HVAC-PP Final Quiz

Choose the correct description for scroll compressors:

• There is less vibration than from a reciprocating compressor.
• Both scrolls remain stationary during operation.
• There are more moving parts than in reciprocating compressors.
• They are noisy.

When adjusting superheat setting with a thermal expansion valve, what effect does increasing the superheat have on the system?

• starves the evaporator
• floods the evaporator
• cools the evaporator
• none of the above

Heat exists down to absolute zero which is measured at a temperature of

• -400 degrees F
• -420 degrees F
• -440 degrees
• -460 degrees F

Return air openings for heating, ventilation and air-conditioning systems shall not be taken from a closet, bathroom, toilet room, kitchen, garage, boiler room, furnace room or unconditioned attic, however, a ___ is not prohibited.

• boiler room
• furnace room
• unconditioned attic
• bedroom

As outlet ____ the crankcase pressure regulator opens?

• As oulet pressure decreases
• As outlet pressure increases
• As oulet temperature decreases
• As outlet temperature increases

From the list below, select the BEST definition of a vibration absorber:

• It is recommended to compress the vibration absorber while installing
• The flexible absorber should be fastened to the unit or to a wall at the end pointing away from the vibration source
• Only one should be placed on line
• They should not be placed on compressor suction lines near the condenser

An adjustable V-pulley for a belt drive motor is moved FURTHER from the other flange. This change will widen the pulley giving the effect of a smaller diameter pulley. The fan speed will

• decrease
• increase
• double
• triple

Clear space above ground of the lowest portion of mechanical equipment suspended from a floor shall be AT LEAST ___ inches.

• 6
• 4
• 10
• 8

What instrument measures moisture in the air?

• manometer
• hygrometer
• pitot tube
• anemometer

What is any portion of a refrigerating system under condenser pressure?

• cooling system
• circulating system
• high side
• low side