A post-condenser loop is also known as a(n) _____ loop.

Chapter 40

1. When a heat pump switches from heating to cooling mode, ______.

a. The blower fan reverses

b. The outdoor fan turns off

c. Refrigerant flow through the compressor reverses

d. Refrigerant flow through the system reverses

2. When a heat pump is operating in heating mode, the outdoor coil _____.

a. Functions as a condenser

b. Functions as an evaporator

c. Functions as a metering device

d. Is disabled

3. In a heat pump, the direction of refrigerant flow through its compressor _____.

a. Changes direction based on the reversing valve

b. Is always in the same direction

c. Reverses in colling mode

d. Reverses in heating mode

4. The two main types of air-source heat pumps are ______ heat pumps.

a. Air-to-air and air-to-water

b. Direction-exchange and air-to-water

c. Water-source and air-to-air

d. Water-source and direct-exchange

5. Which of the following statements about air-source heat pumps is true?

a. As outdoor temperature decreases, the heating mode becomes less efficient

b. The reversing valve changes the direction of airflow through a building

c. When the heat pump is in cooling mode, the indoor coil serves as a condenser

d. When the heat pump is in cooling mode, the indoor coil serves as a evaporator

6. A(n) _____ heat pump uses a water coil to transfer heat between the refrigerant and the ground or water loop.

a. Air-source

b. Air-to-water

c. Direct-exchange

d. Water-source

7. In a direct-exchange heat pump, _____.

a. Refrigerant circulates through a copper coil buried in the ground

b. Water in a ground loop absorbs heat and transfers it to the system through a water coil

c. A well or late serves as both the supply and discharge source for the system

d. None of the above

8. The amount of liquid refrigerant in a charge compensator tank is affected vy the temperature of the ______, which funs

through the center of the tank but does not open inside it.

a. Accumulator line

b. Gas line

c. Liquid line

d. Reversing valve

9. A crankcase heater helps protect a heat pump compressor from _____.

a. Current overloads

b. Overheating

c. Migration of liquid refrigerant during the Off cycle

d. All of the above

10. In a heat pump system with two thermostatic expansion valves, a _____ is installed in tubing parallel to the TXVs to

allow refrigerant to flow in both directions.

a. Biflow TXV

b. Capillary tube

c. Check valve

d. Flow check

11. A biflow thermostatic expansion valve ______.

a. Allows refrigerant flow in either direction