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Circuits > TRANSFORMERS > Flashcards

TRANSFORMERS Flashcards

1
Q

is a device used in the power transmission of electric energy.

A

Transformer

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2
Q

The transmission current is ___. It is commonly used to increase or decrease the _______________ without a change in the ____________ of AC between circuits.

Transformer

A

AC, supply voltage, frequency

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3
Q

The transformer works on the basic principles of ___________________________ and mutual induction.

Transformer

A

electromagnetic induction

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4
Q

Transformer Types: Transformers are used in various fields like power generation grid, distribution sector, transmission and electric energy consumption. (4) Various types of transformers:

Transformer

A

1) Working voltage range
2) The medium used in the core
3) Winding arrangement
4) Installation location

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5
Q

(2) Transformer as per phase:

Transformer

A

1) Single Phase
2) Three Phase

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6
Q

(2) Transformer as per core:

Transformer

A

1) Core type
2) Shell type

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7
Q

(3) Transformer as per cooling system:

Transformer

A

1) Self-cooled
2) Air-cooled
3) Oil-cooled

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8
Q

Commonly used transformer types, depending on the voltage, are classified as follows (2):

Based on VOLTAGE LEVELS.

A

1) Step-up Transformer
2) Step-down Transformer

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9
Q

used between the power generator and the power grid. The secondary output voltage is higher than the input voltage.

Based on VOLTAGE LEVELS.

A

Step-up Transformer

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10
Q

used to convert high-voltage primary supply to low-voltage secondary output.

Based on VOLTAGE LEVELS.

A

Step-down Transformer

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11
Q

In a transformer, we will find different types of cores that are used (2).

A

1) Air Core Transformer
2) Iron Core Transformer

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12
Q

the flux linkage between primary and secondary winding is through the air. The coil or windings wound on the non-magnetic strip.

Based on the MEDIUM OF CORE used.

A

Air Core Transformer

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13
Q

winding are wound in multiple iron plates stacked together, which provides a perfect linkage path to generate flux.

Based on the MEDIUM OF CORE used.

A

Iron Core Transformer

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14
Q

Based on the WINDING ARRANGEMENT. (1)

Based on the WINDING ARRANGEMENT.

A

Autotransformer

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15
Q

it will have only one winding wound over a laminated core. The primary and secondary share the same coil. Auto means “self” in the Greek language.

Based on the WINDING ARRANGEMENT.

A

Autotransformer

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16
Q

Based on INSTALL LOCATION. (4)

Based on INSTALL LOCATION.

A

1) Power Transformer
2) Distribution Transformer
3) Measurement Transformers
4) Protection Transformers

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17
Q

used at power generation stations, as they are suitable for high voltage application.

Based on INSTALL LOCATION.

A

Power Transformer

18
Q

mostly used as distribution lanes for domestic purposes. They are designed for carrying low voltages. It is very easy to install and characterised by low magnetic losses.

Based on INSTALL LOCATION.

A

Distribution Transformer

19
Q

mainly used for measuring voltage, current and power

Based on INSTALL LOCATION.

A

Measurement Transformers

20
Q

used for component protection purposes. In circuits, some components must be protected from voltage fluctuation, etc. Protection transformers ensure component protection.

Based on INSTALL LOCATION.

A

Protection Transformers

21
Q

The transformers works on the principle of ____________ of electromagnetic induction and mutual induction.

Transformers

A

Faraday’s Law

22
Q

Two coils in the Transformer?

Transformers

A

Primary coil and secondary coil

23
Q

The core laminations are joined in the form of _______.

Transformers

A

strips

24
Q

The two coils have high __________________.

Transformers

A

mutual inductance

25
Q

When an alternating current passes through the primary coil, it creates a varying (1)____________. As per Faraday’s law of electromagnetic induction, this change in magnetic flux induces an (2) ________________________ in the secondary coil, which is linked to the core having a primary coil. This is (3) _________________.

Transformers

A

(1) magnetic flux
(2) EMF (electromotive force)
(3) mutual induction

26
Q

Overall, a transformer carries out the following operations:

Transformers

A
  1. Transfer of electrical energy from one circuit to another
  2. Transfer of electrical power through electromagnetic induction
  3. Electric power transfer without any change in frequency
  4. Two circuits are linked with mutual induction.
27
Q

(3) Parts of a Single-phase Transformer

Parts of a Single-phase Transformer

A

1) Laminated core
2) Primary winding
3) Secondary winding

28
Q

The _______ acts as a support to the winding in the transformer. It also provides a _______________ path to the flow of magnetic flux

A

Core, low reluctance

29
Q

The winding is wound on the core. It is made up of a laminated ______________ in order to ____________ in a transformer.

Core

A

soft iron core, reduce losses

30
Q

The factors, such as operating _________, _________, ________, etc. decide core composition.

Core

A

voltage, current, power

31
Q

The ‘core diameter’ is directly proportional to ________ losses and inversely proportional to ______ losses.

Core

A

copper, iron

32
Q

are the set of copper wires wound over the transformer core.

Parts of a Single-phase Transformer

A

Windings

33
Q

Copper wires are used due to the following:

Windings

A

1) The high conductivity of copper
2) The high ductility of copper

34
Q

Two types of windings:

Windings

A

Primary and Secondary

35
Q

The set of turns of windings to which the supply current is fed.

A

Primary winding

36
Q

The set of turns of winding from which output is token.

A

Secondary winding

37
Q

The primary and secondary windings are insulated from each other using _______________________.

A

insulation coating agents

38
Q

is necessary for transformers to separate windings from each other and to avoid short circuits.

A

Insulation Agents

39
Q

This facilitates mutual induction, Insulation agents have an influence on the durability and stability of a transformer.

A

Insulation Agents

40
Q

(4) The following are used as insulation mediums in a transformer:

A

1) insulating oil
2) Insulating tape
3) Insulating paper
4) Wood-based lamination

41
Q

The ideal transformer has no losses. There is no magnetic leakage flux, ohmic resistance in its windings and no iron loss in the core.

A

Ideal Transformer

Circuits (4 decks)

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