Important Electric Heating Multiple Choice Questions and Answers
1. In induction heating ........is abnormally high
A. Phase angle
B. Frequency
C. Current
D. Voltage
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B. Frequency
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2. For heating element high resistivity material is chosen to
A. Reduce the length of heating element
B. Increase the life of the heating element
C. Reduce the effect of oxidation
D. Producing large amount of heat
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3. Induction heating takes place in which of the following ?
A. Insulating materials
B. Conducting materials which are magnetic
C. Conducting materials which are non-magnetic
D. Conducting materials which may or may not be magnetic
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4. In resistance heating highest working temperature is obtained from heating elements made of
A. Nickel copper
B.. Nichrome
C. Silicon carbide
D. Silver
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5. In the indirect resistance heating method, maximum heat transfer takes place by
A. Radiation
B. Convection
C. Conduction
D. Any of the above
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