Engineering knowledge Week 3 - Detalles

Niveles:

1) Chapter 1 Visualizar

Preguntas:

63 preguntas

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

True

T/F Positive displacement pumps need to be primed before use

False (They do not need to be primed before use)

T/F Liquid is drawn into the pump body because the chamber's volume is changing

True

T/F PD pumps are fitted with a relief device to allow for liquid to return to the suction side

True

T/F The flow rate and volume for these pumps is usually quite high

False (Low)

T/F The reciprocating pump is the simplest version of a PD pump there is

True

T/F reciprocating pumps can be both single and double acting

True

In electrically driven reciprocating pumps the handle is replaced by a crankshaft that is attached to the spindle.

False (reciprocating pump has a connecting rod, not a spindle)

T/F As the mechanical shaft rotates it converts rotary motion to reciprocating motion and actuates the piston within the reciprocating pump

True

T/F Reciprocating pumps are found in high pressure fuel systems

True

T/F Reciprocating pumps are found in bilge systems

True

T/F Reciprocating pumps are found in pressurized HVAC systems

False (they are found in high pressure fuel systems and bilge systems)

Rotary motion pumps use rotary motion to vary the volume of the chamber within the pump body

True

There are three kinds of rotary pump

False (Gear Pumps, Screw Pumps, Vane Pumps, and Progressive Cavity Pumps)

A screw pump is an example of a rotary motion pump

True

A rotating vane pump is an example of a rotary motion pump

True

Gear pumps come in three types: internal gear pumps, external gear pumps, and diternal gear pumps

False (diternal does not exist)

An external gear pump contains two gears, one with internally cut teeth and the other with externally cut teeth

Fasle (This is the description of an internal gear pump)

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.)

A small amount of liquid leaking back to the inlet port is called spill

False (term: Slip)

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)

An internal gear pump contains two gears; a small driver gear powered by a motor or related machinery and a larger rotor gear powered by the driver gear.

False (the large gear is the driver gear and the small gear is the rotor gear)

Internal gear pumps can be found as lift pumps in fuel oil supply systems

True

Vane pumps are not positive displacement pumps

False (they are)

Rotary vane pumps have a central rotor that is fitted with vanes and turns inside an eccentric casing

True

The vanes in a rotary vane pump are constructed out of low friction materials such as PVC or ABS plastics

False (they are made primarily out of carbon or steel)

Rotary vane pumps are used in hydraulic systems

True

A rubber impeller is another form of rotary vane pump

True

The progressive cavity pump has a helical screw rotor fabricated from chromed carbon steel that turns inside a flexible rubber casing called the stator.

True

The stator is encased in a metal casing for strength

True

As the rotor turns inside the progressive cavity pump, a cavity is formed at the suction end and traps the fluid

True

Progressive cavity pumps can operate at high speeds

False (low speeds)

Progressive cavity pumps are used mainly for pumping bilges waste or on sewage systems

True

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.)

The rate of flow in a swash plate pump will be infinite in both directions

True

Positive displacement pumps are self priming

True

Positive displacement pumps require a separate suction priming system

False (They do not require one, although one may be fitted)

Making a reciprocating pump double valved will increase the efficiency of the pump

False (term: double acting)

In an internal gear pump the inlet is sealed to the outlet by a crescent shaped insert

True

Spring activated suction and discharge valves must be fitted to a reciprocating pump

True

The vanes in a vane pump are held against the casing by centrifugal springs

False (integral slots hold the vanes against the casing)

What type of pump is normally used for engine lubrication?

Rotary screw

Progressive cavity pumps are utilized in systems where high turbulence is not an issue

False (these pumps are used in low turbulence systems)

Flow rate in a positive displacement pump is usually quite low

True

The meshing together of the teeth in a gear pump creates pressure

True

Rotary screw pumps can have multiple driven screws

False (one driven screw)

Axial piston pumps have pistons attached to a swash plate

True

Positive displacement pumps move fluid by centrifugal force

False (by mechanically varying the volume of a cavity)

Radial piston pumps produce low pressure

False (high pressure)

Positive displacement pumps come in two main categories: rotary and reciprocating

True

Rotary vane pumps are positive displacement pumps that have a central rotor that is fitted with vanes and turns inside an eccentric casing

True

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)

The driveshaft on a progressive cavity pump will be fitted to a reduction gearbox

True

Reduction cavity pumps are used mostly in bilge or sewage systems where suspended solids are expected

True

The helical screw in a progressive cavity pump is constructed from chromed carbon steel that turns inside a flexable rubber casing called the stator.

True

Screw pumps are used primarily in lube oil pumps

True

Axial piston pumps have an even number of pistons more often than an odd number

False (more often having an odd number of pistons)

The housing of a axial piston pump is also known as a cylinder block, rotor, or barrel

True

A bent axis pump is most commonly used in hydraulic circuits

True

A 'valve plate pump' and a 'swash plate pump' are the same

True

Check ball pump is also known as a wobble bottom pump

False (term: wobble plate)

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