It is desired to operate a pump at 1750 rpm by driving it with a four-pole electric motor. For each of the following conditions, compute the specific speed using Eq. (13–17). Then, recommend whether to use an axial pump, a mixed-flow pump, a radial-flow pump, or none of these, based on the discussion related to Fig. 13.53.

a. 500 gal/min of water at 80 ft of total head

b. 500 gal/min of water at 800 ft of head

c. 3500 gal/min of water at 80 ft of head

d. 80 gal/min of water at 8000 ft of head

e. 80 gal/min of water at 800 ft of head

f. 8000 gal/min of water at 200 ft of head

g. 8000 gal/min of water at 60 ft of head

h. 8000 gal/min of water at 12 ft of head