BOC Boiler Systems and Steam 2

Question 1

What is the recommended procedure when a boiler safety relief valve lifts (opens)?

Accepted Answer

Identify and correct the cause of overpressure before resuming operation

Answer

Immediately reset it manually and continue operation

Answer

Increase feedwater flow to compensate for steam loss

Answer

Reduce fuel input only and allow the valve to reseat on its own

Question 2

In a steam heating system, what is 'two-pipe' piping?

Accepted Answer

A system with supply and return piping kept separate

Answer

A system using two parallel boilers

Answer

A system with two pressure zones

Answer

A system with dual fuel capability

Question 3

What is 'scale' in a boiler, and what problem does it cause?

Accepted Answer

Mineral deposits on heat transfer surfaces; it reduces heat transfer efficiency

Answer

A weight measurement device; it affects fuel metering

Answer

Corrosion pitting on the fireside; it weakens metal

Answer

Foam on the water surface; it causes carryover

Question 4

What condition is described as 'priming' in a steam boiler?

Accepted Answer

Violent water surging that carries water droplets into the steam supply

Answer

The initial startup procedure for a cold boiler

Answer

The process of treating feedwater with chemicals

Answer

Building pressure before opening the steam header

Question 5

What is the purpose of a feedwater economizer in a boiler system?

Accepted Answer

To preheat feedwater using waste heat from flue gases

Answer

To add chemicals to feedwater before it enters the boiler

Answer

To separate impurities from feedwater using gravity

Answer

To store emergency feedwater supply

Question 6

The boiler horsepower (BHP) rating is defined as the evaporation of how many pounds of water per hour from and at 212°F?

Accepted Answer

34.5 lbs/hr

Answer

10 lbs/hr

Answer

15.65 lbs/hr

Answer

50 lbs/hr

Question 7

What does 'TDS' stand for in boiler water treatment, and why is it monitored?

Accepted Answer

Total Dissolved Solids; to prevent scale and foaming by controlling blowdown

Answer

Thermal Distribution System; to track heat losses

Answer

Timed Discharge Schedule; to automate blowdown intervals

Answer

Turbine Discharge Steam; to measure steam quality