NATE CORE EXAM|VERIFIED QUESTIONS AND CORRECT DETAILED
ANSWERS|RATED AND GRADED A+ NEW UPDATE| 2026/2027
What are the five basic components to any schematic? - ANSWER✔ 1. A power supply
2. A path for the power
3. A load or component that operates from the power.
4. A switch or component that interrupts the power to the load.
5. A legend or key that explains what the various symbols and abbreviations used in the schematic
mean.
What are the three basic types of wiring diagrams used in the HVACR trade? - ANSWER✔ 1. The
ladder diagram
2. The pictorial diagram
3. The installation diagram
Describe the characteristics of a ladder diagram - ANSWER✔ 1. Provides the most helpful information
for electrical troubleshooting
2.The intention of the overall schematic is to show how the circuit functions not how it actually looks.
Describe the characteristics of a pictorial diagram - ANSWER✔ 1. Usually includes drawings that more
closely resemble the components themselves rather than the symbols.
2. Provides the best indication of the actual positions of the components in the equipment or control
panel.
Describe the characteristics of an installation diagram - ANSWER✔ 1. Used primarily By the person
installing equipment
2. It normally only shows what the terminal board connections are and may or may not include any
internal wiring of the unit
3. Field wiring Generally represented as Dashed lines.
4. Thicker lines represent line voltage wiring(120/240 V)
5. Thin lines represent low-voltage control wiring
, What is a switch? - ANSWER✔ A switch is a device that interrupts power to the load. It may be
manually or automatically activated by pressure, temperature or it may be an electrically controlled
switch
What is a load? - ANSWER✔ A load is a device that consumes power and converts it into some other
form of energy
Describe the side-by-side arrangement four wire diagrams - ANSWER✔ Usually arranges motors and
other power consuming components on the right side of the diagram called the "load" side. The
switches and other controllers are placed on the left side of the diagram called the "line"side.
Describe the up and down schematic arrangement - ANSWER✔ This type of arrangement divides the
schematic in to high-voltage and low-voltage sections. Normally the high voltage section is placed on the
top and the low voltage is placed on the bottom of the diagram.
What are the two basic configurations used in schematics? - ANSWER✔ Side by side arrangement
and up and down arrangement
A particular right triangle that has two equal sides. This is a? - ANSWER✔ 45°- 45°-90°right triangle
Which of the following is typically represented by the two lines on the sides of a diagram? -
ANSWER✔ Each leg of the line or low voltage power
To change the direction of rotation of a three phase motor, it is necessary to? - ANSWER✔ Reverse
any two of the motor leads
The overload protection of a 10a and ma inputs of a digital used in HVAC work are? - ANSWER✔
Always the same
As a general rule, a continuity check using an ohmmeter shows continuity by a reading of? -
ANSWER✔ At zero or a specific resistance
ANSWERS|RATED AND GRADED A+ NEW UPDATE| 2026/2027
What are the five basic components to any schematic? - ANSWER✔ 1. A power supply
2. A path for the power
3. A load or component that operates from the power.
4. A switch or component that interrupts the power to the load.
5. A legend or key that explains what the various symbols and abbreviations used in the schematic
mean.
What are the three basic types of wiring diagrams used in the HVACR trade? - ANSWER✔ 1. The
ladder diagram
2. The pictorial diagram
3. The installation diagram
Describe the characteristics of a ladder diagram - ANSWER✔ 1. Provides the most helpful information
for electrical troubleshooting
2.The intention of the overall schematic is to show how the circuit functions not how it actually looks.
Describe the characteristics of a pictorial diagram - ANSWER✔ 1. Usually includes drawings that more
closely resemble the components themselves rather than the symbols.
2. Provides the best indication of the actual positions of the components in the equipment or control
panel.
Describe the characteristics of an installation diagram - ANSWER✔ 1. Used primarily By the person
installing equipment
2. It normally only shows what the terminal board connections are and may or may not include any
internal wiring of the unit
3. Field wiring Generally represented as Dashed lines.
4. Thicker lines represent line voltage wiring(120/240 V)
5. Thin lines represent low-voltage control wiring
, What is a switch? - ANSWER✔ A switch is a device that interrupts power to the load. It may be
manually or automatically activated by pressure, temperature or it may be an electrically controlled
switch
What is a load? - ANSWER✔ A load is a device that consumes power and converts it into some other
form of energy
Describe the side-by-side arrangement four wire diagrams - ANSWER✔ Usually arranges motors and
other power consuming components on the right side of the diagram called the "load" side. The
switches and other controllers are placed on the left side of the diagram called the "line"side.
Describe the up and down schematic arrangement - ANSWER✔ This type of arrangement divides the
schematic in to high-voltage and low-voltage sections. Normally the high voltage section is placed on the
top and the low voltage is placed on the bottom of the diagram.
What are the two basic configurations used in schematics? - ANSWER✔ Side by side arrangement
and up and down arrangement
A particular right triangle that has two equal sides. This is a? - ANSWER✔ 45°- 45°-90°right triangle
Which of the following is typically represented by the two lines on the sides of a diagram? -
ANSWER✔ Each leg of the line or low voltage power
To change the direction of rotation of a three phase motor, it is necessary to? - ANSWER✔ Reverse
any two of the motor leads
The overload protection of a 10a and ma inputs of a digital used in HVAC work are? - ANSWER✔
Always the same
As a general rule, a continuity check using an ohmmeter shows continuity by a reading of? -
ANSWER✔ At zero or a specific resistance
