NIFE ENGINES UPDATED ACTUAL Questions and CORRECT Answers
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Course
NIFE ENGINES
Institution
NIFE ENGINES
NIFE ENGINES UPDATED ACTUAL
Questions and CORRECT Answers
static pressure - CORRECT ANSWER- the potential energy of fluid molecules at rest
(often just referred to as pressure)
dynamic pressure - CORRECT ANSWER- the kinetic energy of fluid molecules in
motion (often referred to as velocity)...
NIFE ENGINES UPDATED ACTUAL
Questions and CORRECT Answers
static pressure - CORRECT ANSWER✔✔- the potential energy of fluid molecules at rest
(often just referred to as pressure)
dynamic pressure - CORRECT ANSWER✔✔- the kinetic energy of fluid molecules in
motion (often referred to as velocity)
total pressure - CORRECT ANSWER✔✔- sum of static and dynamic pressure
nozzle - CORRECT ANSWER✔✔- increases the airflow's velocity and decreases the
airflow's pressure
Bernoulli's Theorem - CORRECT ANSWER✔✔- as any incompressible fluid (subsonic
airflow) passes through a convergent opening its velocity increases and pressure decreases
Brayton cycle - CORRECT ANSWER✔✔- consists of four events occurring simultaneously;
intake, compression, combustion, and exhaust; used by gas turbine engines
Otto cycle - CORRECT ANSWER✔✔- consists of four events occurring sequentially: intake
then compression, then combustion, then exhaust (piston system); used by reciprocating
engines
gas generator - CORRECT ANSWER✔✔- produces the high-energy airflow necessary for
creating thrust
gas turbine engine minimum components - CORRECT ANSWER✔✔- compressor,
combustion chamber, and a turbine
,thrust - CORRECT ANSWER✔✔- result of many pressure, temperature, and velocity
changes as airflow passes through engine
thrust equation - CORRECT ANSWER✔✔- T = m * a
gross thrust - CORRECT ANSWER✔✔- a measurement of thrust due solely from the
velocity of the exhaust gases; Stationary, standard day, exhaust gas velocity only
net thrust - CORRECT ANSWER✔✔- thrust that corrects for the effect of inlet airflow
velocity; often times just called thrust
net thrust equation - CORRECT ANSWER✔✔- Net thrust=m* ((Vfinal-Vinitial)/t)
density - CORRECT ANSWER✔✔- the mass of a substance per unit of its volume
factors that affect thrust (TAPER) - CORRECT ANSWER✔✔- Temperature, Altitude,
Pressure, Engine RPM, Ram effect (see figure for how they affect)
ram effect - CORRECT ANSWER✔✔- increased air "ramming" into inlet at increased speeds
increasing the mass and pressure of inlet air; will increase thrust, and does more at supersonic
than subsonic
Engine Pressure Ratio (EPR) gauge - CORRECT ANSWER✔✔- indicates the pressure ratio
between the inlet and exhaust airflow; Used on turbojet and turbofan aircraft
torquemeter - CORRECT ANSWER✔✔- indicates shaft horsepower available to drive a
propeller or rotor; Used on propeller or rotor driven aircraft
tachometer - CORRECT ANSWER✔✔- indicates engine speed/amount of energy produced
by engine; measured in RPM
inlet ducts - CORRECT ANSWER✔✔- provides the proper amount of high pressure,
turbulence-free air to the compressor (feeds the compressor); shape will always be a diffuser
supersonic inlet shape - CORRECT ANSWER✔✔- initially converges until air is subsonic
then divergent (convergent-divergent)
variable geometry inlet duct - CORRECT ANSWER✔✔- utilizes mechanical devices such as
ramps, wedges, or cones to change the shape of the inlet duct as the aircraft speed varies
between subsonic and supersonic; Divergent at subsonic, convergent at supersonic
compressor - CORRECT ANSWER✔✔- Increases the pressure of the airflow and supply
enough air to satisfy the requirements of the combustion section
centrifugal flow compressor - CORRECT ANSWER✔✔- Consists of an impeller (rotor
inducer), diffuser, and a manifold; highest pressure increase per stage; impractical for
multiple stages and creates drag
axial-flow compressor - CORRECT ANSWER✔✔- applies a straight line flow of the air
passing through the compressor; Consists of rotor blades and stator vanes; highest overall
compression
spool - CORRECT ANSWER✔✔- an assembly of stages
axial-centrifugal flow compressor - CORRECT ANSWER✔✔- utilizes the combination of
the axial and centrifugal flow compressor; starts as axial flow, terminates as centrifugal; small
but powerful; not suitable for supersonic speeds
inlet guide vanes - CORRECT ANSWER✔✔- Directs airflow to the first stage rotor; impart a
swirling motion to the air entering the compressor in the direction of engine rotation
exit guide vanes - CORRECT ANSWER✔✔- straighten the airflow to reduce the airflow
turbulence as it comes out of the rotational movement of the compressor
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