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MCQs

Total Questions : 765 | Page 9 of 77 pages
Question 81. Inter cooling in compressors
  1.    Cools the delivered air
  2.    Results in saving of power in compressing a given volume to given pressure
  3.    Is the standard practice for big compressors
  4.    Enables compression in two stages
 Discuss Question
Answer: Option B. -> Results in saving of power in compressing a given volume to given pressure
Question 82. Isothermal compression efficiency can be attained by running the compressor
  1.    At very high speed
  2.    At very slow speed
  3.    At average speed
  4.    At zero speed
 Discuss Question
Answer: Option B. -> At very slow speed
Question 83. Fighter bombers use following type of engine
  1.    Turbojet
  2.    Turbo-propeller
  3.    Rocket
  4.    Ramjet
 Discuss Question
Answer: Option A. -> Turbojet
Question 84. The process, which causes the air to enter the impeller blades of a centrifugal compressor at ________ velocity (without effecting the mass of air to flow and velocity of flow) is known as prewhirl.
  1.    Reduced
  2.    Increased
  3.    Zero
  4.    None of these
 Discuss Question
Answer: Option A. -> Reduced
Question 85. For a two stage compressor, if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will
  1.    Increase
  2.    Decrease
  3.    Remain unaffected
  4.    Other factors control it
 Discuss Question
Answer: Option A. -> Increase
Question 86. High air-fuel ratio in gas turbines
  1.    Increases power output
  2.    Improves thermal efficiency
  3.    Reduces exhaust temperature
  4.    Do not damage turbine blades
 Discuss Question
Answer: Option C. -> Reduces exhaust temperature
Question 87. In the axial flow gas turbine, the work ratio is the ratio of
  1.    Compressor work and turbine work
  2.    Output and input
  3.    Actual total head temperature drop to the isentropic total head drop from total head inlet to static head outlet
  4.    Actual compressor work and theoretical compressor work
 Discuss Question
Answer: Option C. -> Actual total head temperature drop to the isentropic total head drop from total head inlet to static head outlet
Question 88. The power available for takeoff and climb in case of turbojet engine as compared to reciprocating engine is
  1.    Less
  2.    More
  3.    Same
  4.    May be less or more depending on ambient conditions
 Discuss Question
Answer: Option A. -> Less
Question 89. Which of the following statement is correct relating to rocket engines?
  1.    The combustion chamber in a rocket engine is directly analogous to the reservoir of a supersonic wind tunnel
  2.    The stagnation conditions exist at the combustion chamber
  3.    The exit velocities of exhaust gases are much higher than those in jet engine
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 90. Gas turbines use following type of air compressor
  1.    Centrifugal type
  2.    Reciprocating type
  3.    Lobe type
  4.    Axial flow type
 Discuss Question
Answer: Option D. -> Axial flow type

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