In the aircraft propellers

A. The propulsive matter is caused to flow around the propelled body

B. Propulsive matter is ejected from within the propelled body

C. Its functioning does not depend on presence of air

D. All of the above

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  1. Propulsive efficiency is defined as ratio of
  2. Compression efficiency is compared against
  3. The efficiency of the vane blower is (where W₁ = Workdone due to compression, and W₂ =…
  4. In a centrifugal compressor, the ratio of the ________ to the blade velocity is called slip factor.
  5. Standard air is the air at ________ and relative humidity of 36 percent.
  6. Turbofan engine employs
  7. In a centrifugal compressor, an increase in speed at a given pressure ratio causes
  8. The working fluid in a turbine is
  9. The assumption made in two stage compression with intercooler is that
  10. Free air is the air at
  11. In which case the air-fuel ratio is likely to be maximum?
  12. For speed above 3000 km/hour, it is more advantageous to use
  13. Pick up wrong statement. Surging phenomenon in centrifugal compressor depends on
  14. For perfect intercooling in a three stage compressor
  15. In the cross compounding of the gas turbine plant
  16. The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric…
  17. The ratio of the increase in pressure in rotor blades to total increase in pressure in the stage is…
  18. Volumetric efficiency of air compressors is of the order of
  19. The ratio of the net work obtained from the gas turbine plant to the turbine work is known as
  20. High air-fuel ratio in gas turbines
  21. Inter-cooling in multistage compressors is done
  22. The ratio of the indicated power to the shaft power or brake power of the motor or engine required to…
  23. The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor…
  24. The criterion of the thermodynamic efficiency for rotary compressor is
  25. For perfect intercooling in a two stage compressor
  26. The overall isothermal efficiency of compressor is defined as the ratio of
  27. Gas turbines use following type of air compressor
  28. Isothermal compression efficiency, even when running at high speed, can be approached by using
  29. The compressor efficiency is the
  30. The pressure ratio in gas turbines is of the order of