Propulsion efficiency of a jet engine is given by(where u is flight velocity and V is jet velocity relative to aircraft):

\[\left( \text{V}\,\,-\,\,\text{u} \right)\text{/2}\,\text{u}\]

\[\text{2}\,\text{u/}\left( \text{V}\,\,-\,\,\text{u} \right)\]

\[\left( \text{V}\,\,\text{+}\,\,\text{u} \right)\text{/2}\,\text{u}\]

\[\text{2}\,\text{u/}\left( \text{V}\,\,\text{+}\,\,\text{u} \right)\]

Propulsion efficiency of a jet engine is given by(where u is flight ve

1.	Propulsion efficiency of a jet engine is given by(where u is flight velocity and V is jet velocity relative to aircraft):
A.	\[\text{2}\,\text{u/}\left( \text{V}\,\,-\,\,\text{u} \right)\]
B.	\[\left( \text{V}\,\,\text{+}\,\,\text{u} \right)\text{/2}\,\text{u}\]
C.	\[\text{2}\,\text{u/}\left( \text{V}\,\,\text{+}\,\,\text{u} \right)\]
D.	\[\left( \text{V}\,\,-\,\,\text{u} \right)\text{/2}\,\text{u}\]
Answer» D. \[\left( \text{V}\,\,-\,\,\text{u} \right)\text{/2}\,\text{u}\]

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Propulsion efficiency of a jet engine is given by(where u is flight velocity and V is jet velocity relative to aircraft):

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