CFESA Steam and Water Systems 5

Question 1

A technician notices white mineral scale buildup on a combi oven's steam generator heating element. Which corrective action is most appropriate?

Accepted Answer

Descale with an approved acidic descaling solution per manufacturer procedure

Answer

Mineral scale (limescale) insulates heating elements, reducing efficiency; descaling with an approved acidic cleaner dissolves carbonate deposits safely.

Question 2

Which water quality parameter most directly contributes to scale formation in steam-generating commercial equipment?

Accepted Answer

High total dissolved solids (TDS) and hardness

Answer

High water hardness (calcium and magnesium ions) combined with high TDS causes limescale to precipitate on heating surfaces when water is heated.

Question 3

A pressure-reducing valve (PRV) downstream of a steam boiler is hunting (fluctuating rapidly). What is the most likely cause?

Accepted Answer

An oversized PRV for the actual load demand

Answer

An oversized PRV operates near its minimum controllable range, causing rapid opening and closing (hunting) instead of smooth pressure regulation.

Question 4

When performing a hydrostatic pressure test on a repaired steam boiler jacket, the test pressure is typically set to:

Accepted Answer

1.5 times the MAWP

Answer

Standard hydrostatic test pressure for pressure vessels is 1.5 times the MAWP to verify structural integrity without exceeding safe limits.

Question 5

A convection steamer produces wet, soggy food even though it is operating at the correct temperature. What should the technician inspect?

Accepted Answer

Drain and condensate removal system for blockages

Answer

A blocked drain prevents condensate from escaping the cavity, causing excess moisture accumulation that results in wet, waterlogged food product.

CFESA - Commercial Food Equipment Service Association Practice Test

CFESA - Commercial Food Equipment Service Association Practice Test

CFESA Steam and Water Systems 5