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Mechanical Engineering QUESTION #2405
Question 1
The Mach number \(Ma\) for a compressible flow with velocity \(V\) and speed of sound \(c=\sqrt{E/\rho}\) is:
  • \(Ma = V/c = V/\sqrt{E/\rho}\)✔️
  • \(Ma = c/V\)
  • \(Ma = V^2/(E/\rho)\)
  • \(Ma = E/(V\rho)\)
Correct Answer Explanation
Mach number: \(Ma=V/c\) where \(c=\sqrt{E/\rho}=\sqrt{\gamma RT}\) is the speed of sound. Flow regimes: subsonic (\(Ma<1\)), sonic (\(Ma=1\)), supersonic (\(Ma>1\)).