Exam (elaborations)
NATE Heat Pumps – Questions & Solutions
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NATE Heat Pumps – Questions & Solutions
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NATE Heat Pumps – Questions & Solutionsvoltage is ✔️Ans - electrical pressure
current flow must have a ✔️Ans - power source, path, and load
ohms law ✔️Ans - E = I x R
inductive electricity is ✔️Ans - Anything that moves, motors, solenoid
resistive current is ✔️Ans - a heater coil
DC current flows in ✔️Ans - one direction
voltage from a battery can be compared to ✔️Ans - pressure from a water
pump
transformers are rated in ✔️Ans - volt amps
a 24 volt, 40 volt amps transformer is rated for ✔️Ans - 1.6666 amps
motors are grounded to ✔️Ans - take away voltage potential
ladder diagrams are useful for ✔️Ans - troubleshooting
low voltage wiring is normally ✔️Ans - color coded
to change the rotation of a three phase motor ✔️Ans - reverse the
connection of any two terminals
pictorial wiring diagrams generally show components in their ✔️Ans -
approximate position in the equipment
power is measured in ✔️Ans - watts
volt meters read a potential difference and the leads are placed ✔️Ans -
parallel across the load
, 5 horsepower motors are larger and typically ✔️Ans - 240/460 r belt
driven
changing fan speeds will change the ✔️Ans - CFMs on a properly loaded
motor
when checking windings on an energized compressor, your meter will be in
✔️Ans - volts
de-energized compressor will be in ✔️Ans - ohms
if you read voltage across a relay or contactor that is energized ✔️Ans -
they are burnt or pitted
the first checks on a control board are ✔️Ans - input signals and output
voltages
a continuity check shows continuity by reading ✔️Ans - zero ohms or some
specific reading
alternating current has current flow that ✔️Ans - reverses direction as the
voltage goes through a positive/negative change
one pound of water is about ✔️Ans - one pint
comfort depends on ✔️Ans - dry bulb, wet bulb, and air velocity
as static pressure increases ✔️Ans - amp draw decreases
low side gauge is the ✔️Ans - compound gauge. it reads below and above
atmospheric pressure
atmospheric pressure = ✔️Ans - 14.7 psia or 0 psig
three angles of a triangle always add up to ✔️Ans - 180 degrees
supply duct leaks put the structure into a ✔️Ans - negative pressure
return duct leaks put the structure into a ✔️Ans - positive pressure
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