Option A: To avoid initial rush of current
Option B: To avoid change in kW rating with temperature
Option C: Both (A) and (B)
Option D: Either (A) or (B)
Correct Answer: Both (A) and (B) ✔
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Option A: zero
Option B: 0.707 lagging
Option C: unity
Option D: 0.707 leading
Correct Answer: 0.707 lagging ✔
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Option A: it is filled below core level
Option B: it is filled above core level
Option C: it is fully empty
Option D: none of the above
Correct Answer: it is filled above core level ✔
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Option A: Variation of resistance
Option B: Variation of voltage
Option C: Periodical switching on and off of the supply
Option D: All of the above methods
Correct Answer: All of the above methods ✔
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Option A: to stabilize the arc
Option B: to imprpve, power factor
Option C: to reduce severity of the surge
Option D: none of the above
Correct Answer: to stabilize the arc ✔
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Option A: induction heating of steel
Option B: dielectric heating
Option C: induction heating of brass
Option D: resistance heating
Correct Answer: induction heating of steel ✔
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Option A: bad, good
Option B: bad, bad
Option C: good, bad
Option D: good, good
Correct Answer: good, bad ✔
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Option A: induced current flow through the charge
Option B: hysteresis loss taking place below curie temperature
Option C: due to hysteresis loss as well as eddy current loss takingplace in the charge
Option D: none of the above factors
Correct Answer: due to hysteresis loss as well as eddy current loss takingplace in the charge ✔
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Option A: series
Option B: parallel
Option C: series-parallel connections
Option D: star-delta connections
Correct Answer: all of the above ways ✔
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Option A: Thermostat
Option B: Thermocouple
Option C: Auto-transformer
Option D: Heating elements of variable resis-tance material
Correct Answer: Thermocouple ✔
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Option A: Unity
Option B: Low, lagging
Option C: Low, leading
Option D: Any of the above
Correct Answer: Low, lagging ✔
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Option A: The amount of heat generated can be controlled accurately
Option B: Heat at very high rate can be gene-rated
Option C: The area of the surface over which heat is produced can be accurately controlled
Option D: All of the above
Correct Answer: All of the above ✔
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Option A: Annealing of metals
Option B: Melting of ferrous metals
Option C: Heating of liquids in electric kettle
Option D: Drying of paints and varnishes
Correct Answer: Drying of paints and varnishes ✔
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Option A: copper alloy
Option B: carbon
Option C: tungsten alloy
Option D: stainless steel alloy
Correct Answer: tungsten alloy ✔
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Option A: tungsten
Option B: graphite
Option C: silver
Option D: copper
Correct Answer: graphite ✔
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Option A: Current
Option B: Voltage
Option C: Power factor
Option D: All of the above
Correct Answer: Current ✔
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Option A: voltage variation
Option B: thermostat
Option C: auto-transformer
Option D: series-parallel operation
Correct Answer: series-parallel operation ✔
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Option A: To achieve better heating
Option B: To increase the life of roof refractory
Option C: To have better stirring action
Option D: To reduce problem of oxidation
Correct Answer: All of the above ✔
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Option A: as an insulator
Option B: as a device for power factor improvement
Option C: for dielectric heating
Option D: for induction heating
Correct Answer: as an insulator ✔
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Option A: Coreless transformers
Option B: Current transformers
Option C: Motor-generator set
Option D: Multi-phase transformer
Correct Answer: Motor-generator set ✔
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Option A: Optical pyrometer
Option B: Mercury thermometer
Option C: Alcohol thermometer
Option D: Any of the above
Correct Answer: Optical pyrometer ✔
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Option A: Asbestos paper
Option B: Diatomaceous earth
Option C: 80 percent magnesia
Option D: Cork
Correct Answer: Diatomaceous earth ✔
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Option A: lower melting point
Option B: higher temperature coefficient
Option C: high specific resistance
Option D: all of the above
Correct Answer: high specific resistance ✔
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Option A: arc heating
Option B: resistance heating
Option C: induction heating
Option D: dielectric heating
Correct Answer: resistance heating ✔
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Option A: Heat treatment of castings
Option B: Heating of insulators
Option C: Melting aluminium
Option D: None of the above
Correct Answer: Heat treatment of castings ✔
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Option A: Heat loss through furnace wall will increase
Option B: Temperature inside the furnace will fall
Option C: Temperature on the outer surface of furnace walls will drop
Option D: Energy consumption will increase
Correct Answer: Temperature on the outer surface of furnace walls will drop ✔
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A non-dimensional number generally associated with natural convection heat transfer is__________?
Option A: Prandtl number
Option B: Grashoff number
Option C: Pecelet number
Option D: Nusselt number
Correct Answer: Grashoff number ✔
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Option A: Thermal ion release principle
Option B: Nucleate heating principle
Option C: Resistance heating principle
Option D: Electro-magnetic induction princi¬ple
Correct Answer: Electro-magnetic induction princi¬ple ✔
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Option A: ablation
Option B: radiation
Option C: viscous dissipation
Option D: irradiation
Correct Answer: ablation ✔
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Option A: nickel copper
Option B: nichrome
Option C: silicon carbide
Option D: silver
Correct Answer: silicon carbide ✔
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Option A: reduce the length of heating element
Option B: increase the life of the heating element
Option C: reduce the effect of oxidation
Option D: produce large amount of heat
Correct Answer: reduce the length of heating element ✔
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Option A: radiation
Option B: convection
Option C: conduction
Option D: any of the above
Correct Answer: A. radiation
B. convection
C. conduction ✔
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Option A: Indirect arc furnace
Option B: Core less furnace
Option C: Either of the above
Option D: None of the above
Correct Answer: Either of the above ✔
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Option A: Insulating materials
Option B: Conducting materials which are magnetic
Option C: Conducting materials which are non-magnetic
Option D: Conducting materials which may or may not be magnetic
Correct Answer: Conducting materials which may or may not be magnetic ✔
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Option A: By disconnecting some of the heating elements
Option B: By varying the operating voltage
Option C: By varying the current through heating elements
Option D: By any of the above method
Correct Answer: By any of the above method ✔
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Option A: phase angle
Option B: frequency
Option C: current
Option D: voltage
Correct Answer: frequency ✔
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Option A: oxidizing
Option B: deoxidising
Option C: reducing
Option D: neutral
Correct Answer: oxidizing ✔
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Option A: Water
Option B: Steam
Option C: Sold ice
Option D: Melting ice
Correct Answer: Sold ice ✔
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Option A: bodies are kept in vacuum
Option B: bodies are immersed in water
Option C: bodies are exposed to thermal radiations
Option D: temperatures of the two bodies are identical
Correct Answer: temperatures of the two bodies are identical ✔
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Option A: inside boiler furnaces
Option B: during melting of ice
Option C: through the surface of the insulted pipe carrying steam
Option D: from refrigerator coils to freezer of a refrigerator
Correct Answer: inside boiler furnaces ✔
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Option A: temperature of the two bodies must be different
Option B: both bodies must be solids
Option C: both bodies must be in contact
Option D: at least one of the bodies must have some source of heating
Correct Answer: temperature of the two bodies must be different ✔
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Option A: transmits all incident radiations
Option B: absorbs all incident radiations
Option C: reflects all incident radiations
Option D: absorbs, reflects and transmits all incident radiations
Correct Answer: absorbs all incident radiations ✔
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Option A: white body
Option B: grey body
Option C: black body
Option D: transparent body
Correct Answer: white body ✔
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Option A: Eddy current heating
Option B: Arc heating
Option C: Induction heating
Option D: Dielectric heating
Correct Answer: Dielectric heating ✔
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Option A: Copper
Option B: Aluminium
Option C: Brass
Option D: Steel
Correct Answer: ✔
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Option A: Arc heating
Option B: Dielectric heating
Option C: Induction heating
Option D: Resistance heating
Correct Answer: Resistance heating ✔
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Option A: Quicker operation
Option B: Higher efficiency
Option C: Absence of flue gases
Option D: All of the above
Correct Answer: All of the above ✔
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Option A: Resistance heating
Option B: Dielectric heating
Option C: Arc heating
Option D: Induction heating
Correct Answer: Dielectric heating ✔
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Option A: Induction heating
Option B: Dielectric heating
Option C: Electric resistance heating
Option D: All of the above
Correct Answer: Electric resistance heating ✔
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