According to Newton's theory, what happens to the lift to drag value with decreasing angle of attack of a flat plate?

Correct Answer : Option (B) :   False

Explanation : For three – dimensional bodies such as a cone, Newtonian theory is generally more accurate in contrast with two – dimensional bodies like wedge. One more important property to note is that Newton’s theory gets much more accurate with increasing Mach number.

Correct Answer : Option (D) :   Oblique shock method

Explanation : There are three other local surface inclination inclinations, in addition to Newtonian theory. Methods that are widely used to estimate distributions of pressure over hypersonic bodies are the tangent wedge method, tangent cone method and shock – expansion method.

Correct Answer : Option (D) :   Pitching moment coefficient

Explanation : Chemically reactive flow in hypersonic flow determines the pitching moment over the space shuttle. The pressure on the forward part of the shuttle body is usually higher for a chemically reactive gas, and it is lower in the rearward part. This leads to a positive pitching moment of the shuttle.