HAC vocabulary quiz 22

What is the function of a thermostat in a heating or air conditioning system?

• To control the flow rate of refrigerant

• To open and close a circuit to indicate or terminate operation

• To measure the pressure exerted by vapor

• To measure the total heat energy in a substance

What does a thermistor do?

• Measures the velocity pressure in a moving fluid

• Controls the flow rate of refrigerant

• Measures the pressure in inches of water

• Varies its electrical resistance with temperature

What is the purpose of a vapor barrier in refrigeration?

• To measure the pressure exerted by vapor

• To control the flow rate of refrigerant

• To encase a wetted wick for temperature measurement

• To act as an impervious layer on the warm side of insulation

What is the definition of total pressure in a mixture of gases?

• The pressure capable of causing equivalent velocity in a moving fluid

• The sum of all partial pressures

• The pressure in inches of water

• The pressure exerted by vapor

What is wet bulb temperature measured with?

• A refrigerant control valve

• A bimetal actuated switch

• A water manometer

• A thermometer encased in a wetted wick