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NIFE ENGINES QUESTIONS WITH 100% CORRECT ANSWERS 2024 EXAM

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NIFE ENGINES QUESTIONS WITH 100% CORRECT ANSWERS 2024 EXAM What is Bernoulli's theorem RIGHT ANS>>- Any incompressible fluid that passes through a convergent opening, velocity increase, pressure decreases What is Bernoulli's Equation RIGHT ANS>>- Pt=Ps+Pk Which type of air is compr...

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NIFE ENGINES QUESTIONS WITH 100% CORRECT
ANSWERS 2024 EXAM

What is Bernoulli's theorem RIGHT ANS>>- Any incompressible fluid that passes through a convergent

opening, velocity increase, pressure decreases




What is Bernoulli's Equation RIGHT ANS>>- Pt=Ps+Pk




Which type of air is compressible? RIGHT ANS>>- Supersonic air




What happens to Velocity and Pressure in a nozzle RIGHT ANS>>- Pressure decreases, velocity

increases




What happens to Velocity and Pressure in a diffuser? RIGHT ANS>>- Pressure increases, velocity

decreases




Draw the tootsie roll method RIGHT ANS>>- Left side are diffusers, right side are nozzles




What does an increase in pressure at the inlet do for the engine? RIGHT ANS>>- It packs more oxygen

tighter together so the engine runs more efficiently

,What is the shape of the inlet? RIGHT ANS>>- Convergent-divergent




What is the shape of an incompressible air diffuser? RIGHT ANS>>- Divergent




What are the events/components of the Otto and the Brayton Cycle? RIGHT ANS>>- Intake,

Compression,Combustion, Exhaust




Explain what happens at each of the events in the Otto cycle RIGHT ANS>>- Intake: Air is entering the

valvewhile the piston is at the bottom


Compression: The pressure is increased as the piston moves up

Combustion: Spark ignites the air and sends the piston down

Exhaust: the valve opens to release the air and start the cycle over

What is the difference between the Otto and Brayton cycle? RIGHT ANS>>- All events happen

simultaneously in the Brayton cycle, while they happen in order in the Otto cycle




What three parts does a gas turbine engine have at a minimum? What else can also be included?

RIGHT ANS>>- Compressor, Combustion Chamber/Burner, Turbine




Inlet, Compressor, Diffuser, Combustion chamber/burner, Turbine, exhaust

,(I cant do complex turbine equations)




What is gross thrust? RIGHT ANS>>- Thrust solely from the velocity of the exhaust gases (ignores inlet)

atstandard day conditions (29.92 in/Hg and 15C)




What is net thrust and its equation? RIGHT ANS>>- Thrust that corrects for the inlet air.




Net Thrust=m*(Vf-Vi)/t




What is the thrust equation? RIGHT ANS>>- T=m*a




Explain the RAM effect in a gas turbine engine RIGHT ANS>>- As the aircraft goes faster, more and

more airis being rammed into the inlet. This increases the mass and pressure of the inlet air causing

better engine performance.




What are the cockpit thrust measuring devices? RIGHT ANS>>- EPR (Engine Pressure Ratio) gauge,

Torquemeter, and Tachometer




What is a EPR? RIGHT ANS>>- Engine pressure ratio. It measures the pressure ratio between the inlet

andexhaust airflow

, What is a torquemeter and what type of aircraft use it? RIGHT ANS>>- Indicated shaft horsepower

available to drive the rotor or prop. Aircrafts that have rotors or props.




What is a Tachometer? What is it measured in? RIGHT ANS>>- Gauge used to measure engine

performance/ speed. Measured in percent RPM




What is the purpose of an inlet duct? What is it designed to act like (nozzle or diffuser)? RIGHT

ANS>>- Provides the proper amount of high pressure, turbulence free air that is steady and uniform

to thefirst stage of the compressor. Diffuser.




What shape is the inlet of a subsonic aircraft? RIGHT ANS>>- Diverging shape




What shape is the inlet of a supersonic aircraft? RIGHT ANS>>- Converging-diverging




What is a variable geometry inlet duct and how does it work? RIGHT ANS>>- An inlet duct that uses

mechanical devices such as ramps, wedges, or cones that change the shape of the inlet duct as speed

goes between subsonic and supersonic.




What is the purpose of a compressor? RIGHT ANS>>- To supply enough air to satisfy the

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