NIFE ENGINES EXAM QUESTIONS AND
CORRECT ANSWERS LATEST 2025-2026 UPDATE
|GRADE A+ GUARANTEE
thrust - Answer-result of many pressure, temperature, and velocity
changes as airflow passes through engine
thrust equation - Answer-T = m * a
gross thrust - Answer-a measurement of thrust due solely from the
velocity of the exhaust gases; Stationary, standard day, exhaust gas
velocity only
net thrust - Answer-thrust that corrects for the effect of inlet airflow
velocity; often times just called thrust
net thrust equation - Answer-Net thrust=m* ((Vfinal-Vinitial)/t)
static pressure - Answer-the potential energy of fluid molecules at rest
(often just referred to as pressure)
,dynamic pressure - Answer-the kinetic energy of fluid molecules in
motion (often referred to as velocity)
total pressure - Answer-sum of static and dynamic pressure
nozzle - Answer-increases the airflow's velocity and decreases the
airflow's pressure
diffuser - Answer-increases airflow's pressure and decreases airflow's
velocity
Bernoulli's Theorem - Answer-as any incompressible fluid (subsonic
airflow) passes through a convergent opening its velocity increases and
pressure decreases
Brayton cycle - Answer-consists of four events occurring
simultaneously; intake, compression, combustion, and exhaust; used by
gas turbine engines
Otto cycle - Answer-consists of four events occurring sequentially:
intake then compression, then combustion, then exhaust (piston system);
used by reciprocating engines
gas generator - Answer-produces the high-energy airflow necessary for
creating thrust
, gas turbine engine minimum components - Answer-compressor,
combustion chamber, and a turbine
density - Answer-the mass of a substance per unit of its volume
factors that affect thrust (TAPER) - Answer-Temperature, Altitude,
Pressure, Engine RPM, Ram effect (see figure for how they affect)
ram effect - 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 - Answer-indicates the pressure
ratio between the inlet and exhaust airflow; Used on turbojet and
turbofan aircraft
torquemeter - Answer-indicates shaft horsepower available to drive a
propeller or rotor; Used on propeller or rotor driven aircraft
tachometer - Answer-indicates engine speed/amount of energy
produced by engine; measured in RPM
inlet ducts - Answer-provides the proper amount of high pressure,
turbulence-free air to the compressor (feeds the compressor); shape will
always be a diffuser
CORRECT ANSWERS LATEST 2025-2026 UPDATE
|GRADE A+ GUARANTEE
thrust - Answer-result of many pressure, temperature, and velocity
changes as airflow passes through engine
thrust equation - Answer-T = m * a
gross thrust - Answer-a measurement of thrust due solely from the
velocity of the exhaust gases; Stationary, standard day, exhaust gas
velocity only
net thrust - Answer-thrust that corrects for the effect of inlet airflow
velocity; often times just called thrust
net thrust equation - Answer-Net thrust=m* ((Vfinal-Vinitial)/t)
static pressure - Answer-the potential energy of fluid molecules at rest
(often just referred to as pressure)
,dynamic pressure - Answer-the kinetic energy of fluid molecules in
motion (often referred to as velocity)
total pressure - Answer-sum of static and dynamic pressure
nozzle - Answer-increases the airflow's velocity and decreases the
airflow's pressure
diffuser - Answer-increases airflow's pressure and decreases airflow's
velocity
Bernoulli's Theorem - Answer-as any incompressible fluid (subsonic
airflow) passes through a convergent opening its velocity increases and
pressure decreases
Brayton cycle - Answer-consists of four events occurring
simultaneously; intake, compression, combustion, and exhaust; used by
gas turbine engines
Otto cycle - Answer-consists of four events occurring sequentially:
intake then compression, then combustion, then exhaust (piston system);
used by reciprocating engines
gas generator - Answer-produces the high-energy airflow necessary for
creating thrust
, gas turbine engine minimum components - Answer-compressor,
combustion chamber, and a turbine
density - Answer-the mass of a substance per unit of its volume
factors that affect thrust (TAPER) - Answer-Temperature, Altitude,
Pressure, Engine RPM, Ram effect (see figure for how they affect)
ram effect - 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 - Answer-indicates the pressure
ratio between the inlet and exhaust airflow; Used on turbojet and
turbofan aircraft
torquemeter - Answer-indicates shaft horsepower available to drive a
propeller or rotor; Used on propeller or rotor driven aircraft
tachometer - Answer-indicates engine speed/amount of energy
produced by engine; measured in RPM
inlet ducts - Answer-provides the proper amount of high pressure,
turbulence-free air to the compressor (feeds the compressor); shape will
always be a diffuser
