Why is it important for the Boiler Water to be treated?

• To prevent corrosion, oxygen production, heat production, and acid production

• To prevent corrosion, foaming, and priming

• To prevent water from evaporating too fast and over pressuring the boiler

• To prevent scale from producing inside the furnace area of the boiler

Scale is a major problem in the boiler and cooling water system because it has which of the following property?

• It can produce carbon dioxide with excessive heat and thus promoting corrosion

• It causes tubes to fail due to corrosion and scale

• It does not transfer heat very well

• It causes the steam to be condensed easily throughout the closed system

Why is Fresh Water Cooling Water Treatment done?

• To avoid any risk of main engine failure that can be caused by the lack of chemical input to the closed system

• To minimize the risk of corrosion, scaling, and microbiological buildup

• To minimize the production of scaling inside heated surfaces in boilers before the production of steam

• To avoid the failure of the boiler tubes and create internal fire inside the system

Why is it that the chloride value of cooling and boiler water should be kept as low as possible?

• because it indicates the acidity of cooling and boiler water

• because it indicates the salt content of the cooling and boiler water

• because it indicates the microbial growth in the cooling and boiler system

• because it indicates the hard scaling in the pipes of the cooling and boiler system

If the water analysis shows a build up of scale or deposits in the boiler or cooling water system, which of the following is the appropriate treatment method?

• Cleaning and descaling procedures should be carried out

• using chemicals to neutralize the water

• adjusting blown down rate to determine the amount of blowndown

• Appropriate corrosion inhibitors can be added or adjusted to mitigate this problem.

Which of the following can be a remedy if there will be a high water contamination in the lube oil?

• overhaul in the lube oil system

• neutralize the lube oil

• Batch purification

• use some additives

A property of lube oil that indicates if the oil is suitable for cold weather or not.

• Fire point

• Flash point

• Cloud point

• Pour point

A sample of Lube oil is found to have 10% by mass Carbon Residue. If the mass of the oil is 200g, what is the mass of carbon residue in kg?

• 0.02 kg

• 0.2 kg

• 2 kg

• 20 kg

A sample of lube oil was found to have 0.3% water content by volume. If the volume of Lube oil is 1000 L , how much water content is present?

• 0.3 L

• 3 L

• 30 L

• 300 L

Lubricants may contain 90% base oil and 10% additives by ratio. If you will prepare 200 g of lubricants, what is your correct weight combination?

• 160: 40

• 170:30

• 190:10

• 180:20