NATE CORE EXAM PRACTICE REVIEW 2026
TESTED QUESTIONS
◉ Describe the current flow for DC circuit: Answer: DC Current flow
is in one direction
◉ How much heat is created by 1 watt of power? Answer: 3.41 BTU
◉ According to ohms law one voltage to an electrical heating
element is increased by 10%, the current through the heating
elements does what? Answer: It increases by 10%
◉ A step down transformer has a turns of 5:1. Primary voltage is
115 V. The voltage drop by 4%. What will be the secondary voltage?
Answer: 22.08 V
* solution:
115 V / 5 = 23.00
23 x .04 = 0.92
23 - .92 = 22.08
◉ The input side of a step down transformer is also properly called
the? Answer: Primary side
,◉ A capacitor is often used to? Answer: Increase the starting to work
on some motors
◉ What happens to the amp draw as the static pressure increases in
a system with a constant airflow blower motor? Answer: amp draw
increases / decreases inversely with static
◉ On and energized circuit what voltage will a meter read across an
open switch? Answer: Source voltage
◉ A motor has two, four, six or eight poles. What effect does this
have on the motor? Answer: The more polls, the slower the motor
speed
◉ Which of the following is true of a tapped multi speed motor:
Answer: Changing the connected taps changes the CFM output of a
properly loaded motor
◉ Field installation wiring of 120 V and 240 V is typically shown on
a wiring diagram as? Answer: Broken heavy lines
◉ Capacitor start induction run (CSIR) motors use what method to
increase starting torque? Answer: A start capacitor and the start
relay wired in series with the start winding
, ◉ Motors above 5 hp that are used with belt driven fans are
typically? Answer: 240/460 3 O
◉ How was the crank case heater energized? Answer: It is only on if
the compressor contactor is De-energized
◉ What is the purpose of an RC component? Answer: It is a dual
capacitor used for the compressor and fan motors
◉ In most field wiring diagrams, the color coding of wiring remains
consistent. Which of the following is applicable? Answer: Color
coding is almost always used for low-voltage wiring
◉ Pictorial wiring diagrams typically show components__ Answer:
In their approximate positions in the equipment
◉ A ladder diagram is useful for? Answer: Troubleshooting a unit
◉ An analog VOM meter is an electrical meter that__ Answer:
Displays volts, ohms, or milliamperes on an analog scale
◉ A digital multi meter marked "auto-ranging" Will automatically
set itself for__ Answer: Reading take and range of values for all volts,
amps or ohms
TESTED QUESTIONS
◉ Describe the current flow for DC circuit: Answer: DC Current flow
is in one direction
◉ How much heat is created by 1 watt of power? Answer: 3.41 BTU
◉ According to ohms law one voltage to an electrical heating
element is increased by 10%, the current through the heating
elements does what? Answer: It increases by 10%
◉ A step down transformer has a turns of 5:1. Primary voltage is
115 V. The voltage drop by 4%. What will be the secondary voltage?
Answer: 22.08 V
* solution:
115 V / 5 = 23.00
23 x .04 = 0.92
23 - .92 = 22.08
◉ The input side of a step down transformer is also properly called
the? Answer: Primary side
,◉ A capacitor is often used to? Answer: Increase the starting to work
on some motors
◉ What happens to the amp draw as the static pressure increases in
a system with a constant airflow blower motor? Answer: amp draw
increases / decreases inversely with static
◉ On and energized circuit what voltage will a meter read across an
open switch? Answer: Source voltage
◉ A motor has two, four, six or eight poles. What effect does this
have on the motor? Answer: The more polls, the slower the motor
speed
◉ Which of the following is true of a tapped multi speed motor:
Answer: Changing the connected taps changes the CFM output of a
properly loaded motor
◉ Field installation wiring of 120 V and 240 V is typically shown on
a wiring diagram as? Answer: Broken heavy lines
◉ Capacitor start induction run (CSIR) motors use what method to
increase starting torque? Answer: A start capacitor and the start
relay wired in series with the start winding
, ◉ Motors above 5 hp that are used with belt driven fans are
typically? Answer: 240/460 3 O
◉ How was the crank case heater energized? Answer: It is only on if
the compressor contactor is De-energized
◉ What is the purpose of an RC component? Answer: It is a dual
capacitor used for the compressor and fan motors
◉ In most field wiring diagrams, the color coding of wiring remains
consistent. Which of the following is applicable? Answer: Color
coding is almost always used for low-voltage wiring
◉ Pictorial wiring diagrams typically show components__ Answer:
In their approximate positions in the equipment
◉ A ladder diagram is useful for? Answer: Troubleshooting a unit
◉ An analog VOM meter is an electrical meter that__ Answer:
Displays volts, ohms, or milliamperes on an analog scale
◉ A digital multi meter marked "auto-ranging" Will automatically
set itself for__ Answer: Reading take and range of values for all volts,
amps or ohms
