Preview Questions HVAC Technician | Role Specific Skill

Question 1: What should be done when an HVAC system is producing abnormal sounds during operation?

Which action should you take?

Choose only one option

Ignore the noise, as it is typically a normal part of system operation

Perform a detailed inspection of the fan, motor, and ductwork

Lubricate the thermostat

Increase the fan speed to compensate for the sound

Question 2: What is the maximum allowable refrigerant charge for a system under the ASHRAE 15 safety standard?

Which action should you take?

Choose only one option

50 lbs for all systems regardless of refrigerant type

100 lbs for all systems

No charge limit is specified by ASHRAE 15

It depends on the type of refrigerant and the room size, but calculations must ensure a safe charge

Question 3: How should a technician inspect the system's blower motor during preventative maintenance?

Which action should you take?

Choose only one option

By checking for noise while the system runs

By checking the compressor's RPM

By visually inspecting the motor for rust

By measuring the current draw on the motor

Question 4: How can you diagnose an HVAC system that is short-cycling?

Which action should you take?

Choose only one option

Check the thermostat settings, refrigerant levels, and airflow

Replace the compressor

Decrease the system's power supply

Clean the condenser coils

Question 5: What is the purpose of energy recovery wheels in HVAC systems?

Which action should you take?

Choose only one option

They provide extra heating capacity in the winter

They control humidity levels without affecting energy use

They transfer heat and moisture between incoming and outgoing air streams to improve efficiency

They increase the refrigerant charge for better cooling

Question 6: What is the purpose of the defrost cycle in an HVAC system, and how does it operate?

Which action should you take?

Choose only one option

It simply reduces system pressure to prevent freezing

It increases the system's airflow to clear ice buildup

It runs the fan continuously to improve heat exchange efficiency

It temporarily shuts down the compressor and reverses the refrigerant flow to clear ice from the evaporator coil