AZ ROC C-58 CR-58 Evaporative Cooling & Ventilation Practice Questions - Arizona ROC C-58 CR-58 Evaporative Cooling and Ventilating Examination Exam - AZ ROC C-58 CR-58 Evaporative Cooling & Ventilation Practice Questions - Arizona ROC C-58 CR-58 Evaporative Cooling and Ventilating Examination Exam

Question 1

What is the primary operational mechanism of a direct evaporative cooling system operating in dry desert climates?

Passing outdoor air over wetted media, causing water to evaporate into sensible heat, reducing air dry-bulb temperature while increasing specific humidity. Circulating chilled water through a sealed closed coil without adding moisture to the supply airstream. Compressing vapor refrigerant to absorb latent heat from outdoor air before discharging it into the space. Utilizing chemical desiccants to absorb air moisture before passing the air through a secondary condenser coil.

Correct Answer:

Passing outdoor air over wetted media, causing water to evaporate into sensible heat, reducing air dry-bulb temperature while increasing specific humidity.

Question 2

When installing 12-inch thick rigid cellulose evaporative cooling media (CelDek), what is the maximum recommended face velocity to prevent water droplets from being entrained into the supply ductwork?

550 to 600 feet per minute (FPM) 250 to 300 feet per minute (FPM) 850 to 900 feet per minute (FPM) 1100 to 1200 feet per minute (FPM)

Correct Answer:

550 to 600 feet per minute (FPM)

Question 3

How does an indirect evaporative cooling stage differ from a direct evaporative cooling stage in a two-stage (IDEC) HVAC system?

The indirect stage cools primary supply air sensibly through a heat exchanger without adding moisture to the supply air. The indirect stage adds moisture directly to the supply air to achieve 100% relative humidity before entering the building. The indirect stage uses electric heating elements to pre-warm outdoor air before passing over aspen pads. The indirect stage relies on a mechanical compressor to chill water inside the sump basin.

Correct Answer:

The indirect stage cools primary supply air sensibly through a heat exchanger without adding moisture to the supply air.

Question 4

Why is a continuous water bleed-off assembly required on commercial evaporative cooler sumps operating in Arizona?

To drain mineral-concentrated water continuously, preventing dissolved scale (calcium/magnesium) from building up on media pads and sump walls. To maintain constant high water pressure inside the distribution spider header. To prevent the circulation pump motor from overheating by dumping excess water into the drain line. To dilute the incoming electrical charge of the water pump motor.

Correct Answer:

To drain mineral-concentrated water continuously, preventing dissolved scale (calcium/magnesium) from building up on media pads and sump walls.

Question 5

A commercial evaporative cooler delivers 10,000 CFM across 12-inch rigid cellulose media. Assuming a design requirement of 1.5 GPM of water flow per 1,000 CFM for thorough media flushing, what total pump flow rate is required?

15.0 GPM 7.5 GPM 22.5 GPM 30.0 GPM

Correct Answer:

15.0 GPM

Question 1

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Prepare with the AZ ROC C-58 CR-58 Evaporative Cooling & Ventilation Practice Questions - Arizona ROC C-58 CR-58 Evaporative Cooling and Ventilating Examination Exam practice quiz. This question bank includes 100 questions covering evaporative, cooler, commercial, cooling, and water. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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AZ ROC C-58 CR-58 Evaporative Cooling & Ventilation Practice Questions - Arizona ROC C-58 CR-58 Evaporative Cooling and Ventilating Examination Exam

This practice set contains 100 questions from the matching question bank and focuses on evaporative, cooler, commercial, cooling, and water. 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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AZ ROC C-58 CR-58 Evaporative Cooling & Ventilation Practice Questions - Arizona ROC C-58 CR-58 Evaporative Cooling and Ventilating Examination Exam

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