Deck 7: Heating, Ventilating, and Air Conditioning Systems

Question 1

In the vapor compression refrigeration cycle, the refrigerant is first __________ in the evaporator unit, then moved to the compressor and condenser units.

A)boiled
B)chilled
C)recirculated
D)vented

Answer 1

A

Question 2

The energy efficiency ratio (EER) of cooling equipment can be calculated by:

A)adding the amount of cooling achieved (Btu/hr) to the amount of energy used (watts drawn by the unit) to operate the system.
B)multiplying the amount of cooling achieved by the amount of energy used.
C)subtracting the amount of cooling achieved from the amount of energy used.
D)dividing the amount of cooling achieved by the amount of energy used.

Answer 2

D

Question 3

What is normally called "the temperature" of a guestroom is known in the HVAC industry as:

A)the wet bulb temperature.
B)the dew point temperature.
C)the adiabatic temperature.
D)the dry bulb temperature.

Answer 3

D

Question 4

Convection heat loss reduces body temperature by way of:

A)transferring heat from the body toward colder surfaces.
B)transferring heat by moving cooler air over the body.
C)perspiration transforming into a vapor.
D)lowering humidity level.

Question 5

The basic job of a thermostat is to:

A)regulate the flow of fuel to an HVAC unit.
B)signal to maintenance personnel when an HVAC unit is in need of maintenance or repair.
C)regulate the flow of intake air to an HVAC unit.
D)sense the temperature of the air at the thermostat and signal an HVAC unit to either turn on or turn off.

Question 6

Water is cooled in a cooling tower by a process of:

A)condensation.
B)evaporation.
C)compression.
D)osmosis.

Question 7

The concept known as thermal storage conserves energy by:

A)using stored ice and cold water for cooling during periods of high energy cost.
B)converting daytime heat and light to electricity through solar panels.
C)closing a section of a hotel and supplying conditioned air only to occupied areas.
D)shutting down the HVAC system during nighttime hours.

Question 8

The centralized HVAC system offering the greatest room temperature flexibility is the:

A)two-pipe system.
B)three-pipe system.
C)four-pipe system.
D)universal system.