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Start Quiz  Download PDF  
Start Quiz  Download PDF  
Start Quiz  Download PDF  
Start Quiz  Download PDF  
Start Quiz  Download PDF 
You may think at first that the words "fluid" and "mechanics" should not go together. However, the ways in which fluids (gases and liquids and a few other materials) respond to forces, exert forces, and move from one place to another (their mechanics) are crucially important to many aspects of our experience and our ability to build tools.
Consider, for example, the following areas in which fluid mechanics play an important, if not fundamental, role:
* Meteorology and ocean dynamics (tsunamis, hurricanes, and tornados)
* Fluid flow within living systems (blood flow, lymph flow, air flow)
* Hydraulic machinery (jacks, pumps, lifts, steering mechanisms)
* Chemical processing and piping (pumps, reactors, separators, pipelines)
* Turbomachinery (jet engines, power plants)
* Aeronautical and ship machinery (airplanes, helicopters, boats and ships)
Question: Which of the following is an appropriate unit for fluid density?
Choices:
m[sup]3[/sup]/kg
kg/ft[sup]2[/sup]
mkg/s
lb[sub]m[/sub]/yard[sup]3[/sup]
Question: Over which of the following length scales is the continuum hypothesis invalid for air at standard temperature and pressure (STP)? I. inches II. 0.1 nanometers III. 10 nanometers IV. 1 micron
Choices:
I and IV only
I only
I, III, and IV only
I, II, III, and IV
Question: Which of the following are required in order to use Bernoulli's equation? I. Steady flow II. Flow along a streamline III. Inviscid flow IV. Incompressible flow
Choices:
I, II, III, and IV
I and II only
I, II, and III only
II and III only
III and IV only
Question: Which of the following best describes the continuum hypothesis for a fluid?
Choices:
A fluid deforms continuously.
Fluid properties do not undergo a jump at a boundary.
Pressure changes as a continuous function in space.
The properties of a small averaging volume are the same as those for a macroscopic fluid.
Question: Which of the following situations might be much better described by compressible flow than incompressible flow?
Choices:
Water flow over Niagra Falls
Air flow over a supersonic plane
Oil flow through a lubrication layer
Air flow in your lungs
Question: Which of the following expresses Reynolds' transport theorem?
Choices:
The volume integral of the derivative of a scalar or vector field over a timedependent volume is equal to the volume integral of the velocity of the field plus the surface integral of the product of the outward boundary speed and the field.
The derivative of the volume integral of a scalar or vector field over a timedependent volume is equal to the volume integral of the derivative of the field plus the surface integral of the product of the outward boundary speed and the field.
The derivative of the volume integral of a scalar or vector field over a timedependent volume is equal to the volume integral of the derivative of the divergence of the field plus the surface integral of the product of the outward boundary speed and the field.
The derivative of the volume integral of a scalar or vector field over a timedependent volume is equal to the volume integral of the derivative of the field plus the volume integral of the product of the outward boundary speed and the field.
Question: How high can a 5 hP pump move 5 gal/min of water in Earth's gravity if there are no frictional losses?
Choices:
1.2 m
12 m
120 m
1200 m
Question: Which of the following statements accurately describes Eulerian and Lagrangian mechanics or reference frames?
Choices:
A neutrally buoyant weather balloon makes pressure measurements in an Eulerian reference frame.
An anemometer at the top of Mount Washington makes wind velocity measurements in an Eulerian reference frame.
The fixed laboratory reference frame is a Lagrangian reference frame.
Neither Lagrangian nor Eulerian viewpoints can be exactly correct.
Question: For ideal (no frictional losses) flow of an incompressible fluid through a sudden expansion, which of the following best describes how the Bernoulli equation predicts that the pressure will change?
Choices:
The pressure will be lower after the expansion than before.
The pressure will be the same before and after the expansion.
The pressure will be larger after the expansion than before.
The flow will stagnate after the expansion.
Question: Ice has a density of 0.91667 g/cm[sup]3[/sup]. Seawater has a surface density of about 1.03 g/cm[sup]3[/sup]. Which of the following best represents the fraction of an iceberg that appears above the water surface according to this data?
Choices:
9%
14%
18%
11%
33%
Question: Which of the following best characterizes a "fluid"?
Choices:
A fluid flows under the influence of a pressure gradient.
A fluid deforms in response to stress.
A fluid has viscosity.
A fluid ceases to flow if there is no pressure gradient.