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Engineering knowledge Week 3


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AaronDaines


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[Front]


T/F Positive displacement pumps operate on the principle that liquid is displaced by mechanically varying the chambers within the pump body?
[Back]


True

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63 questions
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T/F Positive displacement pumps need to be primed before use
False (They do not need to be primed before use)
T/F Reciprocating pumps are found in pressurized HVAC systems
False (they are found in high pressure fuel systems and bilge systems)
There are three kinds of rotary pump
False (Gear Pumps, Screw Pumps, Vane Pumps, and Progressive Cavity Pumps)
External gear pumps contain two gears with externally cut teeth that mesh together while rotating.
True (as the teeth disengage with one another the space formed between the teeth and casing increases volume.)
Both gears in an external gear pump are usually driven by an electric motor or related machinery
False (Usually one gear is driven and the second gear is rotated by this driver)
External gear pumps cannot handle any particulate in the liquid it is pumping, or else the pump fails
False (external gear pumps can handle small particulate but this increases the wear between moving and non moving parts)
The progressive cavity pump is incapable of processing large amounts of particulate suspended in the transported medium
False (is capable of handling fluids containing large amounts of suspended solids.)
Positive displacement pumps require a separate suction priming system
False (They do not require one, although one may be fitted)
The vanes in a vane pump are held against the casing by centrifugal springs
False (integral slots hold the vanes against the casing)
Positive displacement pumps move fluid by centrifugal force
False (by mechanically varying the volume of a cavity)
Rotary vane pumps are used primarily in fuel systems
False (they are used in hydraulic systems)
Progressive cavity pumps can operate at high speeds
False (they operate at low speeds)