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MCQs

Total Questions : 765 | Page 72 of 77 pages
Question 711. The work ratio of simple gas turbine cycle depends on
  1.    Maximum cycle temperature
  2.    Pressure ratio
  3.    Minimum cycle temperature
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 712. There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would
  1.    Decrease
  2.    Increase
  3.    None of these
  4.    Remain same
 Discuss Question
Answer: Option B. -> Increase
Question 713. Phenomenon of choking in compressor means
  1.    Fixed mass flow rate regardless of pressure ratio
  2.    No flow of air
  3.    Increased inclination of chord with air steam
  4.    Reducing mass flow rate with increase in pressure ratio
 Discuss Question
Answer: Option A. -> Fixed mass flow rate regardless of pressure ratio
Question 714. The ideal efficiency of simple gas turbine cycle depends on
  1.    Minimum cycle temperature
  2.    Maximum cycle temperature
  3.    Pressure ratio
  4.    All of these
 Discuss Question
Answer: Option C. -> Pressure ratio
Question 715. Reheating in a multistage expansion gas turbine ________ compressor work.
  1.    None of these
  2.    Decreases
  3.    Has no effect on
  4.    Increases
 Discuss Question
Answer: Option B. -> Decreases
Question 716. Ratio of indicated H.P. and brake H.P. is known as
  1.    Adiabatic efficiency
  2.    Isothermal efficiency
  3.    Volumetric efficiency
  4.    Mechanical efficiency
 Discuss Question
Answer: Option D. -> Mechanical efficiency
Question 717. The output of a gas turbine is 300 KW and its efficiency is 20 percent, the heat supplied is
  1.    15 KW
  2.    6000 KW
  3.    600 KW
  4.    150 KW
 Discuss Question
Answer: Option A. -> 15 KW
Question 718. Reheating in a gas turbine
  1.    Increases the compressor work
  2.    Decreases the thermal efficiency
  3.    Increases the turbine work
  4.    Increases the thermal efficiency
 Discuss Question
Answer: Option D. -> Increases the thermal efficiency
Question 719. In axial flow compressor, exit flow angle deviation from the blade angle is a function of
  1.    Blade camber and space-chord ratio
  2.    Space-chord ratio
  3.    Blade camber and incidence angle
  4.    Blade camber
 Discuss Question
Answer: Option C. -> Blade camber and incidence angle
Question 720. Ratio of indicated h.p. to shaft h.p. in known as
  1.    Mechanical efficiency
  2.    Isothermal efficiency
  3.    Compressor efficiency
  4.    Volumetric efficiency
 Discuss Question
Answer: Option A. -> Mechanical efficiency

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