Positive Displacement Pumps and Pressure Relief Quiz

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What type of pump uses a flexible tube squeezed progressively by a roller to move fluid?

Centrifugal pump

Peristaltic pump (correct)

Progressive cavity pump

Axial flow pump

Which type of pump is suitable for pumping sludge, abrasive liquids, and industrial chemicals?

Mixed flow pump

Centrifugal pump

Progressive cavity pump (correct)

Axial flow pump

What characteristic distinguishes dynamic (roto-dynamic) pumps from positive displacement pumps?

They move a specific amount of liquid regardless of pump head.

They do not have suction or discharge check valves.

They add energy continuously. (correct)

They have a single helical stainless steel rotor mounted within an elastomer-lined stator.

In which type of centrifugal pump does the liquid enter the centre of the impeller and exit perpendicular to the pump shaft in a radial direction?

Volute pump Signup and view all the answers

What is the key feature of axial flow pumps?

Use a propeller instead of an impeller Signup and view all the answers

What does a centrifugal pump's capacity change with?

Change in pump head Signup and view all the answers

What is the main characteristic of a positive displacement pump?

It moves liquid by creating a void and forcing liquid out Signup and view all the answers

How do positive displacement pumps differ from dynamic pumps?

Positive displacement pumps move a specific amount of liquid at a constant speed Signup and view all the answers

What causes the discharge pressure to pulsate in positive displacement pumps?

Intermittent application of energy to the fluid stream Signup and view all the answers

Which types of pumps are reciprocating pumps classified under?

Positive displacement pumps Signup and view all the answers

What creates voids in reciprocating pumps?

The movement of plungers, pistons, or diaphragms Signup and view all the answers

What causes the movement of liquid into the low-pressure void of a reciprocating pump?

The atmospheric pressure exceeding the pressure in the void Signup and view all the answers

What will happen if a centrifugal pump is run for extended periods with its discharge valve shut?

Cavitation, vapour-binding, and damage to the pump Signup and view all the answers

What is the consequence of throttling or closing the suction valve of a centrifugal pump?

Destructive cavitation and damage to the impeller Signup and view all the answers

Why are large centrifugal pumps started with a closed discharge valve?

To avoid excessive power surges during pump startup Signup and view all the answers

What is the main consequence of cavitation in a centrifugal pump?

Mechanical destruction of the pump if left unchecked Signup and view all the answers

What is the characteristic feature of a regenerative (turbine) pump?

Develops pressures several times that of a centrifugal pump Signup and view all the answers

Why must a regenerative (turbine) pump always have flow through it at all times?

To avoid mechanical destruction of the pump Signup and view all the answers

What happens when bubbles formed due to cavitation collapse on the surface of the impeller?

The impact damages the metal surface Signup and view all the answers

What type of pump uses a flexible diaphragm to increase and decrease the size of the void?

Diaphragm pump Signup and view all the answers

Which type of pump delivers high pressure liquid without the pulsations that occur in reciprocating pumps?

Rotary pump Signup and view all the answers

In a double-acting pump, when is the fluid moved?

On each stroke Signup and view all the answers

What distinguishes a diaphragm pump from a plunger or piston pump?

The use of flexible diaphragm to move the fluid Signup and view all the answers

What are the two variations of rotary pumps mentioned in the text?

External gear pump and sliding vane pump Signup and view all the answers

Which type of reciprocating pump has a larger capacity than the plunger-style pump?

Piston-style pump Signup and view all the answers