1000+ Electrical Materials MCQ Questions and Answers Pdf - 2

Question: 6

Lattice thermal conductivity is more than electronic thermal conductivity in

(A) semiconductors

(B) dielectric

(C) metals

(D) all of these

Question: 7

At Neel temperature

(A) permeability is maximum

(B) permeability is minimum

(C) susceptibility is maximum

(D) susceptibility is minimum

Question: 8

In electrical machines the material preferred for pole shoes of electromagnets is

(A) aluminium

(B) lead

(C) copper

(D) pure iron

Question: 9

The resistivity component arising due to impurities and defects is commonly known as

(A) joule’s component of resistivity

(B) thermal component of resistivity

(C) residual component of resistivity

(D) none of the above

Question: 10

Which of the following dielectric materials possess maximum dielectric strength?

(A) carbon dioxide

(B) mica

(C) glass

(D) bakelite