ICHEM_Final_Exam

Select the option which are likely to occur in a Marine Diesel engine due to contamination of fuels

C. A and b

A. Cold corrosion/abrasive wear

B. Hot corrosion/fouling of exhaust sytem

D. None of the above

In oil refining the term "cracking" is applied to a process based on which one of the following?

a. The breakdown of heavy carbons using either heat or heat and chemical means

b. Product separation by atmospheric distillation

c. Removal of salt and water from crude

d. Product separation by vacuum distillation

What does the term "saturated " means when used to describe hydrocarbon molecules?

A. That the molecules include contaminants

B. That there are more carbon than hydrogen atoms in the molecules

c. That the atoms are joined together with single bonds

D. That the oils has high water content

Marine residual oil are classed as distillate fuel

a. true

b. Most of the time

c. False

d. always

Which of the following options is the best description of Marine Diesel oil?

a. High grade residual fuel

b. High grade distillate fuel

c. Mainly residual fuel with a small proportion of distillate fuel

d. Mainly distillate fuel with a small proportion of heavy fuel

Select the contaminants that may be present in crude oil

a. Water and microbes

b. Rust and foreign material

c. Aluminum and silicon

d. Vanadium and sulphur

Select the contaminants that may be present during the refining process

a. Water and microbes

B. Rust and foreign material

c. Aluminum and silicon

d. Vanadium and sulphur

Select the contaminants that may be present when transporting fuel

a. Rust and foreign material

b. Vanadium and sulphur

c. Aluminum and silicon

D. Water and microbes

Select the contaminants that may be present when fuel is stored.

a. Rust and foreign material

B. Vanadium and sulphur

c. Aluminum and silicon

d. Water and microbes

To remove as much catalytic fines as possible the residual fuel should?

A. Be drained, drained fuel oil service and settling tanks every watch

B. Be mixed it with distillate fuel

C. Be added an additives or increased the quantity of fuel additives

d. Use a fine filters and feed at optimum low throughput rates in purifier

Which of the following is not happens when fuel has water content is above 0.05%

A. Injector life is reduced by half compared to 0.02%.

B. Will cause damage to the injection system.

C. Will adversely affect the lubricating properties.

D. None of the choices.

What is the main cause to alter the viscosity of a lube oil?

A. High temperature and contamination.

B. Friction and resistance of engine's moving parts.

C. Maintaining complete separation of moving parts.

D. Sealing effectiveness to bearing surfaces.

The most significant fuel quality issue in the field is

A. Contamination from dirt and water

B. Combustion quality cetane index

C. Ignition quality due to CCAI

D. Injection quality due to MCR

Improper fuel droplet size of due to damaged injectors will

A. Require more heat to complete the combustion process.

B. Increase the combustion efficiency due to increase quantity.

C. Attain more combustion and increases heat.

D. None of the choices

Reducing Too much of sulfur content in diesel oil will_________

A. Increase fuel quality.

B. Meet the sulfur requirement.

C. Cause poor lubricity

D. Increase lubricity due to reduced contaminants.

What happens when the cetane number of the fuel is low?

A. It causes delayed ignition.

B. It causes incomplete combustion.

C. It prevents the engine from knocking during start up.

D. It prevents engine damage overtime.

Which of the following statement suits more as: Laboratory test analysis of fuel oil will

A. Provide a good resource for trouble shooting.

B. Provide an information of the physical properties.

C. Provide information for the chemical properties.

D. Provide information within normal range which is more important.

Marine Engine operation has major effects on its lubricating oil such as?

A. Complete destruction of the oil.

B. Unchanged physical and chemical properties in the oil

C. Decontamination of oil by foreign matter

D. Filtering and recirculation of oil.

Total base number (TBN) of oil reduces when

A. The lube oil becomes used and old.

B. When used oil is mixed with new lube oil.

C. When fuel used has high levels of sulfur

D. When oil is diluted with water.

What does a Total Base Number (TBN) do to the engine?

A. It protects the engine from dilution of fuel.

B. It neutralizes the engine from carbon contamination.

c. It neutralizes acids that gets into the crankcase.

D. All the choices.

ICHEM_Final_Exam

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