Pipe Flow

I suggest you to go through your text books or apply simple CS for such questions. Howevere I reply as follows:

1. Q1 = Q2, as same quantity of air per unit time passes through both the points.

2. P1 > P2, as downstream pressure will always be lower than upstream in pipe flow.

If Q = 0, then P1 = P2

I suggest to have a look at what Bernoulli wrote, with other words the sum of energies (potential + kinetic) is a constant if losses are neglected and fluid incompressible.

Here Bernoulli's law will not be applicable, because air is compressible.

HOMEWORK PROBLEM...! ! !