NIFE Engines Exam Questions and
Verified Detailed Answers | Graded A+
the potential of fluid molecules at rest. within a gas generator is simply called
pressure - ✔✔static pressure
the kinetic energy of fluid molecules in motion. within a gas generator is simply
called velocity - ✔✔dynamic pressure
sum of pressure (static pressure) and velocity (dynamic pressure) - ✔✔Total
Pressure
air is considered to be a _______________ _________________ -
✔✔compressible fluid
Airflow is considered to be relatively __________________
__________________ at subsonic speeds - ✔✔incompressible fluid
Bernoulli states that any incompressible fluid passing through a convergent
opening causes the velocity to _______________ and the pressure to
_________________________. - ✔✔increase, decrease
Bernoulli also states any ________________ in velocity will cause a
________________ in pressure, and vice versa. - ✔✔increase, decrease
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©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
,Bernoulli's also states, "as a subsonic (incompressible) fluid passes through a
divergent opening the velocity will ___________________ and the pressure will
_______________________ - ✔✔decrease, increase
as airflow approaches or reaches supersonic speeds, the airflow becomes more
______________ - ✔✔compressible
A convergent opening will cause supersonic (compressible) airflow velocity to
________________ and the pressure to __________________- - ✔✔decrease,
increase
A divergent opening causes supersonic (compressible) airflow velocity to
_________________ and the pressure to ____________________ - ✔✔increase,
decrease
nozzles always ______________ velocity and _________________ pressure -
✔✔increase, decrease
Supersonic or subsonic airflow determines the _______________ or
_________________ shape of the nozzles/diffusers - ✔✔convergent, divergent
diffusers always decrease ________________ velocity and
_____________________ pressure - ✔✔decrease, increase
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©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
,Gas generators use nozzles/diffusers within to increase subsonic airflow to
______________ speeds, decrease supersonic airflow to _______________
speeds - ✔✔supersonic, subsonic
________________ ______________ produces the high energy airflow needed
to create thrust in a gas turbine engine - ✔✔gas generator
all gas generators will minimally include... - ✔✔compressor, combustion
chamber, turbine
gas turbine engines have a cycle of operation known as the _____________
_____________. - ✔✔brayton cycle
brayton cycle consists of four events which occur simultaneously - ✔✔Intake,
Compression, Combustion, Exhaust
________________ engines have an operation known as the otto cycle. otto
cycle consists of four events which occur sequentially - ✔✔reciprocating
in a gas turbine engine, the _____________ is at the front opening of the engine,
increases _____________ and decrease _____________ - ✔✔inlet, pressure,
velocity
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©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
, in a gas turbine engine the _________________ comes right after the inlet to
increase velocity, temperature, pressure, total pressure (not ____________
system) - ✔✔compressor, closed
in a gas turbine engine, the ______________ is part of compressor and is used
to increase pressure, decrease velocity - ✔✔diffuser
in a gas turbine engine, the ______________ ________________ is where the
air/fuel is combusted, increase ______________ and ______________. slight
decrease in _______________ (gas turbine engine) - ✔✔combustion chamber,
temperature, velocity, pressure
in a gas turbine engine, the _________________ increases velocity, decrease
pressure. it use most kinetic energy to turn compressor - ✔✔turbine
in a gas turbine engine, the _________________ provides the final velocity
increase, pressure decrease - ✔✔exhaust
Thrust equation - ✔✔T = m x a
_______________ _____________ is measured on stationary engines or on
aircraft ground run-ups. based on standard day conditions (29.92, 15 degrees C).
ignores the velocity of air at the inlet and measures exhaust gas velocity only -
✔✔Gross thrust
Page 4 of 51
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
Verified Detailed Answers | Graded A+
the potential of fluid molecules at rest. within a gas generator is simply called
pressure - ✔✔static pressure
the kinetic energy of fluid molecules in motion. within a gas generator is simply
called velocity - ✔✔dynamic pressure
sum of pressure (static pressure) and velocity (dynamic pressure) - ✔✔Total
Pressure
air is considered to be a _______________ _________________ -
✔✔compressible fluid
Airflow is considered to be relatively __________________
__________________ at subsonic speeds - ✔✔incompressible fluid
Bernoulli states that any incompressible fluid passing through a convergent
opening causes the velocity to _______________ and the pressure to
_________________________. - ✔✔increase, decrease
Bernoulli also states any ________________ in velocity will cause a
________________ in pressure, and vice versa. - ✔✔increase, decrease
Page 1 of 51
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
,Bernoulli's also states, "as a subsonic (incompressible) fluid passes through a
divergent opening the velocity will ___________________ and the pressure will
_______________________ - ✔✔decrease, increase
as airflow approaches or reaches supersonic speeds, the airflow becomes more
______________ - ✔✔compressible
A convergent opening will cause supersonic (compressible) airflow velocity to
________________ and the pressure to __________________- - ✔✔decrease,
increase
A divergent opening causes supersonic (compressible) airflow velocity to
_________________ and the pressure to ____________________ - ✔✔increase,
decrease
nozzles always ______________ velocity and _________________ pressure -
✔✔increase, decrease
Supersonic or subsonic airflow determines the _______________ or
_________________ shape of the nozzles/diffusers - ✔✔convergent, divergent
diffusers always decrease ________________ velocity and
_____________________ pressure - ✔✔decrease, increase
Page 2 of 51
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
,Gas generators use nozzles/diffusers within to increase subsonic airflow to
______________ speeds, decrease supersonic airflow to _______________
speeds - ✔✔supersonic, subsonic
________________ ______________ produces the high energy airflow needed
to create thrust in a gas turbine engine - ✔✔gas generator
all gas generators will minimally include... - ✔✔compressor, combustion
chamber, turbine
gas turbine engines have a cycle of operation known as the _____________
_____________. - ✔✔brayton cycle
brayton cycle consists of four events which occur simultaneously - ✔✔Intake,
Compression, Combustion, Exhaust
________________ engines have an operation known as the otto cycle. otto
cycle consists of four events which occur sequentially - ✔✔reciprocating
in a gas turbine engine, the _____________ is at the front opening of the engine,
increases _____________ and decrease _____________ - ✔✔inlet, pressure,
velocity
Page 3 of 51
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
, in a gas turbine engine the _________________ comes right after the inlet to
increase velocity, temperature, pressure, total pressure (not ____________
system) - ✔✔compressor, closed
in a gas turbine engine, the ______________ is part of compressor and is used
to increase pressure, decrease velocity - ✔✔diffuser
in a gas turbine engine, the ______________ ________________ is where the
air/fuel is combusted, increase ______________ and ______________. slight
decrease in _______________ (gas turbine engine) - ✔✔combustion chamber,
temperature, velocity, pressure
in a gas turbine engine, the _________________ increases velocity, decrease
pressure. it use most kinetic energy to turn compressor - ✔✔turbine
in a gas turbine engine, the _________________ provides the final velocity
increase, pressure decrease - ✔✔exhaust
Thrust equation - ✔✔T = m x a
_______________ _____________ is measured on stationary engines or on
aircraft ground run-ups. based on standard day conditions (29.92, 15 degrees C).
ignores the velocity of air at the inlet and measures exhaust gas velocity only -
✔✔Gross thrust
Page 4 of 51
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
