impedance____________ (Upto two decimal)
Question 3
Which of the following is the standard followed by American National Standards Institute(ANSI) for manufacture of transformers?
Question 4
A power system is represented by a single line diagram which is shown below
The Ratings of the system is as follows
Generator rating = 40 MVA, 25 KV, XG = 0.2 p.u
Transformer T1 Rating = 33/220 KV.
What will be the p.u reactance of generator near to transformer 1 to a base of 100 MVA, 33KV ?
Question 5
A 3-phase, 4-wire Balanced system (ABC sequence) supplies power to a Balanced star-connected load. The magnitude of the current in each phase is 15 A. What will be the current in the neutral wire?
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Feb 5ESE & GATE EE
