CFESA Electrical and Mechanical Systems 3

Question 1

What does a megohmmeter (megger) test measure in commercial food equipment motors?

Accepted Answer

Insulation resistance between windings and motor frame

Answer

A megger applies high DC voltage to measure the insulation resistance of motor windings, detecting moisture or deterioration before full failure.

Question 2

In a belt-driven commercial mixer, excessive belt slippage under load is MOST likely caused by?

Accepted Answer

Incorrect belt tension or worn belt grooves on the pulleys

Answer

A loose or worn belt combined with worn pulley grooves reduces friction, causing the belt to slip when load increases.

Question 3

Which component in a commercial reach-in cooler's electrical circuit is designed to open the circuit if the current exceeds a rated value due to a fault?

Accepted Answer

Overload relay

Answer

An overload relay monitors motor current and opens the circuit if current exceeds the set threshold, protecting the motor from heat damage.

Question 4

A commercial convection oven's blower motor runs but the heating elements do not energize. The most likely electrical cause is?

Accepted Answer

An open high-limit thermostat or safety switch in the element circuit

Answer

Most convection ovens require the blower to run before elements energize, and a tripped high-limit or open safety switch in the element circuit prevents heating.

Question 5

When testing a start capacitor, a reading of zero ohms on an analog ohmmeter indicates?

Accepted Answer

The capacitor is shorted internally and must be replaced

Answer

A shorted capacitor shows zero (or very low) resistance because internal insulation has broken down, creating a direct path between plates.

CFESA - Commercial Food Equipment Service Association Practice Test

CFESA - Commercial Food Equipment Service Association Practice Test

CFESA Electrical and Mechanical Systems 3