Related Questions

In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by
A Convection
B Radiation
C Conduction
D Both convection and conduction
The energy loss in flow through ven-turimeter is less than that through flow nozzle, because in case of a flow nozzle, the
A Length is shorter
B Throat diameter is more
C Sudden expansion of flow in the downstream occurs
D Distance between the throat and the inlet is more
Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is
A $$\frac{{\text{Q}}}{2}$$
B $$\frac{{\text{Q}}}{4}$$
C $$\frac{{\text{Q}}}{8}$$
D $$\frac{{\text{Q}}}{{16}}$$
A flow in which the volume of a fluid and its density does not change during the flow is called _________ flow.
A Incompressible
B Compressible
C Viscous
D None of these
The velocity at which the flow changes from laminar flow to turbulent flow is called
A Critical velocity
B Velocity of approach
C Sub-sonic velocity
D Super-sonic velocity
The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be (where D is the depth of flow)
A 0.423 D
B 0.577 D
C 0.223 D
D 0.707 D
Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the
A Length of the pipe
B Diameter of the pipe
C Density of the fluid
D Velocity of the fluid
In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than
A Frictional force
B Viscosity
C Surface friction
D All of the above
The maximum discharge through a circular channel takes place, when the depth of the fluid flow is __________ times the pipe diameter.
A 0.25
B 0.5
C 0.66
D 0.95
At what value of crank angle (roughly), no flow of water from or into the air vessel takes place in case of a double acting reciprocating pump?
A 40° and 140°
B 45° and 60°
C 90° and 80°
D 20° and 120°

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