CFESA Gas Equipment and Safety

Question 1

What is the minimum required gas pressure for most commercial natural gas cooking equipment at the manifold?

Accepted Answer

3.5 inches W.C.

Answer

Most commercial natural gas equipment requires a manifold pressure of 3.5 inches W.C. (water column) for proper burner operation.

Question 2

What is the correct manifold pressure for commercial LP (propane) gas equipment?

Accepted Answer

11 inches W.C.

Answer

LP gas commercial equipment typically operates at 11 inches W.C. manifold pressure, which is higher than natural gas due to propane's different combustion properties.

Question 3

A commercial range burner produces a yellow, lazy flame. The most likely cause is:

Accepted Answer

Insufficient primary air or gas pressure too high

Answer

A yellow, lazy flame indicates incomplete combustion caused by insufficient primary air or an excessively rich air-gas mixture.

Question 4

What device automatically shuts off the gas supply if the pilot flame is extinguished on commercial gas equipment?

Accepted Answer

Thermocouple or thermopile safety system

Answer

A thermocouple or thermopile generates a small electrical current when heated by the pilot flame, which holds open the safety gas valve.

Question 5

When checking for gas leaks on commercial equipment, technicians should use:

Accepted Answer

Electronic combustible gas detector or listed leak detection solution

Answer

An electronic combustible gas detector or listed leak detection solution (never an open flame) is safe and effective for locating gas leaks.

CFESA - Commercial Food Equipment Service Association Practice Test

CFESA - Commercial Food Equipment Service Association Practice Test

CFESA Gas Equipment and Safety