Power Engineering - 4B Part 2 1080 Study Questions with Complete

Power Engineering - 4B (Part 2) 1080 Study Questions with Complete 100% Verified Answer Latest Updated 2024/2025

Activated carbon is produced from carbonaceous material such as:

• coal
• wood
• magnesium
• coconut shells
• peat
• 1, 3, 4, 5
• 1, 2, 4, 5
• 1, 2, 3, 5
• 2, 3, 4, 5
• 1, 2, 3, 4 - Correct Answer b. 1, 2, 4, 5

Pitting of boiler metal may be prevented by

• agitating the feed water before it enters the boiler
• the addition of sodium sulphate to the feed water
• cooling the feed water to between 4C and 16C
• heating the boiler feed water to between 80C and 105C before it enters the boiler
• the addition of sodium chloride to the feed water - Correct Answer d. heating the boiler feed water to

between 80C and 105C before it enters the boiler

Bicarbonates can be easily removed from the feedwater by:

• blowing down the boiler
• using filter tanks
• heating the water just below its boiling point 1 / 4

• passing the water through a deaerator
• adding an additional screen - Correct Answer c. heating the water just below its boiling point

The spray-type and tray-type are the two basic configurations of mechanical ---------- used to remove

dissolved solids:

• clarifiers
• deaerators
• softeners
• scrubbers - Correct Answer b. deaerators

Sodium zeolite softeners

• remove all dissolved solids from the water
• remove all dissolved solids and suspended matter from the water
• remove calcium and magnesium from the water
• are regenerated with an alkaline solution
• are regenerated with an acid solution - Correct Answer c. remove calcium and magnesium from the

water

It is not true that boiler water is treated for:

• maintaining boiler water pH below 6
• preventing carryover of impurities
• scale prevention at its water side
• corrosion prevention at boiler
• sludge prevention at its water side - Correct Answer a. maintaining boiler water pH below 6

Filters are used 2 / 4

• for internal treatment
• to remove hardness
• to remove dissolved solids
• for external water treatment
• to remove calcium bicarbonates - Correct Answer d. for external water treatment

A filter should be backwashed in order to:

• regenerate the filter
• dissolve the suspended matter
• transfer liquid in the opposite direction
• flush the trapped impurities to waste
• oxidize the water - Correct Answer d. flush the trapped impurities to waste

In order to prevent the waste of steam through a deaerator vent, the component used is:

• a vent condenser
• a cyclone separator
• a chevron drier
• a scrubber - Correct Answer a. a vent condenser

Materials floating on the surface or that are dispersed throughout the water, are called:

• dissolved matter
• absorbed sludge
• suspended matter
• diluted solids
• dissolved solids - Correct Answer c. suspended matter 3 / 4

Measuring chlorides concentration can predict the:

• level of alkalinity in the boiler water
• level of dissolved oxygen in the boiler water
• level of dissolved solids in the boiler water
• level of hardness in the boiler water - Correct Answer c. level of dissolved solids in the boiler water

The capacity of a sodium zeolite softener will drop due to zeolite attrition at about:

• 15% per year
• 5% per year
• 1% per year
• 3% per year - Correct Answer d. 3% per year

Boiler water with an alkalinity that is too high will likely:

• has lot of scale
• show signs of pitting
• foam
• has grooving on its surfaces
• has a low pH - Correct Answer c. foam

Boiler water with a pH of 6 is considered:

• neutral
• alkaline
• acidic
• basic - Correct Answer c. acidic
• / 4