HIGH PRESSURE BOILERS 1069

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HIGH PRESSURE BOILERS 1069

UPDATED ACTUAL EXAM WITH

CORRECT SOLUTIONS.

c - correct answer- Boiler water is treated in order to prevent

• sludge, mud, pitting, corrosion
• foaming, corrosion, carryover, sludge
• sludge, corrosion, scale, carryover
• scale, sludge, mud, pitting
• foaming, carryover, pitting, corrosion

d - correct answer- Dissolved solids in raw water

• cause pitting of boiler surfaces
• cause grooving of piping surfaces
• are organic matter
• cannot be removed with filters
• cause corrosion of boiler surfaces

a - correct answer- Boiler surfaces may have what appears to be blisters which are composed of 1 / 4

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• iron oxide
• sodium sulphite
• caustic soda
• ferric sulphate
• chelates

d - correct answer- Boiler water with an alkalinity that is too high will likely

• have a lot of scale
• show signs of pitting
• have a low pH
• foam
• have grooving on its surfaces

e - correct answer- Corrosion products in feedwater can cause

• slag deposits in superheaters
• decreased steam pressure
• increased steam pressure
• increase in boiler efficiency
• tube failure 2 / 4

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c - correct answer- Boiler water with a pH of 6 is considered

• alkaline
• basic
• acidic
• neutral
• acceptable for boiler water

b - correct answer- Which of the following is an example of suspended matter?

• sodium
• sand
• salt
• calcium
• magnesium

a - correct answer- Which of the following is an example of dissolved solids?

• magnesium sulphate 3 / 4

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• oxygen
• clay
• sand
• carbon dioxide

c - correct answer- Temporary hardness in feedwater is caused by

• calcium sulphate
• sodium nitrate
• magnesium bicarbonate
• calcium carbonate
• magnesium sulphate

e - correct answer- Feedwater for a high pressure boiler should be

• treated with phosphate
• treated with phenolphthalein
• treated city water
• treated with salt
• softened water
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