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Aero 315 Happy Studying Questions and Answers.
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Aero 315 Happy Studying Questions andAnswers.
Why can streamlines be treated as material boundaries when they form the walls of a
stream tube? Can't air just flow across the streamline since they are not really a material
surface? (5.1) - Correct answer Streamlines are defined as lines everywhere tangent to
the local velocity vector. So, even though a streamline is not material, air can't flow
across it
The continuity equation is a statement of which principle of physics? (5.2) - Correct
answer Conservation of mass
Which of the following assumptions is NOT necessary when using the continuity
equation? (5.5) - Correct answer No nuclear reactions
When utilizing the Continuity Equation (Compressible form), what assumptions must be
made? - Correct answer Steady, one-dimensional, area is perpendicular to the airflow
A stream tube is defined as _________________? (5.1) - Correct answer A collection of
streamlines
On a hot summer day, you are standing inside a cabin looking at a manometer that
compares the outside air and inside air pressures. The outside thermometer reads 95
dig F and the fluid in the manometer is water. The fluid level in the manometer inside
the cabin is 30 inches lower than it is outside the cabin. If the pressure altitude in the
cabin is 10,000 ft., what is the density of the air outside? (4.4) Hint: Use Manometer
Equation to find the pressure outside, then the perfect gas law to find the density. -
Correct answer 0.0014 slugs/ft3
The standard atmosphere was built using these three relations: - Correct answer
Perfect gas, hydrostatic equation, and an empirical temperature profile
According to Figure 2.4, at what altitude is the tropopause - Correct answer 11km
How does a standard altimeter work - Correct answer It is a simple pressure gauge
calibrated in units of altitude instead of pressure
An aircraft's instruments measure an air temperature of 15 degC and an air pressure of
83 kPa. What is the air density for these conditions? (Use Equation 2.1) - Correct
answer 1.0 kg/m^3
From Table B.1 in Appendix B, what is the atmospheric pressure on a standard day at
10,000 ft altitude? - Correct answer 1456 lb/ft^2
, A manometer is filled with water. On the first side, the pressure is standard sea level
pressure (P1 = 101325 kPa). The second side is open to the room. The fluid is 50cm
higher on the second side than the first side. What is the pressure in the room? Note:
The density of water is 1000kg/m^3. Use Equation 2.3 - Correct answer 96425 Pa
What would be considered by the USAF to be a valid reason for designing a new
aircraft? - Correct answer National Security requires that we have the newest aircraft in
the world
What correctly describes one of the influences World War I had on aviation? - Correct
answer The large number of trained pilots and inexpensive surplus military aircraft
available in the US after the war led to a vast expansion of aviation activities,
enterprises, and public awareness
If you were designing a helicopter to land on the top of Mount Everest, and you did
some research to find out what the atmospheric conditions were there, what step of the
Engineering Method would you be accomplishing? - Correct answer Collecting Info
What are the four fundamental flow properties that define the condition of a fluid? -
Correct answer Temperature, Density, Velocity, and Pressure
When a gas is Perfect, or Ideal, what properties can be related in an equation? - Correct
answer Density, temperature, and pressure
An aircraft's instruments measure an air temperature of 20 degrees C and an air
pressure of 95 kPa. What is the air density for these conditions? - Correct answer 1.13
kg/m3
The most important aspect of dimensionless parameters is their value in establishing -
Correct answer Similarity
What is the Mach number if your velocity is 800 ft/s and the local speed of sound is
1000 ft/s? Note: M=V/a - Correct answer 0.8
Bernoulli's Equation requires what five assumptions? (6.1) - Correct answer Body forces
can be ignored, steady, inviscid, incompressible and along a streamline
Which of the following statements is FALSE? (6.1) - Correct answer Bernoulli's equation
can be used at all subsonic speeds
Which statement describes the flow over an airfoil (refer to figure 3.9 in your book,
assume the flow is 1D at station 1)? (6.4) - Correct answer The Total Pressure will be
the same everywhere in the flowfield
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