WorksheetsIChem Midterm Quiz 3
Total questions: 20
Worksheet time: 11mins
What is the primary function of lubrication oil in a diesel engine?
To increase engine noise
To reduce wear and heat generation
To increase exhaust emissions
Which of the following is NOT a function of lubrication oil?
Removing contaminants
Dampening noise
Increasing fuel viscosity
Acting as a sealant
In a diesel engine, where does the lubrication process begin?
Bearings
Sump (oil pan)
Lube oil pump
Oil Filter
The science and engineering of interacting surfaces in relative motion, focusing on friction, wear, and lubrication
lubrication
tribology
mechanics
morphology
The ability of an oil to react with a base reagent which indicates the acidity is expressed as TAN. What is the meaning of TAN?
(a)
What is the main concern when using high BN (Base Number) lubricant with low sulphur fuel?
Increased fuel efficiency
Liner damage due to deposits
Reduced flash point
Improved detergency
What is the effect of fuel contamination in lube oil?
Increases viscosity
Reduces viscosity and flash point
Improves detergency
Enhances thermal stability
If water content in lube oil exceeds to this level, immediate action should be taken?
0.2%
0.5%
0.3%
1.0%
Which of the following is NOT a common impurity in lube oil?
Freshwater contamination
Seawater contamination
Fuel dilution
Nitrogen gas
What is the effect of water contamination in lube oil?
Increases load-carrying capacity
Reduces cooling efficiency and promotes acid formation
Improves detergency
Enhances oxidation stability
What is the primary method to remove water contamination from lube oil?
Adding lube oil additives
Batch purification and centrifuging
Increasing oil temperature
Replace all the oil in the system
What property of lube oil refers to its resistance to flow?
(a)
What does a high viscosity index indicate?
large viscosity change with temperature
Little viscosity change with temperature
High carbon residue
Low thermal stability
What is the pour point of lube oil?
The temperature at which oil ignites
The lowest temperature at which oil stops flowing
The temperature at which wax crystals form
The temperature at which oil evaporates
A 10,000 liters of lube oil is used in the main engine, calculate the mass if its density is 980 kg/m3?
9,800 kg
980 kg
98, 000 kg
98 kg
What does TBN (Total Base Number) measure in lube oil?
Acidity
Alkalinity
Viscosity
Water content
What is the purpose of detergency additives in lube oil?
To increase viscosity
To prevent carbon deposits and wash them away
To reduce flash point
To reduce water content and prevent from emulsion
What is the cloud point of lube oil?
The temperature at which oil ignites
The temperature at which wax crystals begin to appear
The lowest temperature before oil solidifies
The temperature at which oil evaporates
The ability of an oil to react with acidic reagent which indicate the alkalinity is expressed as (a) .
Which of the following is a method to maintain lube oil quality onboard?
Running the purifier only in port
Avoiding batch purification
Regular testing and maintaining purifier performance
Ignoring water contamination
