WorksheetsBOILER TROUBLES
Total questions: 10
Worksheet time: 8mins
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.
Is hard water need to be converted to soft water before fed in to boilers?
Always
Not always
rare
optional
Coagulants help in the settling of
suspended impurities only
fine suspended matter only
colloidal particles only
both (B) and (C)
Total hardness equals
Temporary hardness
Permanent hardness
Temporary hardness + Permanent Hardness
Temporary hardness - Permanent Hardness
Temporary hardness is due to the presence of
Bicarbonates of Ni & Mg
Bicarbonates of Ca & Mg
Chlorides of Ca & Ni
Sulphates of Mg & Ca
Boiler feed water contains hardness of
0 PPM
< 0.2 PPM
> 0.2 PPM
= 0.2 PPM
If your boiler water contains oil and turbidity causing ions the resulting boiler troubles are
Scales & Sludges
Priming & Foaming
Caustic Embrittlement
Boiler Corrosion
The indicator employed for detection of hardness during titration with EDTA solution is
Methyl orange
Phenolphthalein
Eriochrome-Black-T
Diphenyl amine
