List of top Aerodynamics Questions on Compressible Flows asked in GATE AE

A Mach \(1.5\) air flow enters a round duct of length \(20\) cm and diameter \(3\) cm. If the flow exits with Mach number \(1.1\), the average Fanning friction factor \(f\) of the duct is _______ \(\times 10^{-3}\) (rounded off to 1 decimal place).
An excerpt from the Fanno flow table for air is given below.
1.11.21.31.41.51.6
99.35336.4648.3997.413611724
Consider a centered Prandtl-Meyer expansion fan at a \(\theta = 4^{\circ}\) corner in a Mach \(1.78\) air flow, as shown in the figure below.
The angle \(\psi\) (see figure) made by the ending wave of the fan with respect to the incoming stream is _______ degrees (rounded off to 1 decimal place).
An excerpt from the table of Prandtl-Meyer function for air is provided below.
M\(\nu\) [deg]
1.7218.40
1.7418.98
1.7619.56
1.7820.15
1.8020.73
1.8221.30
1.8421.88
1.8622.45
1.8823.02
1.9023.59
1.9224.15
1.9424.71
1.9625.27
1.9825.83
2.0026.38
A flow is steady, inviscid and one-dimensional, with no shaft work or body forces. Which of the following is/are possible under the given conditions?
Which of the following statements is/are TRUE regarding critical and drag divergence Mach numbers of a wing?