Test: Transformer Construction

# Test: Transformer Construction

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## 10 Questions MCQ Test Electrical Machines | Test: Transformer Construction

Test: Transformer Construction for Electrical Engineering (EE) 2023 is part of Electrical Machines preparation. The Test: Transformer Construction questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Transformer Construction MCQs are made for Electrical Engineering (EE) 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Transformer Construction below.
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Test: Transformer Construction - Question 1

### The primary and secondary of a transformer are ________ coupled but _______ connected.

Detailed Solution for Test: Transformer Construction - Question 1
• Transformer is an electrostatic device, which consists of two are more electric circuits (or) windings, these windings are separated electrically but interlinked magnetically by a common magnetic core.
• Transformer is used to transfer electrical energy from one alternating-current circuit to another through the common magnetic core at the same frequency.
Test: Transformer Construction - Question 2

### We can employ transformers for a power range of:

Detailed Solution for Test: Transformer Construction - Question 2

A transformer can be put in use upto a varying range of the power and it is usually available in readily in market.

The power rating of a transformer is obtained by simply multiplying the current by the voltage to obtain a rating in Volt-amperes, ( VA ).

Small single-phase transformers may be rated in volt-amperes only, but much larger power transformers are rated in units of Kilo volt-amperes, and units of Mega volt-amperes ( MVA )

Test: Transformer Construction - Question 3

### A transformer has comparitively much higher efficiency than a similar induction machine due to

Detailed Solution for Test: Transformer Construction - Question 3
• A transformer efficiency is always higher than the induction motor efficiency because there is no moving parts in a transformer, whereas mechanical losses occurs in an induction motor as it is not static machine like a transformer.
• Also, transformer has small air gap and strong coupling in comparison to induction motor.
Test: Transformer Construction - Question 4

It was needed that to isolate dc noise coming from the transmitted signal, to attain the same which machine can be used without suffering significant loss

Detailed Solution for Test: Transformer Construction - Question 4

We should use transformer to achive the isolation of dc.

Test: Transformer Construction - Question 5

The most widely used material in the core of the transformer is

Detailed Solution for Test: Transformer Construction - Question 5

CRGO (Cold rolled gain oriented) has magnetization in the rolling direction and low core losses and very high permeability than present materials.

Test: Transformer Construction - Question 6

The leakage flux is the flux inside the transformer which

Detailed Solution for Test: Transformer Construction - Question 6
• When the a.c power supply is applied to the primary winding of a transformer, the primary winding produces magnetic flux ϕ which flows through the iron core of the transformer, and magnetic flux cuts the secondary winding of the transformer.
• But, all the flux of primary winding does not cut the secondary winding. Some parts of the flux i.e. ϕ flow in the magnetic circuit by passing through the air rather than around the core (because air is not a good magnetic insulator).

Leakage flux is meant to be loss as it does not link two windings.

Test: Transformer Construction - Question 7

It is advised that staggering of the butt joints

Detailed Solution for Test: Transformer Construction - Question 7

Staggering is done for the steel butt joints of the transformer to gain more mechanical strength as the continuous air gap reduces the same.

Test: Transformer Construction - Question 8

Consider two transformers A and B having exact ratings, but have flux densities of 1.5T and 2T respectively. The weight of transformer A per KVA will be

Detailed Solution for Test: Transformer Construction - Question 8

Flux density = flux/Area.
Hence A has more area than B and so weight of A will be more than that of B.

Test: Transformer Construction - Question 9

A coupling magnetic field inside a rotating machine or static machine like transformers must involve with

Detailed Solution for Test: Transformer Construction - Question 9

The coupling field should interact with both the electrical as well as mechanical parts in order to achieve electromechanical energy conversion.

Test: Transformer Construction - Question 10

A coupling magnetic field inside a rotating machine or static machine like transformers must involve with:

I. electrical system to extract energy from electrical system.

II. mechanical system to extract energy from electrical system.

Detailed Solution for Test: Transformer Construction - Question 10

The energy conversion which involves both electrical as well as mechanical systems must have mutual field.

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