A. as an insulator
B. as a device for power factor improvement
C. for dielectric heating
D. for induction heating
A. transmits all incident radiations
B. absorbs all incident radiations
C. reflects all incident radiations
D. absorbs, reflects and transmits all incident radiations
A. nickel copper
B. nichrome
C. silicon carbide
D. silver
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
A. Coreless transformers
B. Current transformers
C. Motor-generator set
D. Multi-phase transformer
A. Variation of resistance
B. Variation of voltage
C. Periodical switching on and off of the supply
D. All of the above methods
A. By disconnecting some of the heating elements
B. By varying the operating voltage
C. By varying the current through heating elements
D. By any of the above method