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MCQs

Total Questions : 53 | Page 3 of 6 pages
Question 21. Which of the following is an advantage of eddy current heating?
  1.    The amount of heat generated can be controlled accurately
  2.    Heat at very high rate can be generated
  3.    The area of the surface over which heat is produced can be accurately controlled
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 22. Properly of low temperature coefficient of heating element is desired due to which of the following reasons?
  1.    To avoid initial rush of current
  2.    To avoid change in kW rating with temperature
  3.    Both (A) and (B)
  4.    Either (A) or (B)
 Discuss Question
Answer: Option C. -> Both (A) and (B)
Question 23. Heat is transferred simultaneously by condition, convection and radiation
  1.    Inside boiler furnaces
  2.    During melting of ice
  3.    Through the surface of the insulted pipe carrying steam
  4.    From refrigerator coils to freezer of a refrigerator
 Discuss Question
Answer: Option A. -> Inside boiler furnaces
Question 24. Hysteresis loss and eddy current loss are used in
  1.    Induction heating of steel
  2.    Dielectric heating
  3.    Induction heating of brass
  4.    Resistance heating
 Discuss Question
Answer: Option A. -> Induction heating of steel
Question 25. For radiant heating around 2250°C, the heating elements are made of
  1.    Copper alloy
  2.    Carbon
  3.    Tungsten alloy
  4.    Stainless steel alloy
 Discuss Question
Answer: Option C. -> Tungsten alloy
Question 26. Which of the following methods of heating is not dependent on the frequency of supply?
  1.    Induction heating
  2.    Dielectric heating
  3.    Electric resistance heating
  4.    All of the above
 Discuss Question
Answer: Option C. -> Electric resistance heating
Question 27. In arc furnace the function of choke is
  1.    To stabilize the arc
  2.    To improve power factor
  3.    To reduce severity of the surge
  4.    None of the above
 Discuss Question
Answer: Option A. -> To stabilize the arc
Question 28. ________ has the highest value of thermal conductivity.
  1.    Copper
  2.    Aluminium
  3.    Brass
  4.    Steel
 Discuss Question
Answer: Option A. -> Copper
Question 29. Induction heating takes place it which of the following?
  1.    Insulating materials
  2.    Conducting materials which are magnetic
  3.    Conducting materials which are non-magnetic
  4.    Conducting materials which may or may not be magnetic
 Discuss Question
Answer: Option D. -> Conducting materials which may or may not be magnetic
Question 30. Which of the following has the highest value of thermal conductivity?
  1.    Water
  2.    Steam
  3.    Solid ice
  4.    Melting ice
 Discuss Question
Answer: Option C. -> Solid ice

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