Reciprocating pump: theoretical power requirement (watts) Given: specific weight of liquid w (N/m³), discharge Q (m³/s), suction head H s (m), delivery head H d (m). Write the theoretical power to drive the pump (neglecting loss…

Q: Reciprocating pump: theoretical power requirement (watts) Given: specific weight of liquid w (N/m³), discharge Q (m³/s), suction head H s (m), delivery head H d (m). Write the theoretical power to drive the pump (neglecting loss…

Concept Pump power (ideal) = weight flow rate × total static head raised. Calculation Weight flow rate = w Q (N/s). Total head = Hs + Hd. Ptheoretical = w Q (Hs + Hd) (watts). Final Answer w Q (Hs + Hd)

Home » Mechanical Engineering » Hydraulic Machines

Reciprocating pump: theoretical power requirement (watts) Given: specific weight of liquid w (N/m³), discharge Q (m³/s), suction head H<sub>s</sub> (m), delivery head H<sub>d</sub> (m). Write the theoretical power to drive the pump (neglecting losses). Choose the correct option.

Difficulty: Easy

w Q H_s
w Q H_d
w Q (H_s − H_d)
w Q (H_s + H_d)

Correct Answer: w Q (H_s + H_d)

Explanation:

Concept
Pump power (ideal) = weight flow rate × total static head raised.

Calculation
Weight flow rate = w Q (N/s). Total head = H_s + H_d. P_theoretical = w Q (H_s + H_d) (watts).

Final Answer
w Q (H_s + H_d)

← Previous Question Next Question→

More Questions from Hydraulic Machines

Reciprocating pump slip: definition based on discharges Define the slip of a reciprocating pump using theoretical discharge and actual discharge. Pick the correct expression. Choose the correct option.
Pelton wheel unit power: compute from given head and output A Pelton wheel develops 1750 kW under a head of 100 m, runs at 200 r.p.m., and discharges 2500 L/s. Find the unit power of the wheel (power at unit head for a similar turbine). Choose the correct value.
Turbine runner speed–head relation For dynamically similar turbines, how does runner speed N vary with available head H? Assume unit-speed similarity criteria apply. Choose the correct proportionality.
Maximum propulsive efficiency for jet-propelled ship with side inlets A ship uses jet propulsion with inlet orifices at right angles to its motion. What is the maximum possible propulsive efficiency for this configuration? Choose the correct percentage.
Centrifugal pump similarity: discharge vs. rotational speed How does the discharge Q of a centrifugal pump vary with impeller rotational speed N (all else equal)? Choose the correct relation.
Centrifugal pump similarity: discharge vs. impeller diameter For a given speed and inlet width, how does discharge Q vary with impeller diameter D in a centrifugal pump? Choose the correct dependence.
Fluid mechanics: definition of geometric similarity between model and prototype Compare model and prototype for geometric similarity in hydraulic/thermal machinery modeling. Choose the correct statement that defines geometric similarity.
Turbomachinery performance parameter: unit discharge For a turbine operating under head H with discharge Q, express the unit discharge (i.e., the discharge referred to a head of 1 m). Choose the correct formula.
Starting condition for a centrifugal pump to deliver liquid Identify the correct head rise condition inside the impeller that must be met before flow is delivered to the discharge line. Choose the correct head term.
The working of which of the following hydraulic units is based on Pascal's law?

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion