Heating 3

In a heating systems where heat transfer takes place as warm air rises and cold air falls represents _____.

• convection

• transference

• conduction

• radiation

During the summer the body loses heat less rapidly when the humidity is _____.

• low

• high

• non-existent

• consistent

What must be present for combustion to occur _____.

• fuel, C02, and ignition

• radiation, conduction, and convection

• fuel, oxygen, and aldehydes

• fuel, ignition, and oxygen

Generally incomplete combustion result from _____.

• too much hydrogen

• lack of carbon monoxide

• a lack of oxygen

• an excess of carbon dioxide

When an induce-draft gas burner produces a flame that is blue, or blue with slight yellow tips, it is an indicator of _____.

• incomplete combustion

• normal operation

• too much primary air

• too much secondary air

A multipoise furnace is going to come configured like an _____.

• Upflow

• Downflow

• Horizontal

• Low-Boy

What is the component in a natural gas furnace that can vary the gas flow through the burner?

• an automatic gas valve

• a variable-speed inducer fan

• LP Gas

• a modulating gas valve

What condition would you expect to find if the flames lift off the burner surface?

• too much primary air

• too little primary air

• too much secondary air

• too little secondary air

For pilot safety flame rectification is used on _____.

• HSI

• intermittent ignition systems

• an automatic gas valve

• a standing polit

Mounted in or above the heat exchanger of a gas furnace the high-temperature limit switch is mounted and will open the circuit when _____.

• a flame roll-out occurs

• the indoor temperature exceeds 75 degrees F

• there is too much combustion air

• the indoor blower fails to operate