Question 2879 Deck General

The correct answer is C) Difference between the discharge and suction pressures. The term "head" when applied to a pump refers to the difference in pressure between the pump's discharge and suction sides. This pressure difference represents the amount of energy the pump imparts to the fluid, which is used to overcome resistance and lift the fluid to a higher elevation or discharge it against a higher pressure. The other options are incorrect because: A) The sum of discharge and suction pressures does not accurately represent the pump's performance. B) The length of the discharge pipe is not a measure of the pump's head. D) The height of the discharge pipe is not a direct measure of the pump's head.