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19-09-2021 Rocket Propulsion

Q. Which of the following statements is correct for an ideal rocket?

A. All kinds of frictional effects are not present, but the boundary layer cannot be neglected
B. All discontinuities are not present, but shock waves are allowable
C. Propellant flow is steady but constant
D. The expansion of the working fluid is steady, but need not be uniform

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Dapzoi Verified
Commented on 2021-09-19 16:06:34 (IST)
Answer: C

Explanation: In an ideal rocket, propellant flow is considered to be steady and constant. In such a vehicle, all kinds of frictional effects and boundary layers are neglected along with the possible discontinuities in flow such as shock waves. The expansion of the working fluid is both steady as well as uniform.