Which of the following statements about airlift pumps are correct?
Statement 1: In airlift pumps, the air is introduced above a liquid in pressure level and that pressure is used to discharge the liquid.
Statement 2: Airlift pumps are used to convey powders in fluidized form.
a) True, False
b) True, True
c) False, True
d) False, False

Answer: b
Explanation: In airlift pumps, the air is introduced above a liquid in pressure level and that pressure is used to discharge the liquid. In case of powders, air is blown up through a bed of powder to convey it in the fluidized form. They are convenient for the materials which cannot be passed easily through valves and ports.