WALMART MAINTENANCE HVAC and Refrigeration 2

Question 1

What is a thermostat's role in an HVAC system?

Accepted Answer

To sense temperature and signal the HVAC system to turn on or off to maintain the setpoint

Answer

To generate heat or cold

Answer

To filter the air

Answer

To circulate refrigerant

Question 2

What is the purpose of preventive maintenance on rooftop HVAC units?

Accepted Answer

To extend equipment life, maintain efficiency, and prevent costly breakdowns

Answer

To void the warranty

Answer

To satisfy insurance requirements only

Answer

To keep the roof clean

Question 3

Why is proper airflow important in a walk-in cooler?

Accepted Answer

To ensure even temperature distribution and prevent hot spots that could cause food spoilage

Answer

To keep employees comfortable

Answer

To reduce noise levels

Answer

To prevent ice buildup on the floor only

Question 4

What is a Building Management System (BMS) used for?

Accepted Answer

Centrally monitoring and controlling HVAC, lighting, and other building systems

Answer

Managing employee schedules

Answer

Processing payroll

Answer

Ordering building supplies

Question 5

What causes ice to form on evaporator coils in a refrigeration system?

Accepted Answer

Restricted airflow, low refrigerant charge, or defrost system failure

Answer

Too much refrigerant

Answer

High ambient temperatures

Answer

Normal operation

Question 6

What is the recommended temperature range for a commercial walk-in freezer?

Accepted Answer

-10 to 0°F

Answer

28-32°F

Answer

0-10°F

Answer

-20 to -10°F