CFESA Gas Equipment and Safety 5

Question 1

A commercial steamer is connected to a 3/4-inch gas supply line. The installer wants to verify adequate gas flow. Which tool measures actual flow in cubic feet per hour?

Accepted Answer

Rotameter or in-line gas meter

Answer

A rotameter or calibrated in-line gas meter directly measures volumetric gas flow rate in cubic feet per hour.

Question 2

During commissioning of a new gas convection oven, the CO reading in the flue gases is 800 ppm air-free. What action is required?

Accepted Answer

Shut down the appliance immediately and do not operate until repaired

Answer

CO readings above 400 ppm air-free in flue gases indicate dangerous incomplete combustion; the appliance must be shut down and repaired before use.

Question 3

What is the purpose of a drip leg (dirt pocket) installed on a gas supply line to commercial equipment?

Accepted Answer

To trap condensate, scale, and debris before they reach the gas valve

Answer

A drip leg is a vertical pocket in the gas line that allows heavier contaminants and condensate to fall out before reaching sensitive gas valve components.

Question 4

A technician is replacing a gas valve on a commercial griddle. After completing the repair, what is the correct sequence before returning the unit to service?

Accepted Answer

Purge the line, light the pilot, check for leaks, verify flame appearance

Answer

The correct sequence is to purge trapped air, establish the pilot, leak-test all connections, and then verify proper burner flame characteristics.

Question 5

Which type of gas pressure regulator maintains constant outlet pressure regardless of fluctuating inlet pressure within its rated range?

Accepted Answer

Line pressure regulator

Answer

A line pressure regulator (also called a service pressure regulator) is designed to deliver a steady outlet pressure despite varying upstream supply pressure.

CFESA - Commercial Food Equipment Service Association Practice Test

CFESA - Commercial Food Equipment Service Association Practice Test

CFESA Gas Equipment and Safety 5