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Aerospace & Aeronautical MCQs

Q:

Which of the following flow is best suited for space shuttle?

A) continuum flow B) free molecular flow
C) turbulent flow D) laminar flow
 
Answer & Explanation Answer: B) free molecular flow

Explanation: In free molecular flow, the gas molecules are spaced so far apart that collisions with the body surface occur only infrequently and the body surface can feel distinctly each molecular impact which reduces the vibration in the space vehicle.

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86
Q:

Which of the following is a point property?

A) Pressure B) Mass
C) Density D) Pressure and density
 
Answer & Explanation Answer: D) Pressure and density

Explanation: Both pressure and density vary from one point to another. Pressure and density vary with the altitude and are directly proportional to each other. Pressure and density does depend on a path as they change from one point to other. If one parameter is changed, it affects pressure and density.

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73
Q:

Which of the following has similar characteristics?

A) solid and liquid B) liquid and gas
C) solid and gas D) cannot be determined
 
Answer & Explanation Answer: B) liquid and gas

Explanation: When force is applied to liquid and gas, there will be an increasing deformation, proportional to the rate of change of deformation. Also, the molecules in liquid and gas are loosely packed. When filled in a container, they take the shape of that container.

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115
Q:

By the time the vehicle reaches the surface of the earth, the potential and kinetic energy become zero.

A) True B) False
 
Answer & Explanation Answer: A) True

Explanation: During re-entry, near the outer edge of the atmosphere, the vehicle has a large amount of kinetic energy due to its high velocity and a large amount of potential energy due to its altitude but as it reaches the surface of earth it becomes zero because the kinetic and potential energy is utilized in heating the body and heating the airflow around the body.

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96
Q:

Which of the following is most difficult to analyze?

A) solid B) plasma
C) fluids D) cannot be determined
 
Answer & Explanation Answer: C) fluids

Explanation: Because fluid (liquid and gas) is a “squishy” substance. While the solid body is geometrically well defined and hence its motion can be defined easily. Whereas, in fluids, it is difficult to decide the qualitatively model the motion of the fluid.

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