28. When the temperature of air leaving the intercooler, in a two stage compression with intercooler, is __________ the original atmospheric air temperature, then the intercooling is known as perfect or complete intercooling.
29. The actual volume of air delivered by a compressor, When reduced to the normal temperature and pressure conditions is called compressor capacity.
30. The compression ratio in a gas turbine is
31. Intercooling in compressors results in saving of power in compressing given volume of air to a given pressure.
32. Only rocket engines can be propelled to space because
33. The maximum combustion pressure in gas turbine is __________ as compared to I.C. engine.
34. An aftercooler is used to
35. High air-fuel ratio in gas turbines
36. The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as
37. If p1, is the pressure of air entering the L.P. cylinder and p2 is the pressure of air leaving the L.P. cylinder (or intercooler pressure), then the ratio of cylinder diameters for a single acting, two stage reciprocating air compressor with complete intercooling is given by (where D1 = Dia. of L.P. cylinder, and D2 = Dia. of H.P. cylinder)
38. The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor, is called
39. The increase in pressure in a roots blower is entirely due to back flow of air.
40. The type of rotary compressor used in aeroplanes, is of
41. An axial compressor gives optimum performance at high speeds and large volume flows.
42. In a reciprocating air compressor, the compression work per kg of air
43. The degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the
44. If p1 is the pressure of air entering the L.P, cylinder and p3 is the pressure of air leaving the H.P. cylinder, then the ratio of cylinder diameters for a single acting, two stage reciprocating compressor with complete intercooling is given by
45. Reheating in a gas turbine
46. In a single stage, single acting reciprocating air compressor, without clearance, the workdone on the air during isentropic compression is __________ the heat required to raise the temperature of air from T1 to T2 at a constant pressure.
47. Workdone by an air compressor __________ upon the way in which the air is compressed.
48. In a compressor, work is done on the piston during suction of air and work is done by the piston during compression as well as delivery of air.
49. Maximum work is saved in a two stage reciprocating air compressor with incomplete intercooling.
50. The mass of gas turbine per kW developed is about __________ as that of an I.C. engine.