NIFE ENGINES EXPLORE 55
ESSENTIAL QUESTIONS AND
ANSWERS
What are the four events of the Brayton Cycle? - Answer- Intake, compression,
combustion, and exhaust.
How do Brayton Cycle events occur? - Answer- Simultaneously.
What is the Otto Cycle? - Answer- The operating cycle of a reciprocating engine.
How do Otto Cycle events occur? - Answer- Sequentially.
What is thrust? - Answer- The force produced by accelerating a mass of air.
What is the thrust equation? - Answer- Thrust equals mass times acceleration.
What is gross thrust? - Answer- Thrust measured without accounting for inlet air
velocity.
Under what conditions is gross thrust measured? - Answer- Stationary or ground run-up
under standard day conditions.
What is net thrust? - Answer- Thrust corrected for inlet airflow velocity.
Why is net thrust more realistic? - Answer- It accounts for the aircraft's forward motion.
When are gross and net thrust equal? - Answer- When inlet velocity is zero under
standard day conditions.
What is air density? - Answer- Mass of air per unit volume.
How does air density affect thrust? - Answer- Higher density increases mass flow and
thrust.
What factors affect thrust in a gas turbine engine? - Answer- Temperature, altitude,
pressure, engine RPM, airspeed, and ram effect.
How does temperature affect thrust? - Answer- Lower temperature increases air density
and thrust.
ESSENTIAL QUESTIONS AND
ANSWERS
What are the four events of the Brayton Cycle? - Answer- Intake, compression,
combustion, and exhaust.
How do Brayton Cycle events occur? - Answer- Simultaneously.
What is the Otto Cycle? - Answer- The operating cycle of a reciprocating engine.
How do Otto Cycle events occur? - Answer- Sequentially.
What is thrust? - Answer- The force produced by accelerating a mass of air.
What is the thrust equation? - Answer- Thrust equals mass times acceleration.
What is gross thrust? - Answer- Thrust measured without accounting for inlet air
velocity.
Under what conditions is gross thrust measured? - Answer- Stationary or ground run-up
under standard day conditions.
What is net thrust? - Answer- Thrust corrected for inlet airflow velocity.
Why is net thrust more realistic? - Answer- It accounts for the aircraft's forward motion.
When are gross and net thrust equal? - Answer- When inlet velocity is zero under
standard day conditions.
What is air density? - Answer- Mass of air per unit volume.
How does air density affect thrust? - Answer- Higher density increases mass flow and
thrust.
What factors affect thrust in a gas turbine engine? - Answer- Temperature, altitude,
pressure, engine RPM, airspeed, and ram effect.
How does temperature affect thrust? - Answer- Lower temperature increases air density
and thrust.
