Question

Question 1 Drag force is parallel and in the same direction of the free stream velocity. 

True

 False 

Question 6 In a fully developed flow, the flow profile remains unchanged in the streamwise direction. 

 True

Question 13 Piezometric pressure will be constant along a line that is normal to straight and parallel streamlines, 

True

 False 

Answer 1

Q1.) TRUE, Drag force is Parallel and in same direction of the free stream velocity.

There will be pressure difference between the front and back that leads to an additional force called as DRAG.

Q6.) TRUE, In fully developed flow, the flow profile remains unchanged in the streamwise direction.

Hence each fluid particle is moving with constant axial velocity in the streamline and velocity profile remains unchanged in flow direction. Therefore there is no motion of velocity in radial direction i.e., perpendicular to axis of pipe everywhere is zero.

Q13.)TRUE, Piezometric pressure will be constant along a line that is normal to striaght and parallel stream lines.

imal norm. Direction n 5 Stream lines

Therefore in normal direction Piezometric pressure is constant and acceleration is zero.