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26 Cards in this Set
- Front
- Back
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When the opening of a filled ball on is closed, why is there no action on the ballon. |
Pressure of the gas inside the ballon is exerted equally in all direction |
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What type of energy does a falling object posses |
Kinetic energy |
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Can energy pass from potential to kinetic and back to potential |
Yes |
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What is newton's first law of motion |
A body at rest remains at rest and a body in motion continues to move at a constant speed in a straight line |
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What is newton's second law of motion |
A unbalanced force on a body produces, or lends to produce, an acceleration in the direction of the force |
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Which law of physics best explains how a jet engine produce forward thrust |
Newton's third law of motion |
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State Bernoulli's principle |
As the velocity of a gas increase, there will be corresponding decrease in pressure and when the velocity of the gas decrease,the pressure increase |
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When a jet engine reaches idle speed, what determines how the fuel control regulates engine speed |
The power lever setting and the fuel control meters |
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What two forms of energy does a jet engine produce |
Energy used for thrust and energy lost to the atmosphere in the form of heat |
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Approximately what percent of the energy produce by the fuel is needed to maintain the jet engine operating cycle |
60% |
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Where is the point of heightest pressure within a jet engine |
The diffuser due to its divergent design |
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On a jet engine that does not have an afterburner, where is the point of highest temperature |
In the combustion |
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Where is the point of highest airflow velocity in a jet engine |
Point at the ejector nozzle |
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What is the purpose of the turbine stator |
The velocity of the gases that strike the turbine blades by means of airfoil-shaped vanes |
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After the gases leave the turbine section and enter the exhaust section, what type of velocity |
Their axial velocity |
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What straightens the flowpath of gases in the exhaust case |
Vanes in the exhaust case straighten the path of gases |
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In a multistage turbine, what is the arrangement of the shafts |
One shaft is hollow, permitting the other shaft to operate inside it |
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Which turbine drives the front compressor on a dual spool engine |
Rear turbine |
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What is a turojet engine |
Air-dependent, thermal, jet propulsion device thermal, jet propulsion device thermal, jet propulsion device |
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Name the three main section of a gas turbine engine |
Compressor combustion chamber turbine |
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What are the two types of compressors used in jet engines |
Centrifugal and axial-flow |
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How do pressure pulsations in a centrifugal compressor present themselves |
Shock waves or irregular movements of air through the compressor |
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What effect do pressure pulsations have on a compressor |
There is rapid reduction in the compressor's efficiency |
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Why is it not desirable to use multiple-stage centrifugal compressor to increase the pressure ratio |
Further complicate the construction and weight of the engine |
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What two needs stimulated the development of the axial-flow compressors |
More powerful and more economical engine |
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How does axial flow compressor rotor blades similar to an aircraft propeller |
Airfoil shaped blades which, when rotated, catch the air and push it from the leading edge of the blades to the rear or trailing edge of the blades |
