For an insulating material, dielectric strength and dielectric losses should be

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Question
For an insulating material, dielectric strength and dielectric losses should be
Options
A. high and high
B. low and high
C. high and low
D. low and low

Correct Answer

high and low

Explanation

An insulating material should have high dielectric strength and low losses.

Materials and Components problems

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1. As the temperature of semiconductor is increased
Options
A. the average number of free charge carriers decreases
B. the average number of free charge carriers increases
C. the average number of free charge carriers remains the same
D. the average number of free charge carriers may increase or decrease

2. Some ceramic materials become superconducting
Options
A. below liquid helium temperature
B. between liquid helium and liquid nitrogen temperature
C. above liquid nitrogen but below room temperature
D. at room temperature

5. A piece of copper and another piece of Germanium are cooled from 30�C to 80 K. The resistance of
Options
A. copper decreases and germanium increases
B. both decreases
C. both increases
D. copper increases and germanium decreases

7. Assertion (A): Ferrites are very useful at very high frequencies.
Reason (R): Ferrites have high permeability and high resistivity.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

8. If v is velocity of electron, ?₀ is absolute permittivity, m is mass of electron, e is charge on electron and r is the radius of orbit of electron in hydrogen atom, the stability of orbit requires the following equation to be satisfied
Options
A.
B.
C.
D.

9. Assertion (A): For a dielectric, P = ?₀(?_r - 1) E.
Reason (R): Dipole moment per unit volume is called polarization of dielectric.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

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