A. radiation

B. viscous dissipation

D. irradiation

A. Current transformers

B. Coreless transformers

C. Multi-phase transformer

B. both bodies must be solids

C. both bodies must be in contact

D. at least one of the bodies must have some source of heating

A. grey body

B. black body

D. transparent body

B. it is fully empty

C. it is filled below core level

D. none of the above

A. Brass

B. Copper

C. Steel

D. Aluminium

A. series

B. parallel

C. series-parallel connections

E. star-delta connections

A. lower melting point

C. all of the above

D. higher temperature coefficient

A. induced current flow through the charge

B. none of the above factors

C. hysteresis loss taking place below curie temperature

A. copper alloy

B. carbon

C. stainless steel alloy

B. Higher efficiency

C. Absence of flue gases

D. Quicker operation

A. Heat at very high rate can be gene-rated

C. The amount of heat generated can be controlled accurately

D. The area of the surface over which heat is produced can be accurately controlled

A. Heat loss through furnace wall will increase

B. Energy consumption will increase

D. Temperature inside the furnace will fall

A. resistance heating

B. induction heating of brass

D. dielectric heating

A. Induction heating

B. All of the above

C. Dielectric heating

A. Arc heating

C. Induction heating

D. Dielectric heating

A. Power factor

B. All of the above

C. Voltage

A. induction heating

B. dielectric heating

D. arc heating

B. nickel copper

C. silver

D. nichrome

A. Prandtl number

B. Pecelet number

D. Nusselt number

B. Any of the above

C. Mercury thermometer

D. Alcohol thermometer

A. Unity

B. Low, leading

D. Any of the above

B. as a device for power factor improvement

C. for induction heating

D. for dielectric heating

A. To avoid initial rush of current

B. To avoid change in kW rating with temperature

D. Either (A) or (B)

A. Periodical switching on and off of the supply

B. Variation of voltage

D. Variation of resistance

A. Melting aluminium

C. Heating of insulators

D. None of the above

A. conduction</strong>

B. any of the above

D. convection

A. increase the life of the heating element

B. reduce the effect of oxidation

D. produce large amount of heat

A. Melting ice

B. Water

D. Steam

B. By varying the current through heating elements

C. By disconnecting some of the heating elements

D. By varying the operating voltage

A. zero

B. 0.707 leading

C. unity

A. voltage variation

B. auto-transformer

D. thermostat

A. deoxidising

B. reducing

C. neutral

B. from refrigerator coils to freezer of a refrigerator

C. through the surface of the insulted pipe carrying steam

D. during melting of ice

A. good, good

B. bad, good

D. bad, bad

A. Induction heating

B. Arc heating

D. Eddy current heating

A. phase angle

B. current

C. voltage

B. transmits all incident radiations

C. reflects all incident radiations

D. absorbs, reflects and transmits all incident radiations

A. Annealing of metals

C. Heating of liquids in electric kettle

D. Melting of ferrous metals

A. Thermostat

B. Heating elements of variable resis-tance material

D. Auto-transformer

B. None of the above

C. Core less furnace

D. Indirect arc furnace

A. Nucleate heating principle

C. Thermal ion release principle

D. Resistance heating principle

A. Conducting materials which are magnetic

B. Conducting materials which are non-magnetic

D. Insulating materials

B. copper

C. tungsten

D. silver

A. T2

B. T1

D. T3

B. bodies are kept in vacuum

C. bodies are exposed to thermal radiations

D. bodies are immersed in water

A. to imprpve, power factor

B. none of the above

C. to reduce severity of the surge

B. Arc heating

C. Induction heating

D. Resistance heating

A. To increase the life of roof refractory

B. To have better stirring action

C. To achieve better heating

E. To reduce problem of oxidation

A. Cork

C. Asbestos paper

D. 80 percent magnesia