CFESA Repair Techniques 3

Question 1

When repairing a commercial walk-in cooler door that will not seal properly, which component should be inspected first?

Accepted Answer

The door gasket and cam-lift hinge adjustment

Answer

A worn or misaligned gasket and improper cam-lift hinge adjustment are the primary causes of poor door sealing on walk-in coolers.

Question 2

A commercial griddle has one heating zone that does not reach setpoint while adjacent zones operate normally. The most likely cause is:

Accepted Answer

A failed thermostat for that zone only

Answer

Independent zone thermostats control each section; failure of one thermostat causes only that zone to underperform while adjacent zones remain unaffected.

Question 3

Which repair method is recommended when re-seating a commercial refrigeration compressor to reduce vibration transmission?

Accepted Answer

Install rubber vibration isolators between the compressor feet and mounting bracket

Answer

Rubber vibration isolators absorb compressor vibration, preventing structural noise and fatigue cracks in refrigerant lines.

Question 4

A technician is repairing a commercial char-broiler where one burner section has a yellow, lifting flame. After ruling out gas pressure issues, what should be inspected?

Accepted Answer

The burner orifice for enlargement or debris blockage

Answer

A yellow or lifting flame on a single burner section typically indicates a blocked or damaged orifice affecting the air-to-gas mixture.

Question 5

When rebuilding a commercial high-pressure pump on a steam cleaning unit, which seal material is appropriate for use with high-temperature water?

Accepted Answer

EPDM or PTFE seals rated for high temperature and water service

Answer

EPDM and PTFE seals are specifically rated for high-temperature water service and resist degradation that would affect nitrile or neoprene.

CFESA - Commercial Food Equipment Service Association Practice Test

CFESA - Commercial Food Equipment Service Association Practice Test

CFESA Repair Techniques 3