# ONLINE MCQ EE-Electrical Heating 5

Q31. In an electric room heat convector the method of heating used is
A.  arc heating
B.  resistance heating
C.  induction heating
D.  dielectric heating
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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
B.  To avoid change in kW rating with temperature
C.  Both (a) and (b)
D.  Either (a) or (b)
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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
B.  hysteresis loss taking place below curie temperature
C.  due to hysteresis loss as well as eddy current loss taking place in the charge
D.  none of the above factors
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Q34. For the transmission of heat from one body to another
A.  temperature of the two bodies must be different
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
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Q35. The temperature inside a furnace is usually measured by which of the following?
A.  Optical pyrometer
B.  Mercury thermometer
C.  Alcohol thermometer
D.  Any of the above
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Q36. In a domestic cake baking oven the temperature is controlled by
A.  voltage variation
B.  thermostat
C.  auto-transformer
D.  series-parallel operation
 \$(document).ready(function(){ \$(‘#loaddata1229’).click(function(){ qid1229=\$(‘#qid1229’).val(); section1229=\$(‘#section1229’).val(); type1229=\$(‘#type1229’).val(); subtype1229=\$(‘#subtype1229’).val(); \$.post(‘../../fav’,{ qid:qid1229, section: section1229, type: type1229, subtype: subtype1229 },function(ajaxresult){ \$(‘#getrequest1229’).html(ajaxresult); qid1229=\$(‘#qid1229’).val(”); section1229=\$(‘#section1229’).val(”); type1229=\$(‘#type1229’).val(”); subtype1229=\$(‘#subtype1229’).val(”); }); }); }); Explanation:- Answer : D
Q37. Which of the following methods is used to control temperature in resistance furnaces ?
A.  Variation of resistance
B.  Variation of voltage
C.  Periodical switching on and off of the supply
D.  All of the above methods
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Q38. Radiant heating is used for which of the following ?
A.  Annealing of metals
B.  Melting of ferrous metals
C.  Heating of liquids in electric kettle
D.  Drying of paints and varnishes
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Q39. ____ has the highest value of thermal conductivity.
A.  Copper
B.  Aluminium
C.  Brass