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MCQs

Total Questions : 53 | Page 5 of 6 pages
Question 41. Which of the following insulating materials was suitable for low temperature applications?
  1.    Asbestos paper
  2.    Diatomaceous earth
  3.    80 percent magnesia
  4.    Cork
 Discuss Question
Answer: Option B. -> Diatomaceous earth
Question 42. By which of the following methods the temperature inside arcane can be varied?
  1.    By disconnecting some of the heating elements
  2.    By varying the operating voltage
  3.    By varying the current through heating elements
  4.    By any of the above method
 Discuss Question
Answer: Option D. -> By any of the above method
Question 43. Which of the following methods is used to control temperature in resistance furnaces?
  1.    Variation of resistance
  2.    Variation of voltage
  3.    Periodical switching on and off of the supply
  4.    All of the above methods
 Discuss Question
Answer: Option D. -> All of the above methods
Question 44. It is desirable to operate the arc furnaces at power factor of
  1.    Zero
  2.    0.707 lagging
  3.    Unity
  4.    0.707 leading
 Discuss Question
Answer: Option B. -> 0.707 lagging
Question 45. In an electric room heat convector the method of heating used is Resistance heating
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 46. Resistance variation method of temperature control is done by connecting resistance elements in
  1.    Series
  2.    Parallel
  3.    Series-parallel connections
  4.    All of the above ways
 Discuss Question
Answer: Option D. -> All of the above ways
Question 47. In heating the ferromagnetic material by induction heating, heat is produced due to
  1.    Induced current flow through the charge
  2.    Hysteresis loss taking place below Curie temperature
  3.    Due to hysteresis loss as well as eddy current loss taking place in the charge
  4.    None of the above factors
 Discuss Question
Answer: Option C. -> Due to hysteresis loss as well as eddy current loss taking place in the charge
Question 48. Which of the following is an advantage of heating by electricity?
  1.    Quicker operation
  2.    Higher efficiency
  3.    Absence of flue gases
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 49. In a domestic cake baking oven the temperature is controlled by
  1.    Voltage variation
  2.    Thermostat
  3.    Autotransformer
  4.    Series-parallel operation
 Discuss Question
Answer: Option D. -> Series-parallel operation
Question 50. Which of the following will happen if the thickness of refractory wall of furnace is increased?
  1.    Heat loss through furnace wall will increase
  2.    Temperature inside the furnace will fall
  3.    Temperature on the outer surface of furnace walls will drop
  4.    Energy consumption will increase
 Discuss Question
Answer: Option C. -> Temperature on the outer surface of furnace walls will drop

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