51. In a centrifugal compressor, the ratio of the __________ to the blade velocity is called slip factor.
52. In a turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in
53. The air is delivered __________ in one revolution in case of a three-lobbed rotor.
54. The performance of air compressor at high altitudes will be __________ as compared to that at sea level.
55. In a centrifugal compressor, the highest Mach number leading to shock wave in the fluid flow occurs at
56. In a centrifugal compressor, the air enters the impeller axially and leaves the vane radially.
57. In gas turbines, the work input with intercooling is __________ the work input with no intercooling.
58. The compressor capacity will be __________ if the temperature of intake air is lowest.
59. For perfect intercooling in a three stage compressor,
60. A machine used to raise the pressure of air is called
61. The overall efficiency of the compressed air system is the
62. In a jet engine, the compression varies as the square of the speed.
63. In a single acting reciprocating air compressor, without clearance, the compression of air may be
64. The axial flow compressor is preferred in air-craft gas turbines because of
65. Which of the following statement is correct as regard to centrifugal compressors?
66. The ratio of the net work obtained from the gas turbine plant to the turbine work is known as
67. The process, which causes the air to enter the impeller blades of a centrifugal compressor at __________ velocity (without effecting the mass of air to flow and velocity of flow) is known as prewhirl.
68. In jet propulsion power unit, the inlet duct of diverging shape is used for converting kinetic energy of air into pressure energy.
69. The temperature of air at the beginning of the compression stroke is __________ the atmospheric temperature.
70. The compressor efficiency is defined as the ratio of volume of free air delivery per stroke to the swept volume of the piston.
71. In a gas turbine, air is obtained from the atmosphere and compressed in an air compressor.
72. In open cycle turbo-jet engines used in military aircraft, reheating the exhaust gas from the turbine by burning, more fuel is used to increase the
73. Gas turbine as compared to internal combustion engine
74. A closed cycle gas turbine consists of a
75. For maximum work, the reheating should be done to an intermediate pressure of (where p1 = Maximum pressure, and p2 = Minimum pressure)