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Test: Three-Phase Transformers


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10 Questions MCQ Test Electrical Machines | Test: Three-Phase Transformers

Test: Three-Phase Transformers for Electrical Engineering (EE) 2022 is part of Electrical Machines preparation. The Test: Three-Phase Transformers questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Three-Phase Transformers MCQs are made for Electrical Engineering (EE) 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Three-Phase Transformers below.
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Test: Three-Phase Transformers - Question 1

A V-V connected transformer can be connected in parallel to delta-delta connected transformer but not to

Detailed Solution for Test: Three-Phase Transformers - Question 1

The V-V connected transformer and D-D connected transformers have same phase displacement, so they only can be connected in parallel to each other.

Test: Three-Phase Transformers - Question 2

 Three units of single phase transformers and one single three-phase transformer rating

Detailed Solution for Test: Three-Phase Transformers - Question 2

Three single phase transformers and one single unit of three phase transformer will be same only. this is done to reduce the cost and spacing.

Test: Three-Phase Transformers - Question 3

The transformer which is more feasible to use in the distribution ends should be

Detailed Solution for Test: Three-Phase Transformers - Question 3

Star-delta will have lower voltage at delta end.

Test: Three-Phase Transformers - Question 4

The delta-delta connections are used in applications of

Detailed Solution for Test: Three-Phase Transformers - Question 4

Delta connected winding handle line voltages so it needs more turns in the winding but thin wires.

Test: Three-Phase Transformers - Question 5

Open delta transformers can be obtained from

Detailed Solution for Test: Three-Phase Transformers - Question 5

 If one of the transformers is removed from the bank of only delta-delta, then it behaves with 58% power delivery.

Test: Three-Phase Transformers - Question 6

If para magnetic core is used in the place of the ferromagnetic core of the transformer, then magnetostriction will

Detailed Solution for Test: Three-Phase Transformers - Question 6

 If the core is not ferromagnetic then the transformer will not operate at all so no humming sound.

Test: Three-Phase Transformers - Question 7

When we magnetize the ferromagnetic core of the transformer, core length_______ and it ______ when demagnetized.

Detailed Solution for Test: Three-Phase Transformers - Question 7

Due to aligned magnetic dipoles in the material, the size will reduce by a small margin and vice versa while demagnetization.

Test: Three-Phase Transformers - Question 8

A 400 V, 10 KVA transformer at 50 Hz, is operated at the frequency of 40 Hz, then the humming

Detailed Solution for Test: Three-Phase Transformers - Question 8

 If the frequency is reduced, the core flux density increases, so the noise also will increase.

Test: Three-Phase Transformers - Question 9

 A recording of the output of the emf induced for star and delta are recorded.Then shape of the emf induced in Y-connected 3-phase transformer is non sinusoidal in nature due to

Detailed Solution for Test: Three-Phase Transformers - Question 9

In a star connected transformer, closed path to generate 3rd harmonic is not there. So the emf shape will be peaky in nature.

Test: Three-Phase Transformers - Question 10

Below is the circuit diagram for delta-delta transformer have a transformation ratio ‘k’. The current flowing in the windings of phase r-y in the below diagrams is

Detailed Solution for Test: Three-Phase Transformers - Question 10

 The phase current will be reduced by 1/1.73.

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