Exam (elaborations)
PROPULSION EXAM 3 QUESTIONS AND VERIFIED ANSWERS
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PROPULSION EXAM 3 QUESTIONS AND VERIFIED ANSWERS....
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A _______________ engine is a mechanical device which producesforward thrust by forcing the movement of a mass of gases rearward. -
ANSWER turbojet
The amount of force or thrust produced depends on the ___________ of
the air moved through the engine and the extent to which this air can be
_______________ and ejected. - ANSWER mass, accelerated
All engines but the _________________ require air from the
atmosphere to burn fuel. - ANSWER rockets
Once the fuel in burned in a jet engine, some or all of the heat produced
is used to operate __________________, which turn compressors, fans,
propellers, or shafts. - ANSWER the turbine
The ___________________ is the simplest of the jet engines in that it
contains no moving parts. - ANSWER ram jet engine
The pulse jet engine is different from the ram jet engine in that it has a
grill of _____________________________located at the inlet of the
engine. - ANSWER shutters
A gas-turbine engine has four major sections - ANSWER a compressor
section
a combustion section
a turbine section
a nozzle section
Gas turbine engines produce work _______________________ the
amount of heat released internally. - ANSWER in proportion to
,The more heat released, the ____________________ work is done. -
ANSWER more
The higher the temperature of combustion, the ________________ the
expansion of gases. - ANSWER greater
Aircraft turbine engines can generally be classified into four types -
ANSWER turbojet
turboshaft
turboprop
turbofan.
A turbojet engine is a type of gas-turbine engine which produces thrust
through the ejection of _____________________ from the exhaust
section of the engine. - ANSWER hot gases
The ________________________ engine accelerates a smaller volume
of air than the turboprop engine but a larger volume than the turbojet
engine. - ANSWER turbofan
Turbofan engines may be _______________-bypass or ___________-
bypass engines. - ANSWER high, low
A ______________-bypass engine does not bypass as much air around
the core as a ______________-bypass engine. - ANSWER low, high
The fan diameter of a turbofan is much ________________ than a
propeller, but there are ___________________ blades and it has a
greater ________________________. - ANSWER smaller, many
more, exhaust velocity
On some front-fan engines, the bypass airstream is ducted overboard
either directly behind the fan through short ducts or at the rear of the
engine through longer ducts, thus the term
___________________________. - ANSWER ducted fan
, The advantages of turbofans - ANSWER greater fuel efficiency
reduced noise
turbojet speeds
turboprop short field take off capability
A ____________________ engine is nothing more than a gas-turbine or
turbojet engine with a reduction gearbox mounted in the front or forward
end to drive a standard airplane propeller. - ANSWER turboprop
Both the propeller and the engine accelerate air in a
___________________ engine. - ANSWER turboprop
The major disadvantage of the turboprop is that it does not deliver
_______________
_________________________________________________________
___. - ANSWER as much power as a turbojet
A ____________________________engine is a gas-turbine engine
which delivers shaft horsepower through an output shaft. It is used
mainly on helicopters. - ANSWER turboshaft
The path of the air through a gas-turbine engine varies according to
_______________________ of the engine. - ANSWER design
When it is necessary to increase pressure and decrease velocity of air in
an engine, _________________________ducts are used. - ANSWER
divergent
When it is necessary to increase velocity and decrease pressure of air in
an engine, a ___________________________ duct is used. -
ANSWER convergent
Once combustion occurs, pressure is no longer the driving requirement.
It is ________________________. - ANSWER exit velocity
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