Unit 29 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?

• -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 ____.

• EPR valves

• head pressure control

• all weather protection

• large fan motors

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

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 cooled system, the difference between the condensing temperature of the refrigerant and the leaving water temperature is approximately ____.

• 10°F

• 20°F

• 30°F

• 40°F

In a water-cooled condensing unit/cooling tower combination, the temperature difference of the water through the condenser will be approximately ____.

• 10°F

• 20°F

• 30°F

• 40°F

A thermostatic expansion valve's capacity will drop if the pressure drop across the valve increases.

• True

• False