Which of the following property is not necessarily desirable in the material for transformer core?

Which of the following properties is not necessarily desirable for the material for transformer core?

A

Low hysteresis loss

B

High permeability

C

High thermal conductivity

D

Adequate mechanical strength

Material used for construction of transformer core is usually

A

wood

B

copper

C

aluminium

D

silicon steel

The permeability of a core material is an indication of the ability of the material to establish a magnetic field.

A

True

B

False

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

Which of the following is not a desirable property of a refrigerant?

A

High risibility with oil

B

Low boiling point

C

Good electrical conductor

D

Large latent heat

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

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

The core used in high frequency transformer is usually

A

copper core

B

cost iron core

C

air core

D

mild steel core

Which of the following property is not necessarily desirable in the material for transformer core?

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