unit 1 Flashcards
An aircraft taxing at a steady speed can be used to demonstrate
Newton’s first law of motion
Newton’s third law of motion explains why an operating jet engine produces
forward thrust
Which type of duct would decrease the velocity and increase the pressure of a gas as it passes through?
Divergent
“The combination of decreased pressure about an airfoil, and the increased pressure below the airfoil produces life” is best described by
Bernoulli’s principle
Foot-pounds and inch0pounds are units of measure for
work
What does fuel for an engine represent?
Potential energy
Which section of a jet engine continually supplies air and maintains pressure?
Compressor
The temperature of compressed air in a jet engine must be raised to
increase energy
Which section of a jet engine introduces and burns fuel?
Combustion
How many British thermal units (Btu) does the heat content per pound of kerosene produce?
18,500
The efficiency of a jet engine is often referred to as
thermal efficiency
The product of thermal efficiency and propulsive efficiency is
overall efficiency
To measure barometric pressure, you would use a
Barometer
What effect does moisture content or humidity have on density of air?
More moisture, less dense
Due to the divergent design of a diffuser, air pressure
Increases
The air temperature of a jet engine gradually rises across the compressor to the diffuser outlet as a result of
compression
Where is the highest point of temperature reached in an engine
Combustion section
Which engine component meters fuel for combustion?
Fuel control
What happens to the energy that is absorbed by the turbine wheel?
It is returned to the compressor
What is the required velocity for air and gases flowing through a jet engine?
Greater velocity exiting than entering
The velocity of the stream of air that flows through a jet engine reaches it highest point at the
ejector nozzle
What is the general flow of gases from the combustion chamber?
Parallel to the axis of the rotor shaft
Gases enter the jet-engine’s first-stage turbine wheel blades from the
turbine stator
When two or more turbine wheels are used in a jet engine, which component is places directly in front of each turbine wheel?
Turbine stator (nozzle diaphragm)
