Related Questions

Isothermal compression efficiency, even when running at high speed, can be approached by using
A Multistage compression
B Cold water spray
C Both (A) and (B) above
D Fully insulating the cylinder
In multistage compressor, the isothermal compression is achieved by
A Employing inter-cooler
B By constantly cooling the cylinder
C By running compressor at very slow speed
D By insulating the cylinder
The overall isothermal efficiency of the compressor is defined as the ratio of
A Work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio
B Isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor
C Volume of free air delivery per stroke to the swept volume of the piston
D Isentropic power to the power required to drive the compressor
The overall isothermal efficiency of compressor is defined as the ratio of
A Isothermal h.p. to the BHP of motor
B Isothermal h.p. to adiabatic h.p.
C Power to drive compressor to isothermal h.p.
D Work to compress air isothermally to work for actual compression
The work done in isothermal compression compared to that in adiabatic compression will be
A Less
B More
C Same
D More or less depending upon the extent of work done
For a two stage compressor, if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will
A Increase
B Decrease
C Remain unaffected
D Other factors control it
Volumetric efficiency of a compressor decreases with ________ in compression ratio.
A Decrease
B Increase
C Remain same
D Does not change
The volumetric efficiency of compressor with increase in compression ratio will
A Increase
B Decrease
C Remain same
D May increase or decrease depending on clearance volume
With increase in compression ratio, the volumetric efficiency of air compressor
A Increases
B Decreases
C Remains same
D May increase or decrease (depends on the suction pressure)
Axial flow compressor has the following advantage over centrifugal compressor
A Larger air handling ability per unit frontal area
B Higher pressure ratio per stage
C Aerofoil blades are used
D Higher average velocities

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