SELF ASSESSMENT EXERCISE 1 (HYDRAULIC FLUID)
You will need to have read the tutorials on fluids and reservoirs to answer the following questions.
- List the additives in oil identified by the code HV.
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- What normally happens to the VISCOSITY of a fluid when it get hotter.
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- State the names of THREE types of fire resistant fluid
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- What does viscosity measure?
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- State 2 seal materials which are compatible with phosphate ester fluids?
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- State two hydraulic hose materials which are compatible with phosphate ester fluids?
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- What is the meaning of viscosity index?
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- State two effects a fluid with a poor viscosity index would this have on a machine running hot?
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- List 2 reasons why hydraulic oil may overheat when in use.
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- What is the difference between an oil/water emulsion and a water/oil emulsion?
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- State two disadvantages of water as a hydraulic fluid.
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- State 2 reasons why oil should not be stored in open containers.
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- State the danger associated with oils with a low flash point.
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- State two measures you would use to ensure that a hydraulic machine is not topped up with the wrong
type of fluid.
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- State the correct colour coding for a pipe carrying mineral hydraulic oil under pressure.
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- State the reason why hydraulic oil should not be allowed to cascade into the tank on return.
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- State how water may form in a hydraulic tank over a period of time.
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- State the consequence of letting air mix with mineral oil.
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- State 2 consequences of using a tank which is too small for a hydraulic machine.
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- State the purpose of baffles inside hydraulic tanks.
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