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.Management Sciences
Category: Fluid Mechanics for Chemical
For a given Reynolds number, in a hydraulically smooth pipe, further smoothening ____________ the friction factor?
A. Brings about no further reduction of
B. Increases
C. Decreases
D. None of these
At low Reynolds number______________?
A. Viscous forces are unimportant
B. Viscous forces control
C. Viscous forces control and inertial forces are unimportant
D. Gravity forces control
With increase in molecular weight of the gas, the head developed by a centrifugal compressor will________________?
A. Decrease
B. Increase
C. Remain same
D. Unpredictable
Hydraulic mean depth (Dm) for a circular pipe of diameter ‘D’ flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum ?
A. Flow rate
B. Mean velocity
C. Both ‘a’ & ‘b’
D. Neither ‘a’ nor ‘b’
It is possible to integrate an automatic flow controller to a________________?
A. Flow nozzle
B. Venturimeter
C. Rotameter
D. None of these
____________ flow means the flow of incompressible fluid with no shear ?
A. Potential
B. Streamline
C. Creep
D. Boundary layer
The centre of pressure is_________________?
A. Always below the centroid of the area
B. Always above the centroid of the area
C. A point on the line of action of the resultant force
D. At the centroid of the submerged area
Various efficiencies of a centrifugal pump are related as (where, εm = mechanical efficiency εv = volumetric efficiency. εma = manometric efficiency εo = overall efficiency) ?
A. ηma × ηm × ηv = ηo
B. ηm = ηv . ηma
C. ηma = ηm × ηv
D. ηv = ηm × ηma
Terminal velocity is_____________________?
A. A constant velocity with no acceleration
B. A fluctuating velocity
C. Attained after moving one-half of total distance
D. None of these
Which of the following is a dimensionless parameter ?
A. Angular velocity
B. Specific weight
C. Kinematic viscosity
D. None of these
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