How is a velometer used to determine the CFM at a supply register?
A) The average air velocity is multiplied by the free area of the register.
B) The average air velocity is the same thing as CFM.
C) The average air velocity is multiplied by the face area of the register.
D) The average air velocity is multiplied by 1.08.
Question 2
What should a technician do if called to work on an oil burner with a tripped safety reset?
A) Push the reset button and closely observe the ignition sequence.
B) Replace the cad cell.
C) Replace the oil burner primary control.
D) Check the combustion chamber for unburned oil.
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