The critical Mach number of an airfoil is attained when2 pointsThe Mach number somewhere on the airfoil is unityThe freestream Mach number is sonicThe freestream Mach number is supersonicThe Mach number everywhere on the airfoil is supersonic

The Mach number is the ratio between:Group of answer choicesThe speed of the fluid and the speed of soundThe speed of a wave to the speed of soundThe speed of a vehicle to the speed of soundAll of the above

In a scramjet engine, the Mach number at the entry of the combustor is2 points00.362

An aerofoilQuestion 11Select one:a.Must have a cambered cross-sectionb.Must have a symmetrical cross-sectionc.Must be streamlinedd.Must have reflex camber

A supersonic aircraft has an air intake ramp that can be rotated about the leadingedge O such that the shock from the leading edge meets the cowl lip as shown inthe figure. Select all the correct statement(s) as per oblique shock theory when theflight Mach number M is increased.(A) It is always possible to find a ramp settingRAMP such that the shock still meetsthe cowl lip (SHOCK remains the same).(B) IfRAMP is held fixed, the shock angleSHOCK will increase.(C) If M exceeds a critical value, it would NOT be possible to find a ramp settingRAMPsuch that the shock still meets the cowl lip (SHOCK remains the same).(D) Shock angle1 1sinSHOCK M−     

We have 0 = f ′(t) = −18(2 sin(t) − 1)(sin(t) + 1) when 0 = 2 sin(t) − 1 or 0 = sin(t) + 1, which means that the only critical number in the interval 0, 𝜋2 is at t =