81. In a high pressure compressor, the delivery pressure is
1 to 5 bar
5 to 8 bar
8 to 10 bar
10 to 15 bar
✅ The correct answer is option C.
Compressors, Gas Dynamics and Gas Turbines MCQs
82. 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)
p2 = p1 x p3
p2 = p1/p3
p2 = p1 x p3
p2 = p3/p1
✅ The correct answer is option C.
83. The ratio of the discharge pressure to the inlet pressure of air is called
compression ratio
expansion ratio
compressor efficiency
volumetric efficiency
✅ The correct answer is option A.
84. A centrifugal compressor is an axial flow compressor.
Correct
Incorrect
✅ The correct answer is option B.
85. The ratio of the isothermal power to the shaft power or brake power of the motor or engine required to drive the compressor is called overall isothermal efficiency.
TRUE
FALSE
✅ The correct answer is option A.
86. The temperature of air at the beginning of the compression stroke is __________ the atmospheric temperature.
equal to
less than
more than
✅ The correct answer is option C.
87. The pressure of air at the beginning of the compression stroke is __________ the atmospheric pressure.
equal to
less than
more than
✅ The correct answer is option B.
88. The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)
rγ – 1
1 – rγ – 1
✅ The correct answer is option C.
89. Air motors work on the cycle which is the reverse of the reciprocating air compressor cycle.
Agree
Disagree
✅ The correct answer is option A.
90. The compressor efficiency is defined as the ratio of volume of free air delivery per stroke to the swept volume of the piston.
Correct
Incorrect
✅ The correct answer is option B.