The efficiency of jet engine is

A. Lower at low speed

B. Higher at high altitudes

C. Same at all altitudes

D. Higher at high speed

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  1. For minimum work required to compress and deliver a quantity of air by multistage compression
  2. Aeroplanes employ following type of compressor
  3. The process, which causes the air to enter the impeller blades of a centrifugal compressor at ________…
  4. In a single acting reciprocating air compressor, without clearance, the compression of air may be
  5. The ratio of specific weight/h.p. of gas turbine and I.C engines may be typically of the order of
  6. In a turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working…
  7. In n₁ and n₂ are the indices of compression for the first and second stage of compression,…
  8. The material commonly used for air craft gas turbine is
  9. A compressor at high altitudes will require ________ power.
  10. Pick up the correct statement
  11. Inter cooling in compressors
  12. The volumetric efficiency for reciprocating air compressors is about
  13. After-cooler is used to
  14. Efficiency of gas turbine is increased by
  15. If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of…
  16. Volumetric efficiency of a compressor without clearance volume
  17. Gas turbines for power generation are normally used
  18. In a jet propulsion
  19. To avoid moisture troubles, the branch connections from compressed air lines should be taken from
  20. The axial flow compressor is preferred in aircraft gas turbines because of
  21. An aftercooler is used to
  22. The inlet pressure is always ________ the discharge pressure.
  23. Free air is the air at
  24. Ratio of indicated H.P. and brake H.P. is known as
  25. Volumetric efficiency of air compressors is of the order of
  26. Losses in a centrifugal compressor are due to
  27. If the flow of air through the compressor is perpendicular to its axis, then it is a
  28. In open cycle turbojet engines used in military aircraft, reheating the exhaust gas from the turbine…
  29. In the axial flow gas turbine, the work ratio is the ratio of
  30. When the temperature of air leaving the intercooler, in a two stage compression with intercooler, is…