Answer Happy

Questions: 1. [10 points] Read the following statements carefully and indicate True or False in your examination booklet: a) The static pressure is the pressure measured by a sensor moving at the same velocity as the fluid velocity. b) In a large, pressurized air tank, the stagnation pressure is larger than the static pressure at the same point. c) The flow across a normal shock wave is isentropic. d) e) Density p is constant across the expansion wave since it is an isentropic process. For a wedge of given deflection angle, wave angle of an attached oblique shock decreases as the Mach number decreases. f) A thinner airfoil will generally have a higher critical Mach number Mer compared to a thicker airfoil. g) Area ruling is a process in which the wing area of the airplane is changed to reduce supersonic drag. h) Supercritical airfoils achieve better performance by increasing Mer. i) An optimal shape for a re-entry vehicle moving at hypersonic Mach numbers is a sharp conical shape. j) Convective heating becomes less important than radiative heating as re-entry velocity increases.