What is a sling psychrometer used to​ measure?

• Thermal conductivity

• Wet-bulb temperature

• Freezing point

• Boiling point

What kind of heating system heats water and circulates it through a​ structure?

• 
  A hydronic system

• A​ forced-air system

• An electric system

• A hydroelectric system

What component can be used in the piping of a hydronic heating system to allow a structure to have different temperatures in different​ rooms?

• A​ pressure-regulating valve

• A zone control valve

• A limit switch

• A makeup water valve

An electric furnace may contain a component that melts to open a circuit in case of overheating. This is called a​ _______.

• fuse

• circuit breaker

• ceramic insulator

• fusible link

Which type of furnace is used in attics or crawl spaces where the height of the furnace must be kept to a​ minimum?

• Upflow furnace

• Lowboy furnace

• Horizontal furnace

• Condensing furnace

How can technicians help prevent damage to a masonry chimney from the water vapor in flue​ gases?

• By adding a drain

• By increasing the chimney size

• By installing a liner

• By adding a PVC pipe

The two elements that all fuels have in common are carbon and​ _____.

• oxygen

• hydrogen

• aldehyde

• helium

What is the boiling point of water on the Fahrenheit​ scale?

• 100degrees°F

  ​(37.8degrees°​C)

• 
  0degrees°

  F

  ​(-17.8degrees°​C)

• 212degrees°F

  ​(100degrees°​C)

• 32degrees°F

  ​(0degrees°​C)

Which compound is an​ odorless, tasteless,​ colorless, non-irritating, toxic gas resulting from incomplete​ combustion?

• CO2

• CO

• O2

• H2O

The transfer of heat through space by electromagnetic waves is known as​ _____.

• conduction

• convection

• radiation

• condensation