CAR Troubleshooting & Diagnostics 2

Question 1

A refrigerator compressor runs continuously but the unit never reaches set temperature. What is the MOST likely cause?

Accepted Answer

Refrigerant leak reducing system pressure

Answer

A refrigerant leak lowers system pressure, reducing the refrigerant's ability to absorb heat, so the compressor runs constantly without achieving proper cooling.

Question 2

When diagnosing a washing machine that vibrates excessively during the spin cycle, which component should be inspected first?

Accepted Answer

Drum bearing or shock absorbers

Answer

Worn drum bearings or failed shock absorbers allow the drum to move erratically during high-speed spin, causing excessive vibration.

Question 3

A dryer heats normally but clothes remain damp after a full cycle. Which diagnostic step is MOST appropriate?

Accepted Answer

Check and clean the exhaust vent for blockages

Answer

A blocked exhaust vent traps moist air inside the drum, preventing evaporation and leaving clothes damp despite normal heat output.

Question 4

Which instrument is used to measure insulation resistance in a motor winding to detect breakdown?

Accepted Answer

Megohmmeter (Megger)

Answer

A megohmmeter applies high voltage to measure insulation resistance in megaohms, revealing deterioration or breakdown in motor windings.

Question 5

A dishwasher fills with water but the wash arms do not spray. What is the MOST likely fault?

Accepted Answer

Blocked or clogged spray arm ports

Answer

Clogged spray arm ports restrict water flow, preventing the rotation and spray action needed to clean dishes.

(CAR) Certified Appliance Recycler Practice Test

(CAR) Certified Appliance Recycler Practice Test

CAR Troubleshooting & Diagnostics 2