Question

For maximum thrust in a rocket nozzle, the exit pressure should be

• A. Equal to chamber pressure
• B. Equal to ambient pressure
• C. Greater than ambient pressure
• D. Zero

Answer 1

The Correct Option is B

Step 1: Recall the condition for optimum nozzle expansion. Maximum thrust is obtained when the nozzle is perfectly expanded. For perfect expansion, \[ \boxed{ P_e=P_a, } \] where
• \(P_e\) = exit pressure,
• \(P_a\) = ambient pressure.

Step 2: Identify the correct option. If \[ P_e=P_a, \] there are no expansion or compression losses at the nozzle exit. Therefore, \[ \boxed{\text{Equal to ambient pressure}} \] is the correct answer. Thus, \[ \boxed{(B)} \] is the correct answer.