1000+ Electric Heating & Welding MCQ Questions and Answers - 1

Question: 1

A perfect black body is one that

(A) absorbs, reflects and transmits all incident radiations

(B) reflects all incident radiations

(C) transmits all incident radiations

(D) absorbs all incident radiations

Question: 2

Which of the following will happen if the thickness of refractory wall of furnace is increased?

(A) energy consumption will increase

(B) temperature on the outer surface of furnace walls will drop

(C) temperature inside the furnace will fall

(D) heat loss through furnace wall will increase

Question: 3

Induction heating takes place in which of the following?

(A) conducting materials which may or may not be magnetic

(B) conducting materials which are non magnetic

(C) conducting materials which are magnetic

(D) insulating materials

Question: 4

Hysteresis loss and eddy current loss are used in

(A) resistance heating

(B) induction heating of brass

(C) dielectric heating

(D) induction heating of steel

Question: 5

The electrode of a direct arc furnace is made of

(A) copper

(B) silver

(C) tungsten

(D) graphite