Test: Parallel Operation of Single-Phase Transformers - Electrical Engineering (EE) MCQ

# Test: Parallel Operation of Single-Phase Transformers - Electrical Engineering (EE) MCQ

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## 10 Questions MCQ Test Electrical Machines - Test: Parallel Operation of Single-Phase Transformers

Test: Parallel Operation of Single-Phase Transformers for Electrical Engineering (EE) 2024 is part of Electrical Machines preparation. The Test: Parallel Operation of Single-Phase Transformers questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Parallel Operation of Single-Phase Transformers MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Parallel Operation of Single-Phase Transformers below.
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Test: Parallel Operation of Single-Phase Transformers - Question 1

### Transformer operating in parallel will share a common load in the best possible manner if

Detailed Solution for Test: Parallel Operation of Single-Phase Transformers - Question 1

For same pu leakage impedance, parallel operation of transformers become feasible.

Test: Parallel Operation of Single-Phase Transformers - Question 2

### A 2000/1000/500 three winding transformer is to be used as auto transformer with supply of 3000 V. Two loads of 1050 kVA at 3500V,and other one at 180 kVA at 1000V. The total kVA supplied will be

Detailed Solution for Test: Parallel Operation of Single-Phase Transformers - Question 2

Total kVA = 1050+180 = 1230 kVA.

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Test: Parallel Operation of Single-Phase Transformers - Question 3

### Which if the conditions is must be fulfilled for a satisfactory parallel operation of transformers?

Detailed Solution for Test: Parallel Operation of Single-Phase Transformers - Question 3

out of all, polarity must be correct for the connected transformers.

Test: Parallel Operation of Single-Phase Transformers - Question 4

A. Positive sequence components – 5th harmonic component
B. Negative sequence components – 7th harmonic component
C. Zero sequence components – 3rd harmonic component
Above are the matching made for the harmonics and the associated harmonic component, then the correct marking is

Detailed Solution for Test: Parallel Operation of Single-Phase Transformers - Question 4

3m-1 phases are displaced 120° in opposite and (3m+1) in the same direction as the fundamental. Here ‘m’ is even integer. So 5th harmonic is in negative sequence and 7th harmonic component in positive sequence.

Test: Parallel Operation of Single-Phase Transformers - Question 5

Two single phase transformers A and B are operating in parallel having same impedance. But the x/r ratio of them are not equal. Then total kVA output of the output will be

Detailed Solution for Test: Parallel Operation of Single-Phase Transformers - Question 5

As the leakage reactances are not same for both the transformers, then Ia < I2 and Ib < I/2.
So the kVA will also be less than sum of individual A and B.

Test: Parallel Operation of Single-Phase Transformers - Question 6

Two single phase transformers A and B are operating in parallel having same impedance. But the x/r ratio of them are not equal and xa > xb. Then

Detailed Solution for Test: Parallel Operation of Single-Phase Transformers - Question 6

As xa > xb, leakage impedance angle of A will be more than that of B, so lesser power factor.

Test: Parallel Operation of Single-Phase Transformers - Question 7

Two single phase transformers A and B are operating in parallel having different impedance and identical x/r ratio. Also impedance of A is more than that of B,then A

Detailed Solution for Test: Parallel Operation of Single-Phase Transformers - Question 7

When two single-phase transformers operate in parallel with different impedances and identical x/r ratios, the transformer with the higher impedance will share less of the total load compared to the transformer with the lower impedance. This is because the current (and hence power) shared by each transformer is inversely proportional to its impedance.

Given that transformer A has more impedance than transformer B, transformer A will share less kVA of the load.

Therefore, the correct option is: shares lesser kVA

Test: Parallel Operation of Single-Phase Transformers - Question 8

Two single phase transformers A and B are operating in parallel having different impedance and identical x/r ratio. Also impedance of A is more than that of B,then

Detailed Solution for Test: Parallel Operation of Single-Phase Transformers - Question 8

Leakage impedance in ‘ohms’ are inverse ratio of their respective kVA ratings.

Test: Parallel Operation of Single-Phase Transformers - Question 9

Two single phase transformers A and B are operating in parallel having different impedance and identical x/r ratio. Impedance of A is Za and impedance of B is Zb , both sharing a load of Sl. Then the load shared by transformer B is

Detailed Solution for Test: Parallel Operation of Single-Phase Transformers - Question 9

The load sharing is based on the inverse of the kVA rating.

Test: Parallel Operation of Single-Phase Transformers - Question 10

Operating transformers in parallel gives the advantage of

Detailed Solution for Test: Parallel Operation of Single-Phase Transformers - Question 10

All are advantages of having parallel connection of transformers.

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## Electrical Machines

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