Air Systems Cleaning Specialist Exam Questions

Here you have the best Nadca ASCS practice exam questions.

Some things you may want to keep in mind about this practice exam questions:

You have 40 total questions to study from
Each page has 5 questions, making a total of 8 pages
You can navigate through the pages using the buttons at the bottom
This questions were last updated on September 12, 2024

Question 1 of 40

According to ACR, The NADCA Standard, properly performed HVAC system cleaning services should:

A.

eliminate all contamination.

B.

restore the internal insulation to an “as new” condition.

C.

restore the evaporator coil to its original pressure drop.

D.

render the system visibly clean.

Correct Answer: D

According to the NADCA (National Air Duct Cleaners Association) Standard, properly performed HVAC system cleaning services should render the system visibly clean. This means that all the key components of the system should be free from visible dust and debris after cleaning. Ensuring visible cleanliness is a standardized measure of quality in HVAC cleaning services.

Question 2 of 40

Dirt streaks around supply diffusers that are NOT caused by a dirty ventilation system are MOST likely caused by:

A.

Slow discharge velocities.

B.

elevated relative humidity.

C.

dirty room air at the diffuser.

D.

thermal stratification around the diffuser.

Correct Answer: C

Dirt streaks around supply diffusers that are not caused by a dirty ventilation system are most likely caused by dirty room air at the diffuser. When the room air contains dust and other particles, these can accumulate around the diffuser as the air is discharged, leading to visible streaks.

Question 3 of 40

A package unit contains which of the following components?

A.

Compressor, evaporator coil, condenser, supply fan, and filter

B.

Evaporator coil, VAV box, condenser, supply fan, exhaust fan, and filter

C.

Compressor, hat water coil, condenser, supply fan, exhaust fan, and filter

D.

Compressor, evaporator coil, condenser, supply fan, thermostat, and filter

Correct Answer: D

A package unit typically contains a compressor, an evaporator coil, a condenser, a supply fan, a thermostat, and a filter. These components are essential for the functioning of a packaged HVAC system. Other options mentioning components such as a VAV box or an exhaust fan are not typical for standard package units.

Question 4 of 40

The MOST common types of fuel consumed in modern residential HVAC systems are:

A.

natural gas, propane, and oil

B.

electric, propane, and oil

C.

natural gas, methane, and oil

D.

natural gas, propane, and ethanol

Correct Answer: A

The most common types of fuel consumed in modern residential HVAC systems are natural gas, propane, and oil. These fuels are widely used for their efficiency and availability in residential heating and cooling systems.

Question 5 of 40

What type of supply fan transfers large volumes of air with a minimal wheel diameter?

A.

Backward-inclined fan

B.

Forward-curved fan

C.

Axial fan

D.

Radial fan

Correct Answer: B

A forward-curved fan is typically used for transferring large volumes of air with a minimal wheel diameter. These fans are capable of moving a significant amount of air at lower speeds and are commonly used in HVAC systems due to their efficiency in providing high airflow with low noise levels.