मुशेल वक्र (Muschel curves) निम्नलिखित में से किस श्रेणी के अंतर्गत आते हैं?

Two reservoirs at different levels are connected by two parallel pipes of lengths L and diameters 2d and d respectively. Assuming the friction factor is the same for both pipes, the ratio of the discharge in the two pipes (larger : smaller) is:

For a two-dimensional flow, the stream function is given by ψ = 3x2 - y3. The magnitude of velocity at the point (2, 1) is: