The efficiency of roots blower ________ with the increase in pressure ratio.

A. Decreases

B. Increases

C. Does not change

D. None of these

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  1. The capacity of compressor will be highest when its intake temperature is
  2. For minimum work in multistage compression, assuming same index of compression in all stages
  3. A jet engine works on the principle of conservation of
  4. The maximum temperature in a gas turbine is
  5. Mechanical efficiency of gas turbines as compared to I.C engines is
  6. The gas in cooling chamber of a closed cycle gas turbine is cooled at
  7. The main purpose of reheating in gas turbine is to
  8. The efficiency of jet engine is
  9. If the flow of air through the compressor is perpendicular to its axis, then it is a
  10. If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of…
  11. Intercooling in gas turbines
  12. The temperature of air at the beginning of the compression stroke is ________ the atmospheric temperature.
  13. In gas turbines, high thermal efficiency is obtained in
  14. Work ratio of a gas turbine plant is ratio of
  15. Volumetric efficiency of a compressor without clearance volume
  16. In a centrifugal compressor, the ratio of the ________ to the blade velocity is called slip factor.
  17. The maximum delivery pressure in a rotary air compressor is
  18. The material commonly used for air craft gas turbine is
  19. The maximum combustion pressure in gas turbine as compared to I.C. engine is
  20. A simple turbojet engine is basically
  21. To avoid moisture troubles, the branch connections from compressed air lines should be taken from
  22. The compression ratio in a gas turbine is of the order of
  23. The velocity of air entering in a rocket is ________ as compared to an aircraft.
  24. Euler's equation can be used for
  25. Which of the following plants is smallest and lightest for generating a given amount of power?
  26. In a single stage, single acting reciprocating air compressor, without clearance volume, the workdone…
  27. The workdone on a compressor will be minimum if air is taken from
  28. The assumption made in two stage compression with intercooler is that
  29. High air-fuel ratio in gas turbines
  30. The absolute pressure of air at the outlet of a compressor is called