Basic HVACR Principles Concepts

Question 1

In an​ electric-resistance heating​ system, electricity is used to heat​ _______.

Answer 1

coils of heavy wire

Question 2

Ventilation is the process of​ _____.

Answer 2

introducing fresh air into a building

Question 3

In a common residential​ forced-air furnace, heat is transferred from the​ ________.

Answer 3

heat exchangers to the air

Question 4

Systems that use water or steam as the primary​ heat-exchange medium are known as​ _____.

Answer 4

hydronic

Question 5

One way ventilation can be defined as a​ _____.

Answer 5

means of introducing outside air into a building to improve air quality

Question 6

What is the term for the introduction of fresh air into an enclosed space to improve air​ quality?

Answer 6

Ventilation

Question 7

The metal plates that transfer heat to air in a​ forced-air heating system form an assembly called a​ _____.

Answer 7

heat exchanger

Question 8

Water or steam is often used in heating systems as​ a(n) _____.

Answer 8

​heat-exchange medium

Question 9

In a hydronic heating​ system, the heat exchange medium is​ _____.

Answer 9

water

Question 10

Compared to the outdoor​ air, the refrigerant entering the condenser is​ _____.

Answer 10

warmer

Question 11

Which element of a mechanical refrigeration system creates the pressure differential necessary for refrigerant to​ flow?

Answer 11

Compressor

Question 12

The equipment that is able to extract heat from the outside air by reversing the refrigeration cycle is called​ a(n) _____.

Answer 12

heat pump

Question 13

Which component of a mechanical refrigeration system is a heat exchanger that transfers heat from the warm indoor air to the cold refrigerant running through​ it?

Answer 13

Evaporator

Question 14

The two heat exchangers in the mechanical refrigeration cycle are the​ _____.

Answer 14

evaporator and condenser

Question 15

The device that lowers the temperature of the refrigerant before it enters the evaporator is the​ _____.

Answer 15

expansion device

Question 16

In a typical mechanical refrigeration​ system, heat is transferred from the indoor air to the refrigerant at the​ _____.

Answer 16

evaporator

Question 17

Which element of a mechanical refrigeration system transfers heat from a refrigerant to air or water flowing over​ it, enabling the change of state from a vapor to a​ liquid?

Answer 17

Condenser

Question 18

What temperature divides air conditioning applications from​ refrigeration?

Answer 18

60 degrees°F ​(16 degrees°​C)

Question 19

The term mechanical refrigeration cycle refers to​ _____.

Answer 19

the process by which circulating refrigerant absorbs heat in one location and moves it to another location

Question 20

The growth of bacteria and other harmful organisms can be reduced or eliminated by​ _____.

Answer 20

ultraviolet​ (UV) light

Question 21

The expansion device in the mechanical refrigeration cycle​ _____.

Answer 21

lowers the refrigerant pressure entering the evaporator