Flow of Fluids Flashcards
The viscosity of a gas
a. decreases with increase in temperature
b. increases with increase in temperature
c. is independent of temperature
d. is independent of pressure for very high pressure intensities
b
The dimensionless number that characterizes the flows of fluid in a
conduit.
Reynolds Number
Turbulent flow generally occurs for cases involving
a. viscous fluid
b. very narrow passages for capillary tube
c. very slow motions
d. none of these
d
When a fluid flows through a reducer in a piping system, the velocity
at the outlet end is _ the velocity at the inlet.
more than
For pipes that must be broken at intervals for maintenance, the
connector used should be a/an
union
Which valve is used accurately to regulate the flow of liquids and
gases at low flow rates?
needle valve
Which of the following is not true?
a. A pump will operate safely if its NPSH is greater than zero.
b. Fans and blowers are used to transport gases.
c. Pumps and blowers increase the mechanical energy of the fluid.
d. The power loss due to friction in a venturi meter is greater than in
an orifice meter.
d
Which statement is not true?
a. Potential flow is a flow of compressible fluids with no shear.
b. Rotameters are variable-head meters.
c. There are 8 schedule numbers in used for standard pipes.
d. Roughness has no appreciable effect on the friction factor when
flow is laminar.
c
For the laminar flow of a fluid in a circular pipe of radius R, the Hagen-Poiseuille equation predict the volumetric flowrate to be proportional to
R^4
Pipes having diameter 14 inches or more are designated by their
Outside diameter
When the flow is laminar
a. the pressure drop is proportional to the square of the velocity.
b. the pressure drop is not affected by the velocity.
c. the pressure drop is proportional to the first power of the velocity.
d. the pressure drop is inversely proportional to the velocity.
c
Most commonly used joint in the underground pipe lines is the
sleeve joint
Schedule number of a pipe, which is a measure of its wall thickness, is given by
1000 Pā/S
Water hammer in a pipeline results from the
a. bursting of pipelines due to closure by a valve.
b. pressure increase due to closure of a valve resulting in decrease in rate of flow.
c. rapid pressure change due to a rapid change in the rate of flow.
d. None of these
c
Molten soap mass is transported by a _____ pump.
gear
