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MCQs

Total Questions : 1935 | Page 22 of 194 pages
Question 211. The ratio of the work-done on the blades per kg of steam to the total energy supplied per stage per kg of steam is called
  1.    Blading efficiency
  2.    Nozzle efficiency
  3.    Stage efficiency
  4.    Mechanical efficiency
 Discuss Question
Answer: Option C. -> Stage efficiency
Question 212. The device attached to the steam chest for preventing explosions due to excessive internal pressure of steam is called
  1.    Safety valve
  2.    Water level indicator
  3.    Pressure gauge
  4.    Fusible plug
 Discuss Question
Answer: Option A. -> Safety valve
Question 213. In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be
  1.    56 %
  2.    63 %
  3.    74 %
  4.    78 %
 Discuss Question
Answer: Option B. -> 63 %
Question 214. Steam turbines may be classified according to
  1.    Direction of steam flow
  2.    Number of stages
  3.    Mode of steam action
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 215. At critical point, i.e. p=225.65 kg/cm², the latent enthalpy of vaporisation is
  1.    Maximum
  2.    Minimum
  3.    Zero
  4.    Depends on temperature also
 Discuss Question
Answer: Option C. -> Zero
Question 216. The high steam and low water safety valve is used to blow off steam when the
  1.    Steam pressure exceeds the working pressure
  2.    Water level in the boiler becomes too low
  3.    Both (A) and (B)
  4.    None of the above
 Discuss Question
Answer: Option C. -> Both (A) and (B)
Question 217. For the same diameter and thickness of tube, a water tube boiler has ________ heating surface as compared to fire tube boiler.
  1.    More
  2.    Less
  3.    Equal
  4.    None of these
 Discuss Question
Answer: Option A. -> More
Question 218. Which of the following is a fire tube boiler?
  1.    Lancashire boiler
  2.    Babcock and Wilcox boiler
  3.    Yarrow boiler
  4.    None of these
 Discuss Question
Answer: Option A. -> Lancashire boiler
Question 219. Which of the following is a fire tube boiler?
  1.    Locomotive boiler
  2.    Babcock and Wilcox boiler
  3.    Stirling boiler
  4.    All of the above
 Discuss Question
Answer: Option A. -> Locomotive boiler
Question 220. In fire tube boilers
  1.    Water passes through the tubes which are surrounded by flames and hot gases
  2.    The flames and hot gases pass through the tubes which are surrounded by water
  3.    Forced circulation takes place
  4.    None of these
 Discuss Question
Answer: Option B. -> The flames and hot gases pass through the tubes which are surrounded by water

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