Welcome to the website where you can find answers for the Computer Based Test (CBT) also known as Crew Evaluation System (CES) on the subject «Marine Lubricants». This site will help you as a marine specialist improve your knowledge with the help of open information, where you can find questions as well as answers for them. CES/CBT based on practical information and marine specialists experience.
CES & CBT tests developed for evaluating seaman basic knowledge by Seagull Company (rebranded as «OTG»), is an evaluating online-tool, used for revealing any professional preparation needed in specific fields of knowledge, defined by STCW.
CES tests have proven themselves as good tools for the selection and recruitment process, as well as advancing the level of knowledge of the current officers and crew. Ocean Technologies Group use various subjects for question creation, which includes:
Crowd and Crisis Management;
Integrated Navigation System (INS);
Ballast water management;
Handling and Stowage;
Vessel operation management and safety;
Marine engineering;
Maintenance and repair, etc.
Current test contains Seagull CES questions on the subject «Marine Lubricants». Those questions can be used for competence verification specialist capable of preventing accidental situations related with transporting safety, or also for self-examination.
«Marine Lubricants» subject includes theoretical and practical information about oil and lubricants used on ship. Knowledge of this information directly shows employee’s competence who holds a relevant post on a vessel, provides to have understanding in lubricant materials, which can sufficiently help in detecting malfunctions and repairing, as well maintain the machinery for running stably.
This page contains answers to Seagull CES CBT (Crew Evaluation System/Computer Based Test) test about Marine Lubricants, and serve as a database of questions and answers, using which seafarer can prepare to exams for getting certificate of competence, or just to challenge yourself with knowledge in this theme.
CBT CD 0030 – Marine Lubricants.pdf
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Amount of questions: 27.
Right answers marked with this sign .
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:
Engine oils.
Turbine oils.
Refrigerator oils.
Industrial process oils.
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:
High viscosity index.
Low volatility/evaporation loss.
High pour point.
High thermal stability/resistance to cracking.
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:
Polymerisation of selected monomers.
Hydro-catalytic Process.
Synthesized by chemical processes using a variety of raw materials.
By Hybrid process.
The main advantages of Synthetic oil over mineral oil are:
The properties required by the equipment’s can be accurately met.
Longer oil life.
Low cost factor.
Low water absorption.
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.
Marine Grease – test
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