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MCQs

Total Questions : 1935 | Page 5 of 194 pages
Question 41. The maximum efficiency of a reaction turbine is
  1.    2 sin²α/(1 + sin²α)
  2.    2 cos²α/(1 + cos²α)
  3.    (1 + sin²α)/2 sin²α
  4.    (1 + cos²α)/2 cos²α
 Discuss Question
Answer: Option B. -> 2 cos²α/(1 + cos²α)
Question 42. The value of the reheat factor varies from
  1.    1.02 to 1.06
  2.    1.08 to 1.10
  3.    1.2 to 1.6
  4.    1.6 to 2
 Discuss Question
Answer: Option A. -> 1.02 to 1.06
Question 43. The shell of the Cochran boiler is made hemispherical
  1.    To give maximum space and strength
  2.    To withstand the pressure of steam inside the boiler
  3.    Both (A) and (B)
  4.    None of the above
 Discuss Question
Answer: Option C. -> Both (A) and (B)
Question 44. The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop
  1.    Remains the same
  2.    Increases
  3.    Decreases
  4.    Is unpredictable
 Discuss Question
Answer: Option C. -> Decreases
Question 45. The overall efficiency of thermal power plant is
  1.    Boiler efficiency, turbine efficiency, generator efficiency
  2.    All the three above plus gas cycle efficiency
  3.    Carnot cycle efficiency
  4.    Regenerative cycle efficiency
 Discuss Question
Answer: Option A. -> Boiler efficiency, turbine efficiency, generator efficiency
Question 46. Mechanical equivalent of heat for 1 kcal or Joule's equivalent is equal to
  1.    421 kg.m
  2.    421 kg.m
  3.    539 kg.m
  4.    102 kg.m
 Discuss Question
Answer: Option B. -> 421 kg.m
Question 47. The critical pressure ratio for initially wet steam is
  1.    0.546
  2.    0.577
  3.    0.582
  4.    0.601
 Discuss Question
Answer: Option C. -> 0.582
Question 48. An air preheater
  1.    Increases evaporative capacity of the boiler
  2.    Increases the efficiency of the boiler
  3.    Enables low grade fuel to be burnt
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 49. The purpose of governing in steam turbines is to
  1.    Maintain the speed of the turbine
  2.    Reduce the effective heat drop
  3.    Reheat the steam and improve its quality
  4.    Completely balance against end thrust
 Discuss Question
Answer: Option A. -> Maintain the speed of the turbine
Question 50. Besides mean effective pressure, the data required to determine the indicated power of an engine include
  1.    Piston diameter, length of stroke and calorific value of fuel
  2.    Piston diameter, specific fuel consumption and Calorific value of fuel
  3.    Piston diameter, length of stroke and speed of rotation
  4.    Specific fuel consumption, speed of rotation and torque
 Discuss Question
Answer: Option C. -> Piston diameter, length of stroke and speed of rotation

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