Unit 47 Review

The refrigerated cabinet temperature of a high-temperature refrigeration unit ranges from ____.

• 25°F to 45°F

• 45°F to 60°F

• 60°F to 75°F

• 75°F to 95°F

In a high-temperature refrigeration unit, the boiling point of the refrigerant in the coil is normally ____ lower than the cabinet temperature.

• 5°F to 15°F

• 10°F to 20°F

• 25°F to 35°F

• 35°F to 46°F

Medium-temperature refrigerated cabinet temperatures range from ____.

• 5°F to 20°F

• 20°F to 35°F

• 30°F to 45°F

• 35°F to 50°F

The process of ice making usually occurs in which temperature range?

• 0°C to 4°C

• -1°C to 0°C

• -2°C to 0°C

• -10°C to -5°C

What is the typical evaporator temperature range for low-temperature applications?

• -10°F to 0°F

• 0°F to 5°F

• 5°F to 20°F

• 20°F to 30°F

Condensing units located outside that are required to operate year-round must have ____.

• larger fan motors

• CPR valves

• all weather protection

• head pressure control

With the entering air to the condenser above 70°F, the temperature difference between the outdoor air and the condensing temperature on standard units will be ____.

• 10°F to 15°F

• 15°F to 20°F

• 20°F to 25°F

• 25°F to 30°F

Calculating the Correct Head Pressure for Air-cooled Equipment: Which of the above is correct?

• high side 136 psig, low side 25 psig

• high side 100 psig, low side 15 psig

• high side 200 psig, low side 20 psig

• high side 180 psig, low side 35 psig

In a wastewater system, the water entering the condenser is 85°F and the water leaving the condenser is 105°F. Which of the following statements is a logical explanation for the above conditions?

• reduced water flow through the condenser

• scale buildup in the water circuit

• excess water flow through the condenser

• both a and b

In a wastewater system, the water entering the condenser is 85°F and the water leaving the condenser is 90°F. Which of the following statements is a logical explanation for the above conditions?

• reduced water flow through the condenser

• water regulating valve stuck in the wide-open position

• excess water flow through the condenser

• both b and c