Pump
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Questions and Answers

What is the purpose of priming a pump?

  • To fill the pump chamber with liquid before operation (correct)
  • To measure the pressure difference across the pump
  • To create a continuous flow of liquid
  • To increase the temperature of the pump
  • What phenomenon can occur due to vapour bubbles bursting inside a pump?

  • Increased efficiency of the pump
  • Cavitation, causing pump damage (correct)
  • Reduced pressure difference
  • Continuous flow improvement
  • What does throttling refer to in pump operations?

  • Completely opening the discharge valve
  • Increasing the pressure difference across the pump
  • Slowly closing the discharge valve to decrease flow (correct)
  • Operating a pump under no load
  • What can deadheading a pump potentially cause?

    <p>Line ruptures or reduced pump life</p> Signup and view all the answers

    What is meant by differential pressure in the context of pumps?

    <p>The pressure difference driving liquid flow through the pump</p> Signup and view all the answers

    Which type of pump is primarily designed to deliver a fixed quantity with each stroke or cycle?

    <p>Positive displacement pump</p> Signup and view all the answers

    What factor primarily governs the selection of a pump type for transferring sensitive products?

    <p>Physical and chemical properties of the material to be transferred</p> Signup and view all the answers

    Which property of a food product like mayonnaise changes as shear rate increases?

    <p>Viscosity</p> Signup and view all the answers

    Why is hot water particularly challenging to pump?

    <p>It has no lubricating qualities.</p> Signup and view all the answers

    Which of the following is NOT a type of positive displacement pump?

    <p>Centrifugal pump</p> Signup and view all the answers

    What is the main mechanism by which centrifugal pumps deliver fluids?

    <p>Centrifugal or rotational force</p> Signup and view all the answers

    What must be done before a centrifugal pump can operate effectively?

    <p>Prime the pump with liquid</p> Signup and view all the answers

    What happens to the flow rate of a centrifugal pump when the outlet valve is adjusted?

    <p>It can be controlled or varied</p> Signup and view all the answers

    Which type of liquids are centrifugal pumps best suited for?

    <p>Watery liquids and those with suspended solids</p> Signup and view all the answers

    What is a common limitation of centrifugal pumps regarding viscosity?

    <p>They operate best with liquids having less than 300 cP viscosity</p> Signup and view all the answers

    During the operation of a centrifugal pump, what does the impeller do?

    <p>Throws liquid outwards towards the outlet</p> Signup and view all the answers

    What can happen if vapor bubbles form inside a centrifugal pump?

    <p>Cavitation damage may occur</p> Signup and view all the answers

    Why is it essential to keep the inlet valve of a centrifugal pump open once it is primed?

    <p>To allow continuous flow and prevent air from entering</p> Signup and view all the answers

    What is the primary component that allows rotary pumps to function effectively in pumping viscous fluids?

    <p>Interlocking rotors</p> Signup and view all the answers

    Which characteristic distinguishes a rotary gear pump from other pump types?

    <p>It has stationary casings and rotating gear wheels</p> Signup and view all the answers

    What happens to the liquid in a rotary gear pump as the rotors turn?

    <p>It is caught between the teeth of the rotors and casing</p> Signup and view all the answers

    What is one limitation of rotary pumps regarding the types of liquids they can effectively handle?

    <p>They struggle with liquids that lack lubricating properties</p> Signup and view all the answers

    Why do rotary gear pumps experience fewer problems with cavitation?

    <p>They maintain a high pressure during use</p> Signup and view all the answers

    In what type of applications are rotary gear pumps particularly useful due to their generated pressures?

    <p>Membrane filtration systems</p> Signup and view all the answers

    Which of the following types of rotary pumps utilizes semi-interlocking mechanisms?

    <p>Gear pumps</p> Signup and view all the answers

    What is a notable advantage of rotary pumps over reciprocating pumps in terms of flow?

    <p>They can achieve higher flow rates</p> Signup and view all the answers

    What is the primary function of a peristaltic pump?

    <p>To transport fluids using positive displacement</p> Signup and view all the answers

    Which of the following is an advantage of using peristaltic pumps?

    <p>They minimize shear forces experienced by the fluid</p> Signup and view all the answers

    In what scenario are peristaltic pumps particularly beneficial?

    <p>When cross-contamination of fluids must be avoided</p> Signup and view all the answers

    How does the compression process in a peristaltic pump affect the fluid?

    <p>It occludes the tube, forcing fluid movement</p> Signup and view all the answers

    Why are peristaltic pumps considered easy to clean and sterilize?

    <p>Only the tube comes into contact with the fluid</p> Signup and view all the answers

    What characteristic of peristaltic pumps contributes to their lower cost of maintenance?

    <p>Their design eliminates the need for valves and seals</p> Signup and view all the answers

    What type of rotor forms are available for rotary lobe pumps?

    <p>Bi-wing and multi-lobe options</p> Signup and view all the answers

    How is fluid flow induced in a peristaltic pump during operation?

    <p>By the natural reopening of the tube after compression</p> Signup and view all the answers

    What is a primary characteristic of a piston pump's operation?

    <p>It expels liquid only during the delivery stroke.</p> Signup and view all the answers

    What type of flow is typically produced by a piston pump?

    <p>Pulsed flow</p> Signup and view all the answers

    What distinguishes a diaphragm pump from a piston pump?

    <p>Fluid does not come into contact with the pump mechanism.</p> Signup and view all the answers

    Why is the choice of diaphragm material important in diaphragm pumps?

    <p>It ensures compatibility with the fluid being pumped.</p> Signup and view all the answers

    How can pulsed flow be mitigated when using reciprocating pumps?

    <p>By utilizing double acting reciprocating pumps.</p> Signup and view all the answers

    In which industry are diaphragm pumps frequently used, and why?

    <p>Pharmaceutical, to prevent contamination of products.</p> Signup and view all the answers

    What is a key advantage of using reciprocating pumps?

    <p>They can generate high pressures suitable for various applications.</p> Signup and view all the answers

    Which feature of diaphragm pumps minimizes the risk of pump corrosion?

    <p>The isolation of the fluid from the pump mechanism.</p> Signup and view all the answers

    What is one major advantage of using a double-acting diaphragm pump over a single-acting one?

    <p>It allows for continuous, non-pulsed flow.</p> Signup and view all the answers

    Why might pulsed flow be undesirable in certain applications?

    <p>It can result in inaccurate delivery of set volumes.</p> Signup and view all the answers

    What is a common consequence if a reciprocating pump experiences deadheading?

    <p>It can cause catastrophic pipe or pump ruptures.</p> Signup and view all the answers

    How do diaphragm pumps differ from piston pumps in the pharmaceutical industry?

    <p>Diaphragm pumps provide better protection against corrosion.</p> Signup and view all the answers

    What characteristic of reciprocating pumps can make them less suitable for certain liquids?

    <p>They have slower flow rates compared to centrifugal pumps.</p> Signup and view all the answers

    What is the operational principle of a single-acting diaphragm pump?

    <p>Liquid is drawn in during the suction stroke and expelled during the delivery stroke.</p> Signup and view all the answers

    What type of liquids are reciprocating pumps typically unsuitable for?

    <p>Liquids with high viscosity.</p> Signup and view all the answers

    What happens during the initial suction stroke in a diaphragm pump?

    <p>The diaphragm flexes to draw in fluid from the chamber.</p> Signup and view all the answers

    In what context are safety relief valves particularly important in reciprocating pumps?

    <p>To avert pressure increases that could rupture components.</p> Signup and view all the answers

    What is one effective method to prevent the dangerous build-up of static electricity in pumps?

    <p>Earthing the pump or pipeline</p> Signup and view all the answers

    Which of the following should an operator report immediately when observing unusual signs from a working pump?

    <p>Excessive heat generation</p> Signup and view all the answers

    What consequence can occur if operators do not follow specified operational procedures for pumps?

    <p>Increased wear and tear on the pump</p> Signup and view all the answers

    Why is it critical to choose the correct type of pump for a specific operation?

    <p>To prevent hazardous situations and ensure efficiency</p> Signup and view all the answers

    Which scenario is most likely to pose a risk of static electricity in a pumping system?

    <p>Transferring flammable or explosive materials through pipelines</p> Signup and view all the answers

    Study Notes

    Pump Priming

    • Priming is necessary for some pumps.
    • It involves filling the pump chamber with the liquid before operation.
    • Priming replaces air with liquid in the pump's chamber.
    • Incorrect priming can prevent some pumps from working.

    Pump Flow Characteristics

    • Pulsed flow: pump liquid flow that stops and starts periodically.
    • Vapour bubbles: liquids pumped at low pressure can create vapour bubbles.
    • Cavitation: bursting vapour bubbles inside the pump can cause significant damage.

    Pump Pressure and Flow Control

    • Differential pressure: the pressure difference across a pump drives the liquid flow.
    • Throttling: slowly closing a valve on a pump's discharge reduces flow.
    • Dead-heading: operating a pump with the discharge valve fully closed.
    • Dead-heading can damage some pumps or cause piping failures.

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    Description

    This quiz explores the essential principles of pump operation, including priming, flow characteristics, and pressure control methods. Understand the importance of proper priming and the impact of various flow dynamics on pump performance. Test your knowledge on how different conditions can affect pump functionality.

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