Fluid Mechanics
Multistage compressors are used in industry, because they

Reduce the cost of compressor
Resemble closely to isothermal compression
Are easy to control
Reduce the size requirement

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Fluid Mechanics
Vane anemometer

Is a variable head meter
None of these
Rotates an element at a speed determined by the velocity of the fluid in which the meter is immersed
Is an area meter

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Fluid Mechanics
Steady flow occurs, when the

Rate of the velocity change is constant
Conditions are the same at the adjacent points at any instant
Conditions change steadily with time
Conditions do not change with time at any point

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