08. ACR-104 UNIT 22 EOU TEST

The refrigerant in a condenser in a refrigeration system ____.

• absorbs heat

• rejects heat

• changes to a vapor

• is under lower pressure than the evaporator

The condenser in a refrigeration system ____.

• desuperheats the vapor from the compressor

• condenses the vapor from the compressor

• subcools the liquid refrigerant before it leaves the condenser

• All of the above.

A normally operating water-cooled condenser is operating with a 10°F differential between water in and water out. If scale forms on the water tubes and the entering water is 85°F, which of the following is possible?

• The outlet water temperature will be lower than expected.

• The system head pressure will rise.

• The water regulating valve will close.

• Both a and b are correct.

Mineral deposits on the water side of a water-cooled condenser act as a(n) ____.

• conductor of heat

• insulator

• cleaning solution

• They have no effect on the operation of the condenser.

In a water-cooled condenser with dirty condenser tubes, the temperature difference between the refrigerant and the leaving water will be ____ when the tubes are clean.

• less than

• greater than

• the same as

• slightly lower than

The water circuit in shell-and-coil and tube-within-a-tube coil condensers must be cleaned ____.

• by removing the end caps

• with a brush

• chemically

• by air pressure

The shell-and-tube condenser is cleaned ____.

• with a brush after removing the end caps

• only with chemicals

• with compressed air

• with a vacuum cleaner

In a water-cooled condenser, a regulating valve is used to control the ____.

• refrigerant flow through the pressure reducing device

• refrigerant head pressure

• suction pressure

• water temperature

What can be used to maintain the head pressure of a system with a water-cooled condenser?

• Fan cycling.

• Dampers or louvers.

• Water regulating valve.

• All of the above.

The typical design temperature for the water entering a recirculating water system condenser is 85°F, and most systems have a ____ rise across the condenser.

• 1°F

• 5°F

• 10°F

• 15°F