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RRB/SSC JE Electrical 2019 || Three Phase Transformer Quiz
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Question 1
A 
3-phase, 
transformer is ∆-connected on the h.v. side and Y-connected on the 1.v. side. The resistance of the h.v. winding is 
per phase and that of 1.v. winding 
per phase. The total full-load losses of the transformer operating at full-load efficiency of 95.8% and p.f. 0.8 (lag) are
3-phase, transformer is ∆-connected on the h.v. side and Y-connected on the 1.v. side. The resistance of the h.v. winding is per phase and that of 1.v. winding per phase. The total full-load losses of the transformer operating at full-load efficiency of 95.8% and p.f. 0.8 (lag) are Question 2
Consider the following statements regarding parallel connection of 3-phase transformers:
1) The secondary’s of all transformers must have the same phase sequence.
2) The phase displacement between primary and secondary line voltages must be the same for all transformers which are to be operated in parallel.
3) The primaries of all transformers must have the same magnitude of line voltage.
Which of the above statements are correct?
1) The secondary’s of all transformers must have the same phase sequence.
2) The phase displacement between primary and secondary line voltages must be the same for all transformers which are to be operated in parallel.
3) The primaries of all transformers must have the same magnitude of line voltage.
Which of the above statements are correct?
Question 3
A 3-phase transformer has its primary connected in delta and secondary in star. Secondary to primary turns ratio per phase is 5. For a primary phase voltage of 400 V, the secondary line voltage would be
Question 4
Which h 3-phase connection can be used in a transformer to introduce a phase difference of 30o between its output and corresponding input line voltages?
Question 5
A 3-phase Υ-Δ transformer has 420 and 36 turns on the primary and secondary windings respectively. The supply voltage on the primary side is 3.3kV, then what will be the phase voltage on the secondary side of transformer
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Apr 16ESE & GATE EE
