What do air-quality sensors measure? A) Temperature, velocity, ...

[jho37]

What do air-quality sensors measure?
 
  A) Temperature, velocity, and pressure B) CO2, enthalpy, and humidity
  C) Ozone and NOx levels D) O2 and NOx levels

Question 2

Because air-source heat pumps circulate less refrigerant at low ambient temperatures, the refrigerant not being used is stored:
 
  A) In the metering device.
  B) In a liquid receiver.
  C) In a suction accumulator or charge compensator.
  D) In the compressor crankcase.

[katieost]

Answer to Question 1

B

Answer to Question 2

C