Question 1
On a packaged rooftop unit with an economizer, what condition allows the economizer to provide 'free cooling'?
Correct Answer:
Outdoor air is suitable (cool/dry enough) to satisfy cooling without running compressors
Question 2
A dry-bulb economizer uses a single outdoor sensor for changeover. Compared with an enthalpy economizer, the dry-bulb type can waste energy when outdoor air is:
Correct Answer:
Cool but very humid
Question 3
What is the purpose of the minimum-position setting on an economizer's outdoor-air damper?
Correct Answer:
To maintain a minimum amount of ventilation (outdoor) air while the fan runs
Question 4
Modern rooftop economizer controllers include Fault Detection and Diagnostics (FDD). A common FDD fault is:
Correct Answer:
Outdoor-air or return-air temperature sensor out of range / shorted
Question 5
On a gas/electric packaged rooftop unit, the 'gas' and 'electric' refer respectively to:
Correct Answer:
Gas heating and electric (mechanical) cooling
Question 1
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About this Exam

Prepare with the HVAC Excellence Master LC-AC Practice Questions - HVAC Excellence Master Specialist - Light Commercial Air Conditioning (Written Examination) Exam practice quiz. This question bank includes 100 questions covering rooftop, unit, economizer, control, and phase. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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HVAC Excellence Master LC-AC Practice Questions - HVAC Excellence Master Specialist - Light Commercial Air Conditioning (Written Examination) Exam

This practice set contains 100 questions from the matching question bank and focuses on rooftop, unit, economizer, control, and phase. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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