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MCQs

Total Questions : 757 | Page 7 of 76 pages
Question 61. Reverberatory furnace is used for
  1.    Roasting/reduction of ores
  2.    Annealing steel coil
  3.    Heating air
  4.    Steel melting
 Discuss Question
Answer: Option A. -> Roasting/reduction of ores
Question 62. Which of the following is the most important deterrants to an extended use of pulverised coal in boiler firing?
  1.    Ash disposal problem
  2.    Excessive fly ash discharge from the stack
  3.    Higher power consumption in its transportation
  4.    Erosion of induced draft fan blades
 Discuss Question
Answer: Option A. -> Ash disposal problem
Question 63. Circulation of gases in furnace is caused by the
  1.    Change in volume during a change of temperature
  2.    Difference in density between hot and cold gases
  3.    Furnace pressure in conjunction with draft in flues
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 64. Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.
  1.    350
  2.    750
  3.    1050
  4.    1250
 Discuss Question
Answer: Option B. -> 750
Question 65. Rate of heat release in a furnace, which is the measure of heat intensity is defined as
  1.    Kcal/hr/m³ combustion space
  2.    Kcal/m³ combustion space
  3.    Kcal/hr
  4.    None of these
 Discuss Question
Answer: Option A. -> Kcal/hr/m³ combustion space
Question 66. Advantages of use of preheated combustion air are
  1.    Saving in fuel consumption
  2.    Reduction in scale losses
  3.    Increase in flame temperature
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 67. Which of the following is a batch furnace?
  1.    Cupola
  2.    Reheating furnace
  3.    Glass tank furnace
  4.    None of these
 Discuss Question
Answer: Option A. -> Cupola
Question 68. In salt bath furnace, heat is transferred to the charge mainly by
  1.    Conduction
  2.    Convection
  3.    Radiation
  4.    None of these
 Discuss Question
Answer: Option A. -> Conduction
Question 69. Which of the following is a rotary furnace?
  1.    Lime kiln
  2.    Soaking pit
  3.    Stoves
  4.    Annealing furnace
 Discuss Question
Answer: Option A. -> Lime kiln
Question 70. Large tonnage of refractory bricks are dried in a
  1.    Shaft furnace
  2.    Rotary hearth furnace
  3.    Tunnel kiln
  4.    Muffle furnace
 Discuss Question
Answer: Option C. -> Tunnel kiln

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