HVAC R3-27

How many floors are unlisted, single wall metal chimney (connectors) permitted to pass through?

• 0
• 1
• 2
• 3

Commercial air-cooled outdoor units require about ___ of condenser air circulation per horsepower, and are considerably less expensive to operate than indoor units.

• 400 CFM
• 700 CFM
• 1,000 CFM
• 1,200 CFM

Unvented fuel-burning room heaters are NOT permitted in a group _____ occupancy.

• A
• F
• S
• U

The installation of dryer exhaust, of commercial clothes dryers, shall have ducts with a cleatance of AT LEAST ____ inches to combustible materials.

• 3 inches
• 1/2 inchh
• 12 inches
• 6 inches

Fuel gas pipe shall be marked at each end of each length indicating code compliance. However, what type of pipe shall NOT be used in exterior locations or underground?

• aluminum pipe
• steel pipe
• copper pipe
• wrought iron pipe

To prevent the passing of a large amount of oil throughout the system a special separator must be placed in. The line in which this oil separator must go is the ___.

• oil
• equalizer
• suction
• discharge

What is the effect on heat flow through insulation when the insulation thickness is doubled?

• heat flow is cut in half
• heat flow is reduced by one-fourth
• heat flow will double
• heat flow is reduced by one-third

Every portion of Type I hood shall have clearance from unprotected combustible construction of not less than

• 6 inches
• 12 inches
• 18 inches
• 24 inches

The main function of an electric defrost termination thermostat is to

• setr the amount of defrost time
• prevent evaporator overheating
• start the evaporator fan
• restart the compressor

What effect does rising temperature have on a container of saturated vapor and liquid refrigerant?

• has no effect
• saturated vapor volume decreases
• pressure increases
• liquid volume decreases