WorksheetsWATER TECHNOLOGY
Total questions: 20
Worksheet time: 10mins
Hardness in water is caused by the presence of:
Sodium chloride
Sodium carbonate
Calcium chloride
Potassium nitrate
Permanent hardness in water is caused by the presence of:
Calcium bicarbonate
Magnesium sulfate
Both of them
None of them
Water is hard when it contains:
Acid solution
Precipitate in suspension
Dissolved sodium salts
Dissolved Ca and Mg salts
Which of the following does not cause the permanent hardness in water?
Nitrates
Sulphates
Chlorides
Bicarbonates
In _____________ when the water is heated then the soluble salts turns into insoluble ones and removed by filtration.
Temporary hardness
Permanent hardness
Non-carbonate
Non-alkaline
Scale formation in boilers causes
no loss of heat
wastage of heat
increase in efficiency
none of the above
Blow-down operation causes the removal of
SCALES
SLUDGES
BOTH OF THESE
HOT WATER ONLY
Hard water is unfit for use in boilers for “steam raising” because
its boiling point is higher
steam generated at a high pressure
it leads to scale formation inside the boiler
water undergoes decomposition in to oxygen and hydrogen.
What is the function of a boiler?
to heat water to make steam
to heat water to make spaghetti
to transform liquid into a mist
to mix air and fuel
What two products are required (needed) to produce (make) steam?
water
heat
fan
boiler
True or false. When water is heated to its boiling point, it changes from a liquid to a vapor.
true
false
hardness is a measure of scale forming __ dissolved in water
minerals
pollutants
gases
none of the above
deposits of calcium and magnesium carbonates on the boiler heating surface cause ___
scale
oxygen pitting
caustic embrittlement
carryover
priming is dangerous and can lead to ___ hammer
steam
water
gas
air
scale buildup on the water side of a steam boiler is caused by ___
an impure water supply
scale in raw water
improper boiler water treatment
none of the above
boiler water is treated to prevent...
scale
oxygen pitting
caustic embrittlement
all of the above
boiler water having high alkalinity could develop ___
acidic corrosion
oxygen pitting
caustic embrittlement
warping
