The core used in high frequency transformer is usually

Material used for construction of transformer core is usually

A

wood

B

copper

C

aluminium

D

silicon steel

The applied voltage of a certain transformer is increased by 50%, while the frequency is reduced by 50%. The maximum core flux density will

A

become three times

B

become 1.5 times

C

become half

D

remian the same

A survey was conducted among the students of Khulna University to find out how many forms of physical exercise usually swam, 25% said they usually did jogging, 20% said they played cricket, 15% said they usually played football and 20 respondents said they did not take any form of exercise. From the above findings it can be concluded that.

A

The student of khulna University do not usually take physical exercise.

B

No respondent took more than one form of exercise.

C

The method of data collection was not valid.

D

Some of the respondents took more than one form of exercise.

The output transformer used in a power amplifier is a ___________ transformer

A

1:1 ratio

B

Step-up

C

Step-down

D

None of the above

A ferrite core has less eddy current loss than an iron core because

A

Ferrites have high resistance

B

Ferrites are magnetic

C

Ferrites have low permeability

D

Ferrites have high hysteresis

What is the purpose of providing an iron core in a transformer?

A

Provide support to windings

B

Reduce hysteresis loss

C

Decrease the reluctance of the magnetic path

D

Reduce eddy current losses

The purpose of providing an iron core in a transformer is to

A

provide support to windings

B

reduce hysteresis loss

C

decrease the reluctance of the magnetic path

D

reduce eddy current losses

The size of a transformer core will depend on

A

frequency

B

area of the core

C

flux density of the core material

D

(A) and (B) both

A transformer core is laminated to

A

reduce hysteresis loss

B

reduce eddy current losses

C

reduce copper losses

D

reduce all above losses

The purpose of providing iron core in a step-up transformer is

A

To provide coupling between primary and secondary

B

To increase the magnitude of mutual flux

C

To decrease the magnitude of magnetizing current

D

To provide all above features

The core used in high frequency transformer is usually

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