Dielectric strength of a material depends on

Dielectric strength of a material is

A

Its energy stroage capacity

B

A magnetic property

C

Its capacity to resist the flow of current

D

Its capacity to withstand high voltage

When a dielectric material is subjected to alternating field, the absorption of energy by the material from the field is given by the imaginary part of polarizability.

A

True

B

False

In what ratio must a mixture of 11% sugar strength be mixed with that of 25% sugar strength so as to get a new mixture of 13% sugar strength?

A

5:1

B

6:1

C

7:2

D

10:3

Dielectric strength of rubber is around

A

5 kV/mm

B

15 kV/mm

C

30 kV/mm

D

200 kV/mm

The dielectric strength of transformer oil is expected to be

A

lkV

B

33 kV

C

100 kV

D

330 kV

Dielectric strength of mica is

A

10 to 20 kV/mm

B

30 to 50 kV/mm

C

50 to 200 kV/mm

D

300 to 500 kV/mm

Dielectric strength of medium

A

increases with rise in temperature

B

increases with moisture content

C

is same for all insulating materials

D

none of the above

When a dielectric is placed in an electric field the field strength

A

decreases

B

increases

C

reduces to zero

D

remain unchanged

Which medium has the least dielectric strength ?

A

Paraffin wax

B

Quartz

C

Glass

D

Air

Dielectric strength ______ with increasing thickness

A

increases

B

decreases

C

remains unaltered

D

none of the above

Dielectric strength of a material depends on

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