The question asks for the definition of "head" in pump terminology. This term is fundamental in fluid mechanics and pump performance analysis, representing the energy added to a fluid by a pump, expressed as an equivalent height of a column of the fluid.
B) The distance a pump can lift fluid — This accurately describes the concept of "head." Head is a measure of the energy imparted to the fluid by the pump, expressed as the equivalent vertical height of a column of that fluid that the pump can overcome or lift. This includes overcoming static lift, friction losses, and maintaining flow velocity.
The question asks to identify the pump commonly used for sewage and sludge. This requires knowledge of the characteristics and applications of different types of pumps, particularly their suitability for handling viscous fluids with solids.
Correct Option: D) Screw pump
The question asks for a common application of gear pumps. Gear pumps are positive displacement pumps known for their ability to handle viscous fluids and provide a constant flow rate against varying pressure. We need to identify which of the given options best fits these characteristics.
Correct Option: B) Hydraulic Fluid pumping. Gear pumps are widely used in hydraulic systems due to their ability to handle high pressures, pump viscous fluids, and provide a consistent flow rate, which are essential requirements for hydraulic power transmission.
The question asks about the primary purpose of a pump curve. A pump curve is a graphical representation that provides crucial information about a pump's performance characteristics. Understanding what parameters are typically plotted on a pump curve will lead to the correct answer.
Correct Option: A) Display the relationship between flow rate and pressure. This is the fundamental purpose of a pump curve. It graphically represents how the head (which is a measure of pressure) produced by the pump varies with the flow rate (volume of fluid pumped per unit time).
The question asks about the primary function of a mechanical seal in a pump. We need to understand what a mechanical seal is and what problem it is designed to solve in pump operation.
B) Prevent leakage — Mechanical seals are specifically designed to create a tight seal between the rotating shaft and the stationary pump casing, thereby preventing the pumped fluid from leaking out and preventing external contaminants from entering the pump.
The question asks to identify a type of pump that moves fluids without direct contact between the pump's mechanical parts and the fluid. This implies a need for isolation, often for corrosive, sterile, or hazardous fluids. We will evaluate each pump type based on its operating principle to determine which one fits this description.
B) Magnetic drive pump — A magnetic drive pump uses magnets to transmit torque from the motor to the impeller, eliminating the need for a shaft seal. This creates a hermetically sealed pump chamber, ensuring that the fluid does not come into direct contact with the motor or the outside atmosphere, making it ideal for handling corrosive, toxic, or high-purity fluids.