Mechanical Practice test
What turns off the gas if there is a problem at a water heater and/or gas furnace? - correct answer
Thermocouple
Where is the only place cross connection is allowed/acceptable? - correct answer On the Brine Line of a water
ionization system
Appliance fuel connectors shall have a maximum overall length of - correct answer 6 feet
A water temperature limiting device shall be provided to limit the hot water supplied bathtub or whirl pool
bathtub to a maximum of - correct answer 120 F
The total fall in a fixture drain due to pipe slope is limited to a maximum of - correct answer One pipe diameter
Where a fixture is separately trapped what is the maximum vertical distance permitted fixture outlet to the
trap weir? - correct answer 24 inches
What chimney part prevents moisture from entering between the brick and the flue? - correct answer Chimney
cap/crown
Soot on a gas water heater door indicates: - correct answer Improper combustion (spillage)
Type B vent and hood must be a minimum of how many feet from the end of the vent? - correct answer 2 feet
from the highest penetration
, P-Trap cannot be greater than_____from the bottom of a lavatory basin or sink - correct answer 24''
Atmospheric vacuum breakers: - correct answer Prevent back flow
What minimum clearance from side &bottom of an openable window to forced fan vent gas appliance? -
correct answer 4'-4'
What is a typical problem with a gas hot water heater supply valve? - correct answer Carbon Build up
What is the appropriate temperature difference between return and supply A/c? - correct answer 15-20 Delta-
T
Gas lines enter a room with a water heater and furnace. Where should the shut off valve be located? - correct
answer At each appliance
Gas dryer supply line is not being used. Check: - correct answer Gas line is capped
Incomplete combustion of natural gas produces: - correct answer Carbon Monoxide; Life expectancy is 6 years
Using a mirror and flashlight to view the heat exchanger on a gas furnace allows you to see - correct answer Les
than 20% of the heat exchanger
The vent connector should slope: - correct answer Upward going away from the furnace at minimum quarter
inch per foot
How much should a belt deflect when it is under proper tension? - correct answer About an inch
What is required to be checked on air conditioning system? - correct answer Temperature Differential
What turns off the gas if there is a problem at a water heater and/or gas furnace? - correct answer
Thermocouple
Where is the only place cross connection is allowed/acceptable? - correct answer On the Brine Line of a water
ionization system
Appliance fuel connectors shall have a maximum overall length of - correct answer 6 feet
A water temperature limiting device shall be provided to limit the hot water supplied bathtub or whirl pool
bathtub to a maximum of - correct answer 120 F
The total fall in a fixture drain due to pipe slope is limited to a maximum of - correct answer One pipe diameter
Where a fixture is separately trapped what is the maximum vertical distance permitted fixture outlet to the
trap weir? - correct answer 24 inches
What chimney part prevents moisture from entering between the brick and the flue? - correct answer Chimney
cap/crown
Soot on a gas water heater door indicates: - correct answer Improper combustion (spillage)
Type B vent and hood must be a minimum of how many feet from the end of the vent? - correct answer 2 feet
from the highest penetration
, P-Trap cannot be greater than_____from the bottom of a lavatory basin or sink - correct answer 24''
Atmospheric vacuum breakers: - correct answer Prevent back flow
What minimum clearance from side &bottom of an openable window to forced fan vent gas appliance? -
correct answer 4'-4'
What is a typical problem with a gas hot water heater supply valve? - correct answer Carbon Build up
What is the appropriate temperature difference between return and supply A/c? - correct answer 15-20 Delta-
T
Gas lines enter a room with a water heater and furnace. Where should the shut off valve be located? - correct
answer At each appliance
Gas dryer supply line is not being used. Check: - correct answer Gas line is capped
Incomplete combustion of natural gas produces: - correct answer Carbon Monoxide; Life expectancy is 6 years
Using a mirror and flashlight to view the heat exchanger on a gas furnace allows you to see - correct answer Les
than 20% of the heat exchanger
The vent connector should slope: - correct answer Upward going away from the furnace at minimum quarter
inch per foot
How much should a belt deflect when it is under proper tension? - correct answer About an inch
What is required to be checked on air conditioning system? - correct answer Temperature Differential
