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THEORY 4 > hydraulics > Flashcards

hydraulics Flashcards

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1
Q

what are the two categories of hydraulic oil

A

petreleum based

synthetic based

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2
Q

what are the hydraulic O-rings made from, what temperature do they retain their elastic properties and what happens if that burn

A

they are made up of flurocarbon elastomers

they retain at 300’c

they give off toxic gases including hydrogen fluoride when burned

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3
Q

advantages of hydraulics over electric systems

A 
.RELIABLE
.SIMPLE AND EASY TO UNDERSTAND
.EASILY REVERSED
.INFINITE SPEED RANGE
.NO SPARK RISK
.HIGH TORQUE AT LOW SPPEDS
.ABILITY TO WITHSTAND OVERLOAD 
.1/12 SIZE OF EQUILAVENT ELECTRIC MOTOR
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4
Q

disadvantage of hydraulics over electric systems

A

.fire risk on mineral oil systems
.noise
.risk of connection
.less efficient (85-95)

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5
Q

what type of oil is used on, stating number and colour?

submarines
type23& 45
T22, T42 and cvs

A

on a submarine they use ox 30 which is red in colour

on T42, T22 & CVS they use OX33 which is yellow/orange in colour

on type 23&t45 it used OX40 which is green in colour

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6
Q

when working with fluorocarbon elastomers you must wear what ppe

A

pvc gauntlets
rubber boots
pvc coveralls
full face visor

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7
Q

what is to be taken before welding or burning in the vicinity

A

safety precautions

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8
Q

what are the following oil additives

A

anti foam
anti oxidants
anti corrosion
demulsibilty

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9
Q

what are the requirements for hydraulic fluid

A

must flow easily
must be incompressible
give up heat readily
good lubrication properties

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10
Q

what are the most causes of contamination in hydraulic oil

A 
.airborne particles and moisture 
.construction dirt 
.dirt in new fluid
.dirt produced by wearing in new systems
.dirt from human sources
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11
Q

what are the methods for reducing contamination

A 
.good design
.filtration and filter maintenance 
.operation of filter and clogging indicator 
.good working practises 
.guardian filter pack
.caps on open ended pipes 
.clean working area
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12
Q

types of pump:

A 
external gear type pump
internal gear type pump
the vane pump
lobe pump
piston type pumps(single)
piston type pump(multi)
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13
Q

what does the swash plate control?

A

it controls the direction and flow of pressure

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THEORY 4 (3 decks)

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