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Standard air is the air at

A. Atmospheric conditions at any specific location

B. 20°C and 1 kg/cm² and relative humidity 36%

C. 0°C and standard atmospheric conditions

D. 15°C and 1 kg/cm²

Correct Answer : B.


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  1. The mean effective pressure of the compressor is the
  2. A machine used to raise the pressure of air is called
  3. For maximum work, the reheating should be done to an intermediate pressure of (Where p₁ = Maximum…
  4. The mass of gas turbine per kW developed is about ________ as that of an I.C. engine.
  5. The indicated work per unit mass of air delivered is
  6. The ratio of specific weight/h.p. of gas turbine and I.C engines may be typically of the order of
  7. Free air is the air at
  8. Water is injected in gas turbine cycle to
  9. In jet engines, for the efficient production of large power, fuel is burnt in an atmosphere of
  10. A compressor at high altitudes will require ________ power.
  11. Air-fuel ratio in a jet engine will be of the order of
  12. For slow speed large capacity compressor, following type of valve will be best suited
  13. The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in…
  14. In air compressors, free air delivery means the
  15. A rocket engine for the combustion of its fuel
  16. If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches
  17. Gas turbine as compared to internal combustion engine
  18. The maximum delivery pressure in a rotary air compressor is
  19. The closed cycle in gas turbines
  20. The volumetric efficiency of compressor with increase in compression ratio will
  21. In a single stage, single acting reciprocating air compressor, without clearance volume, the workdone…
  22. Which is false statement about multistage compression?
  23. The pressure ratio for an open cycle gas turbine compared to closed cycle gas turbine of same h.p. is
  24. Mechanical efficiency of gas turbines as compared to I.C engines is
  25. The net work input required for compressor with increase in clearance volume
  26. Maximum delivery pressure is a rotary air compressor is of the order of
  27. Inter-cooling in multistage compressors is done
  28. Which one of the following is the effect of blade shape on performance of a centrifugal compressor?
  29. The ratio of isentropic work to Euler work is known as
  30. More than one stage will be preferred for reciprocating compressor if the delivery pressure is more…