Mechanical Practice Exam Questions Answers (A+ graded 100% verified latest update)

Mechanical Practice Exam Questions Answers (A+ graded 100% verified latest update)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 does the yellow tipped flame on a gas furnace indicate? correct answer: Insufficient Primary Air When the heat pump capacity exactly matches heating loss during heat pump operation occurs? correct answer: Balance Point which is 70F What color should the flame on a gas furnace be? correct answer: Blue What shuts off the burners on a gas furnace when the output temperature is excessive? correct answer: Limit Switch A sound in the tub after flushing the toilet might be caused by correct answer: Toilet not resealing after flushing Whites the most common cause of a leaking faucet? correct answer: worn out washer What is a crown/trap weir? correct answer: An interior projection in the outlet side of the trap/to aid in maintaining the seal What are the components to a restroom toilet? correct answer: Flapper seal, ballcock, bowl, tank, valve,handle, fill tube What locations can an electric water heater be located? correct answer: Per manufacturers installation instruction Dryer flex duct line should be? correct answer: 6 ft not concealed/ 8 ft not concealed