TURBINE MIDTERM 2

Select a cause of a low air density condition from the following:
high temperature
low temperature
low humidity
low altitude
Which of the following best defines the term “power”?
a change in velocity with respect to time
the capacity to do work
force multiplied by distance
the time rate of doing work
What affect does a convergent duct have on static air pressure?
pressure will increase
pressure will decrease
it will not have an affect on static pressure; only dynamic pressure and thrust will change
who cares; I hate the Habs
Which of the following defines the relationship between pressure and volume in a jet engine ...
Bernoulli’s principle
Brayton cycle
Otto cycle
Uni cycle
Where is the highest static pressure zone in a gas turbine engine?
Inlet to the compressors
Diffuser section
Combustion chamber
Exhaust nozzle
Choose the correct statement from the following:
thrust increases as temperature decreases
thrust increases as temperature increases
thrust increases as density decreases
thrust is measured in pounds per square inch
Which of the following best describes an engine’s thermal efficiency?
ratio of kinetic energy to useful work produced by the engine
ratio of the work produced by the engine to the fuel energy input
it is a measure of the fuel consumption rate
ratio of exhaust gas temperature versus thrust
Identify the exhaust gas velocity to aircraft speed ratio that has the greatest propulsive efficiency
6:1
4:1
2:1
1:1
Identify an advantage of using a modular engine construction
there are fewer moving parts
it takes less time to remove the engine from the aircraft
reduced maintenance costs
who cares; I hate the Habs
Which type of duct design is used on a subsonic aircraft?
divergent
convergent
detergent
reverse flow
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