History Quiz: Date Reference Questions
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History Quiz: Date Reference Questions

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Questions and Answers

What is Newton's first law called?

  • The law of inertia (correct)
  • The law of acceleration
  • The law of action and reaction
  • If a mass of air is accelerated rearward, according to Newton's third law:

  • There will be rearward reaction
  • The magnitude of the force varies with the square of…
  • A forward reaction will result (correct)
  • By the third law, if the air is pushed by the compressor rearward, thrust is added to:

  • Forward (correct)
  • Rearward
  • When analyzing airflow through an axial compressor, velocity would be regarded as a:

    <p>Vector quantity</p> Signup and view all the answers

    Velocity and speed are often expressed in similar terms, but velocity is determined when:

    <p>Direction of an object's movement is detailed</p> Signup and view all the answers

    A spring has:

    <p>Potential energy</p> Signup and view all the answers

    Total pressure is:

    <p>Static + dynamic</p> Signup and view all the answers

    Total pressure at inlet air, the pressure is?

    <p>Increase ram air</p> Signup and view all the answers

    Total air pressure measured, static pressure:

    <p>Plus ram effect</p> Signup and view all the answers

    Airflow through a convergent duct will result in:

    <p>Pressure drop, velocity rise, temperature drop</p> Signup and view all the answers

    Diffuser of inlet:

    <p>Pressure rise, temperature rise, velocity drop</p> Signup and view all the answers

    Airflow through a divergent duct will result in:

    <p>Pressure rise, velocity drop, temperature rise</p> Signup and view all the answers

    What is the difference of the aerodynamics between the compressor and turbine area?

    <p>The air flows through a converging passage in the compressor area but the air flows through a diverging passage in the turbine area</p> Signup and view all the answers

    Air exiting from the exhaust duct of a choked nozzle, the pressure:

    <p>Above the ambient pressure</p> Signup and view all the answers

    If the pressure ratio of an engine is greater than 1.89, the exhaust nozzle speed:

    <p>Air velocity stabilizes and increases to Mach 1</p> Signup and view all the answers

    Nozzle choked:

    <p>Provide pressure thrust which is effective over the nozzle</p> Signup and view all the answers

    Study Notes

    Basic Physics Fundamentals

    • Newton's first law is known as the law of inertia, illustrating an object's resistance to changes in motion.
    • When a mass of air is accelerated rearward, a forward reaction (thrust) occurs according to Newton's third law.
    • Analyzing airflow in an axial compressor treats velocity as a vector quantity, which includes both magnitude and direction.
    • Velocity differs from speed by incorporating direction in its measurement, while speed is a scalar quantity.
    • A spring possesses potential energy, which is the stored energy due to its position.

    Basic Gas Dynamics Concepts

    • Total pressure in a fluid system is the sum of static pressure and dynamic pressure.
    • Inlet air total pressure experiences an increase in ram air, enhancing engine power due to increased static pressure and air density.
    • Total air pressure measured at static pressure adds the ram effect, impacting overall pressure readings.
    • When airflow passes through a convergent duct, it results in a pressure drop, velocity rise, and temperature drop, applicable only for subsonic airflow.
    • Diffuser inlets are characterized by a pressure rise, temperature rise, and velocity drop.
    • Airflow through a divergent duct leads to a pressure rise, temperature rise, and velocity drop for subsonic airflow.

    Aerodynamics and Engine Dynamics

    • The aerodynamics between compressors and turbines varies significantly: compressors have converging passages while turbines utilize diverging passages.
    • Air exiting from a choked nozzle experiences pressure above ambient conditions, attributable to increased upstream total pressure.
    • An exhaust nozzle speed exceeds Mach 1 if the pressure ratio of an engine surpasses 1.89, indicating significant air velocity changes.
    • A choked nozzle provides pressure thrust, enhancing overall thrust performance by utilizing excess pressure in the propelling nozzle.

    Key Thrust Dynamics

    • Choked nozzles add thrust by converting pressure energy into kinetic energy, resulting in increased velocity at the exit—critical for optimizing engine performance.

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    Description

    Test your knowledge on historical events and dates with this comprehensive quiz. Featuring questions categorized by year ranges from 2003 to 2016, it's designed to challenge your recall and understanding of history. Check your answers against the provided references for accuracy.

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