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MCQs

Total Questions : 757 | Page 8 of 76 pages
Question 71. Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ °C.
  1.    80
  2.    130
  3.    180
  4.    250
 Discuss Question
Answer: Option B. -> 130
Question 72. Which furnace employs natural draft?
  1.    Coke oven
  2.    Boiler
  3.    Rotary kilns
  4.    L.D. converter
 Discuss Question
Answer: Option A. -> Coke oven
Question 73. Heat balance of furnace provides means of determining the
  1.    Thermal efficiency of the process
  2.    Sources of heat losses
  3.    Scope of reduction of heat losses
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 74. Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an
  1.    Economiser
  2.    Steam superheater
  3.    Air preheater
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 75. In producer gas making furnace, steam is added along with air to mainly control the
  1.    Fusion of coal ash & clinker formation
  2.    C. V. of producer gas
  3.    Temperature of producer gas
  4.    Tar content in producer gas
 Discuss Question
Answer: Option A. -> Fusion of coal ash & clinker formation
Question 76. An example of shaft furnace is the
  1.    L.D. converter
  2.    Glass melting tank
  3.    Blast furnace
  4.    Soaking pit
 Discuss Question
Answer: Option C. -> Blast furnace
Question 77. The thermal efficiency of a steel slab reheating furnace (walking beam type) may be about __________ percent.
  1.    15
  2.    40
  3.    70
  4.    85
 Discuss Question
Answer: Option B. -> 40
Question 78. Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.
  1.    20
  2.    40
  3.    60
  4.    80
 Discuss Question
Answer: Option D. -> 80
Question 79. Maximum thermal efficiency of boiler may be about __________ percent.
  1.    10
  2.    25
  3.    65
  4.    90
 Discuss Question
Answer: Option D. -> 90
Question 80. Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent.
  1.    10-15
  2.    25-30
  3.    45-50
  4.    65-70
 Discuss Question
Answer: Option B. -> 25-30

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