76. The intercooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p1 = Intake pressure of air, p2 = Intercooler pressure, and p3 = Delivery pressure of air)
77. The pressure of air at the beginning of the compression stroke is __________ the atmospheric pressure.
78. The pressure ratio in a centrifugal compressor can be increased by increasing the tip speed and lowering the inlet temperature.
79. Free air is the air at atmospheric conditions at any specific location.
80. A gas turbine used in air-craft should have low weight and small frontal area.
81. A closed cycle gas turbine works on
82. The clearance, in a single stage, single acting reciprocating air compressor does not effect the workdone on the air and the power required for compressing the air.
83. Air motors work on the cycle which is the reverse of the reciprocating air compressor cycle.
84. Which of the following statement is correct relating to rocket engines ?
85. In reciprocating air compressors, isothermal efficiency is used for all sorts of calculations.
86. Euler's equation can be used for
87. A rocket engine uses __________ for the combustion of its fuel.
88. The perfect intercooling, in multistage compression, means that the temperature of air at inlet to subsequent stages is equal to the initial temperature.
89. In a compressed air system, the temperature of air discharged from the air motor is __________ than the initial compressor intake temperature.
90. The efficiency of roots blower __________ with the increase in pressure ratio.
91. The operation of lifts, rams and pumps make use of compressed air.
92. A jet engine has
93. A receiver in compressor installations is used to damp pressure waves in compressor discharge.
94. A compressor at high altitudes will require __________ power.
95. The mean effective pressure of the compressor is the
96. The reason for volumetric efficiency of reciprocating compressor being less than 100 percent is
97. For minimum work in multi-stage compression, the workdone on all stages should be equal.
98. The thrust of a jet propulsion power unit can be increased by
99. Slip factor in a centrifugal compressor indicates the amount of air leaked from the storage vessel.
100. The ratio of the isentropic work to the Euler's work is known as pressure coefficient.