p2 = p1 x p3
p2 = p1/p3
p2 = p1 x p3
p2 = p3/p1
✅ The correct answer is option C.
Compressors
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.
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.
A turbo-prop is preferred to turbo-jet because
it has high propulsive efficiency at high speeds
it can fly at super sonic speeds
it can fly at high elevations
it has high power for
✅ The correct answer is option D.
In a single acting reciprocating air compressor, without clearance, the compression of air may be
isothermal
polytropic
isentropic
any one of these
✅ The correct answer is option D.
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
thrust and range of aircraft
efficiency of the engine
both (a) and (b)
none of these
✅ The correct answer is option A.