ONLINE MCQ EE-Electrical Heating 5

Q31. In an electric room heat convector the method of heating used is
 A.  arc heating
 [Wrong Answer]
 B.  resistance heating
 [Correct Answer]
 C.  induction heating
 [Wrong Answer]
 D.  dielectric heating
 [Wrong Answer]
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Q32. Property of low temperature co-efficient of heating element is desired due to which of the following reasons ?
 A.  To avoid initial rush of current
 [Wrong Answer]
 B.  To avoid change in kW rating with temperature
 [Wrong Answer]
 C.  Both (a) and (b)
 [Correct Answer]
 D.  Either (a) or (b)
 [Wrong Answer]
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Q33. In heating the ferromagnetic material by induction heating, heat is produced due to
 A.  induced current flow through the charge
 [Wrong Answer]
 B.  hysteresis loss taking place below curie temperature
 [Wrong Answer]
 C.  due to hysteresis loss as well as eddy current loss taking place in the charge
 [Correct Answer]
 D.  none of the above factors
 [Wrong Answer]
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Q34. For the transmission of heat from one body to another
 A.  temperature of the two bodies must be different
 [Correct Answer]
 B.  both bodies must be solids
 [Wrong Answer]
 C.  both bodies must be in contact
 [Wrong Answer]
 D.  at least one of the bodies must have some source of heating
 [Wrong Answer]
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Q35. The temperature inside a furnace is usually measured by which of the following?
 A.  Optical pyrometer
 [Correct Answer]
 B.  Mercury thermometer
 [Wrong Answer]
 C.  Alcohol thermometer
 [Wrong Answer]
 D.  Any of the above
 [Wrong Answer]
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Q36. In a domestic cake baking oven the temperature is controlled by
 A.  voltage variation
 [Wrong Answer]
 B.  thermostat
 [Wrong Answer]
 C.  auto-transformer
 [Wrong Answer]
 D.  series-parallel operation
 [Correct Answer]
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Q37. Which of the following methods is used to control temperature in resistance furnaces ?
 A.  Variation of resistance
 [Wrong Answer]
 B.  Variation of voltage
 [Wrong Answer]
 C.  Periodical switching on and off of the supply
 [Wrong Answer]
 D.  All of the above methods
 [Correct Answer]
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Q38. Radiant heating is used for which of the following ?
 A.  Annealing of metals
 [Wrong Answer]
 B.  Melting of ferrous metals
 [Wrong Answer]
 C.  Heating of liquids in electric kettle
 [Wrong Answer]
 D.  Drying of paints and varnishes
 [Correct Answer]
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Q39. ____ has the highest value of thermal conductivity.
 A.  Copper
 [Correct Answer]
 B.  Aluminium
 [Wrong Answer]
 C.  Brass
 [Wrong Answer]
 D.  Steel
 [Wrong Answer]
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Q40. Heat transfer by condition will not occur when
 A.  bodies are kept in vacuum
 [Wrong Answer]
 B.  bodies are immersed in water
 [Wrong Answer]
 C.  bodies are exposed to thermal radiations
 [Wrong Answer]
 D.  temperatures of the two bodies are identical
 [Correct Answer]
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ONLINE MCQ EE-Electrical Heating 6
ONLINE MCQ EE-Electrical Heating 4

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