Question

If N_s1 is the specific speed of a pump handling larger discharges at low heads and N_s2 is that of a pump handling low discharges at high heads, then which one of the following is correct?  

a. N_s1 > N_s2

b. N_s1 < N_s2

c. N_s1 = N_s2

d. All the above three are possible under different situations