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Base oil combinations are selected to meet:
Pour point.
Viscosity index.
Operational conditions.
Oxidation stability.
Crude oils are roughly classified as:
Paraffinic, naphthenic and mixed base.
Straight and branched chain.
Waxy and asphaltic.
Heavy and light.
Friction modifiers or “oiliness additives” will:
Improve the viscosity index.
Reduce friction under boundary conditions.
Increase the pour point.
Extend lubricating oil life time.
In which type of equipment is low pour point and good wax depositing important?
Refrigeration compressors.
Deck winches.
Medium speed trunk engines.
Hydraulic cranes.
Lubricant base oils generally exhibit boiling points above:
300 °C.
200 °C.
150 °C.
100 °C.
Marine lube oil extracted from Naphthenic Base oil is suitable as:
回答
Mineral oils are generally complex mixture of Hydrocarbons. What is the range of presence of carbon atoms in one molecule of hydrocarbon in a Lubricant base oils?
20-50.
50-70.
Name the properties, that are exhibited by Aromatic hydrocarbons?
Poor chemical stability.
High viscosity indices.
High pour points.
Name the two properties of Marine Lube oil extracted from paraffin base oil:
回答
Oxidation inhibitors are:
Removing oxygen from the oil.
Dissolving oxygen in the oil.
Preventing rust.
Counteracting chemical breakdown.
Solvent extraction is a:
Vacuum distillation process.
Physical process removing aromatics.
Atmospheric distillation process.
Hybrid process.
Synthetic hydrocarbons are:
Organic esters.
Fluoroalkylether and silicate esters.
Polyolefin’s, hydrocracked mineral oils and alkylates.
Polyether’s and polyalkylene glycols.
Synthetic oils are manufactured by:
回答
The main advantages of Synthetic oil over mineral oil are:
回答
The refined lubricant base oil properties are greatly influenced by:
Storage and treatment.
Refining process.
Chemical treatment.
Crude oil composition or origin.
This is an example of:
Elastohydrodynamic lubrication.
Hydrodynamic lubrication.
Boundary lubrication.
Extreme pressure lubrication.
What is EP (Extreme Pressure) oil?
Additive forming a protective chemical surface film.
High pressure hydraulic oil.
Standard gear oil.
High maximum pressure cylinder oil.
What is a typical BN level for a two stroke engine cylinder oil?
BN 70 – BN 100.
BN 10 – BN 20.
BN 50 – BN 70.
BN 5 – BN 10.
What is elastohydrodynamic lubrication?
A combination of different lubricating oils.
An additive to keep the viscosity index stable under various conditions.
The contacting surfaces are elastically deformed, distributing the load over a greater area.
Water is added to the oil because it is not compressible and we can increase the load.
What is mixed lubrication?
When formation of a fluid film is partly established.
When using grease and lubricating oil together.
When mixing mineral and synthetic oils.
When changing type of lubricating oil from time to time.
What is the “NLGI” number of a grease indicating?
How water resistant the grease is.
How fluid or non-fluid the grease is.
The grease compatibility.
The grease expected life time.
What is the main criterion for fluid lubricants operating under hydrodynamic conditions?
Viscosity.
Anti-wear agents.
Flow of lubricant.
Temperature of bearing.
What is the most important property of a lubricating oil for reciprocating air compressors?
Good anti-wear property.
High viscosity index.
Low carbon-forming tendency.
Good corrosion protection.
What is the single most important element for gear oils?
Shear stability.
Anti-wear performance.
Corrosion prevention.
Viscosity.
What is typical BN level for a trunk piston engine operating on residual fuel oil?
BN 70 – BN 100.
BN 5 – BN 10.
BN 40 – BN 50.
BN 30 – BN 40.
What type of refiring process will greatly reduce the influence Crude oil origin?
Solvent refining.
Severely hydro-processed.
Why can EP Additives only be used on ferrus metal surfaces?
Will be chemically bound to other metals.
Will change viscosity.
May be corrosive to other metals.
Will change chemical composition.
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