7000+ GATE EE Previous Year Question Papers with Solutions pdf - 1

Question: 1

At what condition of surrounding air, does electrochemical breakdown occur?

(A) Low temperature and low humidity

(B) Low temperature and high humidity

(C) High temperature and low humidity

(D) High temperature and high humidity

Question: 2

Which one of the following materials cannot be used for permanent magnets?

(A) Alnico

(B) Barium ferrite

(C) Carbon steel

(D) Iron cobalt alloy

Question: 3

The presence of one of the following materials, in iron or steel for use as a magnetic material, tends to reduce the hysteresis loss

(A) Silicon

(B) Phosphorous

(C) Sulphur

(D) Carbon

Question: 4

Which one of the following compounds is widely used for making ferrites?

(A) Fe₂O₃

(B) MgO

(C) CuO

(D) FeO

Question: 5

What is the chemical bonding in silicon semiconductor?

(A) Covalent

(B) Vander Waals

(C) Ionic

(D) Metallic