NATE CORE PRACTICE EXAM SCRIPT 2026
QUESTIONS WITH SOLUTIONS GRADED A+
◉ Line Voltage Wiring Connection. Answer: Steps include OHMing
pigtails, homeowner power off, and hot leg connection.
◉ Grille vs. Register. Answer: Difference: Grille has air volume
control, register does not.
◉ Condensing Unit Mounting. Answer: Required in flood-prone
areas: Under an overhang eave.
◉ EAC Wiring. Answer: Operates when EAC switch is ON and blower
is running.
◉ Low Voltage Wiring. Answer: Typically color coded wire.
◉ Power Supply Disconnect. Answer: Must be accessible and within
sight of the condenser.
◉ SCFM Calculation. Answer: Standard CFM calculation based on
temperature difference.
, ◉ Line Voltage Fuse. Answer: Sized to protect conductors.
◉ Fuse Continuity Test. Answer: Tested by checking resistance with
power off.
◉ Motor Circuit Ampacity. Answer: For a 20-amp motor, MCA should
be 25 amps.
◉ CSCR Motor with Open Capacitor. Answer: May start but draws
higher current without the run capacitor.
◉ Manometer Pressure Reading. Answer: Expressed in inches of
water.
◉ Hard Start Kits Requirement. Answer: Typically required for
systems with reciprocating compressors.
◉ High-Pressure Limit Control. Answer: Installed to sense
compressor discharge line pressure.
◉ Isolation Collar Purpose. Answer: Used to reduce noise
transmission in ductwork.
QUESTIONS WITH SOLUTIONS GRADED A+
◉ Line Voltage Wiring Connection. Answer: Steps include OHMing
pigtails, homeowner power off, and hot leg connection.
◉ Grille vs. Register. Answer: Difference: Grille has air volume
control, register does not.
◉ Condensing Unit Mounting. Answer: Required in flood-prone
areas: Under an overhang eave.
◉ EAC Wiring. Answer: Operates when EAC switch is ON and blower
is running.
◉ Low Voltage Wiring. Answer: Typically color coded wire.
◉ Power Supply Disconnect. Answer: Must be accessible and within
sight of the condenser.
◉ SCFM Calculation. Answer: Standard CFM calculation based on
temperature difference.
, ◉ Line Voltage Fuse. Answer: Sized to protect conductors.
◉ Fuse Continuity Test. Answer: Tested by checking resistance with
power off.
◉ Motor Circuit Ampacity. Answer: For a 20-amp motor, MCA should
be 25 amps.
◉ CSCR Motor with Open Capacitor. Answer: May start but draws
higher current without the run capacitor.
◉ Manometer Pressure Reading. Answer: Expressed in inches of
water.
◉ Hard Start Kits Requirement. Answer: Typically required for
systems with reciprocating compressors.
◉ High-Pressure Limit Control. Answer: Installed to sense
compressor discharge line pressure.
◉ Isolation Collar Purpose. Answer: Used to reduce noise
transmission in ductwork.
