CFESA Steam and Water Systems 4

Question 1

A steam kettle is producing a hammering noise during heat-up. What is the most likely cause?

Accepted Answer

Water hammer from condensate trapped in steam lines

Answer

Water hammer occurs when condensate accumulates in steam lines and is struck by high-velocity steam, producing a hammering or banging noise.

Question 2

What does a float-and-thermostatic (F&T) steam trap do when fully submerged in condensate?

Accepted Answer

Opens the valve to discharge condensate

Answer

When the float in an F&T trap rises due to condensate accumulation, it opens the valve to discharge the condensate through the trap.

Question 3

Which type of water treatment chemical is used to prevent pitting corrosion caused by dissolved oxygen in boiler feedwater?

Accepted Answer

Oxygen scavenger

Answer

Oxygen scavengers such as sodium sulfite or hydrazine chemically react with dissolved oxygen to prevent pitting corrosion in boiler systems.

Question 4

A commercial steamer's water level sight glass shows water but the unit trips on low-water cutoff. What should the technician check first?

Accepted Answer

Sight glass for blockage or false reading

Answer

A clogged or vapor-locked sight glass can show a false water level; the actual boiler water level may be lower than indicated.

Question 5

What is the purpose of a backflow preventer installed on the cold-water supply to a steam boiler?

Accepted Answer

To prevent boiler water from contaminating the potable water supply

Answer

A backflow preventer stops potentially contaminated boiler water from siphoning back into the municipal potable water system.

CFESA - Commercial Food Equipment Service Association Practice Test