During the initial startup of a geothermal water source heat pump, when should the water flow be ...

During the initial startup of a geothermal water source heat pump, when should the water flow be checked and adjusted?
 
  A) after checking the system refrigerant pressures and amp draw
  B) after operating the unit for at least 15 minutes
  C) first, before operating the system
  D) after making sure the refrigerant charge and airflow are correct

 Q. 2

The two main types of fan drives are
 
  A) Serpentine belt and chain drive B) Magnetic drive and hydrodrive
  C) Planetary gear drive and worm gear drive D) Direct drive and belt drive

 Q. 3

The advantage of the backward curved centrifugal fan over the forward curved centrifugal fan is that
 
  A) backward curved fans are normally quieter in operation
  B) backward curved fans are non-overloading
  C) backward curved fans operate at lower RPMs
  D) backward curved centrifugal fans are well suited for small airflow quantities