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MCQs

Total Questions : 53 | Page 4 of 6 pages
Question 31. In resistance heating highest working temperature is obtained from heating elements made of
  1.    Nickel copper
  2.    Nichrome
  3.    Silicon carbide
  4.    Silver
 Discuss Question
Answer: Option C. -> Silicon carbide
Question 32. A non-dimensional number generally associated with natural convection heat transfer is
  1.    Prandtl number
  2.    Grashoff number
  3.    Peclet number
  4.    Nusselt number
 Discuss Question
Answer: Option B. -> Grashoff number
Question 33. Method has leading power factor
  1.    Resistance heating
  2.    Dielectric heating
  3.    Arc heating
  4.    Induction heating
 Discuss Question
Answer: Option B. -> Dielectric heating
Question 34. Ajax Wyatt furnace is started when
  1.    It is filled below core level
  2.    It is filled above core level
  3.    It is fully empty
  4.    None of the above
 Discuss Question
Answer: Option B. -> It is filled above core level
Question 35. The process of heat transfer during the re-entry of satellites and missiles, at very high speeds, into earth?s atmosphere is known as
  1.    Ablation
  2.    Radiation
  3.    Viscous dissipation
  4.    Irradiation
 Discuss Question
Answer: Option A. -> Ablation
Question 36. In the indirect resistance heating method, maximum heat-transfer takes place by
  1.    Radiation
  2.    Convection
  3.    Conduction
  4.    Any of the above
 Discuss Question
Answer: Option A. -> Radiation
Question 37. Induction heating process is based on which of the following principles?
  1.    Thermal ion release principle
  2.    Nucleate heating principle
  3.    Resistance heating principle
  4.    Electromagnetic induction principle
 Discuss Question
Answer: Option D. -> Electromagnetic induction principle
Question 38. ________ is used for heating non-conducting materials.
  1.    Eddy current heating
  2.    Arc heating
  3.    Induction heating
  4.    Dielectric heating
 Discuss Question
Answer: Option D. -> Dielectric heating
Question 39. Which of the following devices is necessarily required for automatic temperature control in a furnace?
  1.    Thermostat
  2.    Thermocouple
  3.    Autotransformer
  4.    Heating elements of variable resistance material
 Discuss Question
Answer: Option B. -> Thermocouple
Question 40. Direct arc furnaces have which of the following power factors?
  1.    Unity
  2.    Low, lagging
  3.    Low, leading
  4.    Any of the above
 Discuss Question
Answer: Option B. -> Low, lagging

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