Related Questions

Mach number is defined as the ratio of the local flow velocity to the sonic velocity in the fluid. For what value of Mach number, the gases are considered incompressible?
A [

A.

B. > 3

B 50
C 1
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
In a centrifugal compressor, the flow of air is ________ to the axis of compressor.
A Parallel
B Perpendicular
C Inclined
D None of these
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
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
In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant?
A Rotational
B Unsteady
C Turbulent
D Non-uniform
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
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
The Mach number for hypersonic flow of compressible fluid is
A 1
B > 1
C > 4
Mach number is important in a fluid flow problem, when the inertia and __________ forces predominate.
A Elastic
B Viscous
C Gravity
D None of these

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