Maintenance Test Question and Answers Flashcards

What is the recommended air filter replacement frequency for a commercial rooftop HVAC unit in a retail environment?

Answer: Every 30-90 days depending on conditions

Commercial HVAC filters in high-traffic retail environments should be checked monthly and replaced every 30-90 days.

When using a multimeter to check for voltage in a 120V outlet, between which points should you place the probes?

Answer: Hot (narrow slot) and neutral (wide slot) or hot and ground

Voltage is measured between the hot conductor and either neutral or ground to read the potential difference.

A belt-driven exhaust fan is making a squealing noise. What is the most probable cause?

Answer: The belt is loose, worn, or glazed

Squealing from belt-driven equipment typically indicates a loose, worn, or glazed belt that is slipping on the pulleys.

What is the purpose of a backflow preventer in a commercial plumbing system?

Answer: To prevent contaminated water from flowing back into the potable water supply

Backflow preventers protect the public water supply from contamination caused by pressure changes in the plumbing system.

During a routine inspection, you notice corrosion on the battery terminals of an emergency generator. What should you do?

Answer: Clean the terminals with a baking soda solution, apply anti-corrosion compound, and tighten connections

Battery terminal corrosion increases resistance, which can prevent the generator from starting when needed. Cleaning and protecting the terminals is routine maintenance.

What does the acronym PPM stand for in the context of maintenance scheduling?

Answer: Planned Preventive Maintenance

PPM stands for Planned Preventive Maintenance, a scheduled approach to maintaining equipment before failures occur.