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ESE-2018 Electrical Engineering Quiz 6

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Question 1

Two single phase transformers A and B are connected in parallel, observing all requirements of a parallel operation, except that the induced voltage E_a is slightly greater than E_b; Z_ea and Z_eb being the equivalent impedances of A and B, both referred to the secondary side.

Under this operating condition with the primary bus-bars being energized, a circulating current will flow:

Question 2

Assertion (A): AC armature windings are short chorded by selecting value of coil span more than the pole pitch.
Reason (R): Short chording is done to eliminate harmonics in the induced e.m.f.

Question 3

What are the conditions to be satisfied for alternator to be synchronized with an incoming supply?
1) Equal voltage
2) Equal frequency
3) Same power rating
4) Same phase sequence
Select the correct answer using the code given below:

Question 4

Which one of the following is the type of single phase induction motor having the highest power factor at full load?

Question 5

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

Question 6

A two winding 220 V/1 10 V, 1.5 kVA transformer is reconnected as a 220/330 V autotransformer. It is re-rated as

Question 7

If the voltage applied to a transformer primary is increased keeping the V/f ratio fixed, the magnetizing current and the core loss will respectively :

Question 8

Match List-I (Test) with List-II (Quantities) and select the correct answer using the code given below the lists:
List-I
A. O.C. Test
B. S C Test
C. Sumpner’s Test
D. Load Test
List-II
1) Copper loss and iron loss
2) Total losses
3) Iron loss
4) Copper loss

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ESE & GATE EE Electrical Machines

Aug 2ESE & GATE EE