Boiler troubles

Scale formation in boilers causes

• no loss of heat

• wastage of heat

• increase in efficiency

• none of the above

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