Transformers

Question 1

Worked with electromagnets and discover the property of induction

Answer 1

Jospeh Henry

Michael Faraday

Question 2

Used induction coils in their lighting system

Answer 2

Ganz Company (Budapest, Hungary)

Question 3

Develops his own design of transformer ( Brush Electric Company)

Answer 3

Charles Francis Brush

Question 4

First built a “secondary generator” / step down transformer

Answer 4

Lucien Gaulard

John Dixon Gibbs

Question 5

Suggested the use of closed-cores

Answer 5

Otto Blathy

Question 6

Use of shunt connections

Answer 6

Karoly Zipemowsky

Question 7

Performed the experimemts

Answer 7

Miksa Deri

Question 8

Found out that high voltage circuit work using transformers in parallel

Answer 8

Blathy
Zipemowsky
Deri

Question 9

Orders a siemens alternator

Answer 9

George Westinghouse

Question 10

Makes the transformer more practical to use

Answer 10

William Stanley

Question 11

Changes low voltage into higher voltage or bice versa in AC current

Answer 11

Transformer

Question 12

Coupled conductors

Answer 12

Transformer coils

Question 13

Parts of a transformer

Answer 13

Primary coil
Secondary
Iron core

Question 14

Provides parh for tge magnetic lines of flux

Answer 14

Core

Question 15

Built up of laminated layers of iron

Answer 15

Ferromagnetic core

Question 16

Receives energy from the AC source

Answer 16

Primary winding

Question 17

Receives energy from the primary winding

Answer 17

Secondary winding

Question 18

Protects tge above components from dirt

Answer 18

Enclosure

Question 19

Putting two couls together but not touching produce magnetic field

Answer 19

Inductance effect

Question 20

Property of a circuit wgere enery is stored in tge form of electromagnetic field

Answer 20

Inductance

Question 21

Inductance was discovere by

Answer 21

Joseph Henry and Michael Faraday

Question 22

A changing magbetuc field induces a changing _______

Answer 22

Electromagnetic force / voltage

Question 23

Measure of tge amount of magnetic field passing through

Answer 23

Magnetic Flux/ Magnetic flux density

Question 24

Magnetic flux symbol

Answer 24

Phi

Question 25

Types of transformer

Answer 25

``` Closed core Autotransformer Shell type Air core Open core ```

Question 26

Built with a square core of ferromagnetic material

Answer 26

Closed core

Question 27

Electrical transformer with one winding

Answer 27

Autotransformer

Question 28

Single coil acting on itself

Answer 28

Auto prefix

Question 29

Most efficient type of transformer Used two closed core

Answer 29

Shell type transformer

Question 30

Does not have a ferromagnetic core to link the prinary and secodary coils

Answer 30

Air core transformer

Question 31

Primary and secondary are wound on one cylindrical core Highly inefficient

Answer 31

Open core transformer

Question 32

Change in voltage is _________ to the ratio of number of turns

Answer 32

Directlt proportional

Question 33

Turns ratio =

Answer 33

Ns / Np

Question 34

Transformer with a turn ratio greater than 1

Answer 34

Step up transformer

Question 35

Used to produce high kVp for xray

Answer 35

Step up transformer

Question 36

Turns ratio os less than 1

Answer 36

Step down transformer

Question 37

Transformer law

Answer 37

Vs / Vp = Ns / Np

Question 38

Transformer law and current

Answer 38

Is / Ip = Np / Ns | Np/ Ns =1/ TR