An exhaust cone placed aft of the turbine in a jet engine will cause the pressure in the first part of the exhaust duct to
- increase and the velocity to decrease.
- decrease and the velocity to increase.
- increase and the velocity to increase.
Explanation
The exhaust cone makes the gas passage divergent in its first part, so the gas slows down and, by Bernoulli's principle, its pressure rises. Raising the static pressure ahead of the propelling nozzle helps the nozzle produce thrust efficiently.
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