The ductwork connections for a rooftop packaged unit are typically :

The ductwork connections for a rooftop packaged unit are typically
 
  A) on the side of the unit
  B) not used because they do not connect to ductwork
  C) on the top of the unit
  D) on the bottom of the unit

 Q. 2

Freezers that use liquid nitrogen to freeze food quickly are known as:
 
  A) Blast freezers. B) Conduction freezers.
  C) Immersion freezers. D) Cryogenic freezers.

 Q. 3

Large rooftop package AC units often use ________ sensors to help draw in fresh air to meet code requirements and to cool if temperature and humidity permit.
 
  A) Enthalpy B) Low pressure C) Economizer D) Airflow