Q 1. Which one of the following is the bread toasting zone temperature?

A. 800° C
B. 260° C
C. 975° C
D. 400° C

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Answer. b

Q 2. Out of the following methods of heating the one which is independent of supply frequency is 

A. electric arc heating 
B. induction heating 
C. electric resistance
D. dielectric heating

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Answer. c

Q 3. A black body when heated to ____________ emits the maximum energy in the visible spectrum range.

A. 5000° C
B. 3250° C
C. 6250° C
D. 8000° C

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Answer. c

Q 4. For power factor correction in a welding circuit, a capacitor is usually connected _______.

A. across the mains
B. across secondary side welding transformer
C. across primary side of welding transformer
D. across acting electrodes

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Answer. c

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