equal to
less than
more than
✅ The correct answer is option C.
Compressors
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.
A centrifugal compressor is an axial flow compressor.
Correct
Incorrect
✅ The correct answer is option B.
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.
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.
For a multi-stage compressor, the polytropic efficiency is constant throughout for all the stages.
TRUE
FALSE
✅ The correct answer is option A.
The compressor capacity will be __________ if the temperature of intake air is lowest.
lowest
highest
✅ The correct answer is option B.
The volumetric efficiency of the compressor is defined as the ratio of volume of free air delivery per stroke to the swept volume of the piston.
Yes
No
✅ The correct answer is option A.
The efficiency of roots blower __________ with the increase in pressure ratio.
decreases
increases
does not change
✅ The correct answer is option A.
A closed cycle gas turbine works on
Carnot cycle
Rankine cycle
Ericsson cycle
Joule cycle
✅ The correct answer is option D.