Related Questions

Stalling of blades in axial flow compressor is the phenomenon of
A Air stream blocking the passage
B Motion of air at sonic velocity
C Unsteady periodic and reversed flow
D Air stream not able to follow the blade contour
The ratio of the increase in pressure in rotor blades to total increase in pressure in the stage is called
A Pressure ratio
B Pressure coefficient
C Degree of reaction
D Slip factor
The degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the
A Rotor to static enthalpy rise in the stator
B Stator to static enthalpy rise in the rotor
C Rotor to static enthalpy rise in the stage
D Stator to static enthalpy rise in the stage
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
The maximum compression ratio in an actual single stage axial flow compressor is of the order of
A 1 : 1.2
B 1 : 2
C 1 : 5
D 1 : 10
The process, which causes the air to enter the impeller blades of a centrifugal compressor at ________ velocity (without effecting the mass of air to flow and velocity of flow) is known as prewhirl.
A Reduced
B Increased
C Zero
D None of these
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
The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost are P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet.
A P, Q and R
B P and R
C R and S
D P, R and S
In axial flow compressor, exit flow angle deviation from the blade angle is a function of
A Blade camber
B Blade camber and incidence angle
C Space-chord ratio
D Blade camber and space-chord ratio
The ratio of the workdone on the blades to the energy supplied to the blades, is called
A Blading efficiency
B Nozzle efficiency
C Gross or stage efficiency
D Mechanical efficiency

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