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GATE EE 2018 EXAM:Electrical Machines Quiz 4

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Question 1

In which one of the following sets of 3-phase transformer connections will zero sequence current be present in the transformer windings?

Question 2

What will be the total power in the balanced Delta Delta connected system?

Question 3

Transformer is a device which transforms __________ at one level to ___________ at required higher/lower/same level.

Question 4

Which three-phase connection can be used in a transformer to introduce a phase difference of 30^o between its output and corresponding input line voltages?

Question 5

When one transformer is removed from a bank of 30 kVA transformer, the capacity of the resulting 3-phase trans-former corresponding input line voltages?

Question 6

An 11 kV/415 V, 3- φ, 50 Hz distribution transformer has its HV and LV windings connected in delta and star respectively. It is delivering 100 KVA load at 0.8 pf(lag) ____ A is the current in LV windings.

Question 7

Figure shows an ideal three–winding transformer. The three windings 1, 2, 3 of the transformer are wound on the same core as shown. The turn’s ratio N₁:N₂:N₃ is 4:2:1. A resistor of 10W is connected across winding–2. A capacitor of reactance 2.5W is connected across winding–3. Winding–1 is connected across a 400 V, ac supply. If the supply voltage phasor V₁ = 400∠0 °, the supply current phasor I₁ is given by

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ESE & GATE EE Electrical Machines

Jun 24ESE & GATE EE