Related Questions

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
If the flow of air through the compressor is parallel to its axis, then the compressor is
A Reciprocating compressor
B Centrifugal compressor
C Axial flow compressor
D Turbo compressor
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 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 order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis.
A Equal to
B Twice
C Three times
D Four times
If the flow of air through the compressor is perpendicular to its axis, then it is a
A Reciprocating compressor
B Centrifugal compressor
C Axial flow compressor
D Turbo compressor
In a centrifugal compressor, the highest Mach number leading to shock wave in the fluid flow occurs at
A Diffuser inlet radius
B Diffuser outlet radius
C Impeller inlet radius
D Impeller outlet radius
Horsepower increase of a centrifugal gas compressor without altering the volumetric flow rate will __________ the gas discharge pressure.
A Increase
B Decrease
C Not change
D Exponentially decrease
In an axial flow compressor, the ratio of pressure in the rotor blades to the pressure rise in the compressor in one stage is known as
A Work factor
B Slip factor
C Degree of reaction
D Pressure coefficient
In a centrifugal compressor, the ratio of the ________ to the blade velocity is called slip factor.
A Inlet whirl velocity
B Outlet whirl velocity
C Inlet velocity of flow
D Outlet velocity of flow

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