Question 1
What are the five basic components to any schematic?
CORRECT 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.
Question 2
What are the three basic types of wiring diagrams used in the HVACR trade?
CORRECT ANSWER
1. The ladder diagram
2. The pictorial diagram
3. The installation diagram
Question 3
Describe the characteristics of a ladder diagram
CORRECT ANSWER
1. Provides the most helpful information for electrical troubleshooting
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,2.The intention of the overall schematic is to show how the circuit functions not how it
actually looks.
Question 4
Describe the characteristics of a pictorial diagram
CORRECT 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.
Question 5
Describe the characteristics of an installation diagram
CORRECT 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
Question 6
What is a switch?
CORRECT 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
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,Question 7
What is a load?
CORRECT ANSWER
A load is a device that consumes power and converts it into some other form of energy
Question 8
Describe the side-by-side arrangement four wire diagrams
CORRECT 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.
Question 9
Describe the up and down schematic arrangement
CORRECT 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.
Question 10
What are the two basic configurations used in schematics?
CORRECT ANSWER
Side by side arrangement and up and down arrangement
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, Question 11
A particular right triangle that has two equal sides. This is a?
CORRECT ANSWER
45°- 45°-90°right triangle
Question 12
Which of the following is typically represented by the two lines on the sides of a diagram?
CORRECT ANSWER
Each leg of the line or low voltage power
Question 13
To change the direction of rotation of a three phase motor, it is necessary to?
CORRECT ANSWER
Reverse any two of the motor leads
Question 14
The overload protection of a 10a and ma inputs of a digital used in HVAC work are?
CORRECT ANSWER
Always the same
Question 15
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What are the five basic components to any schematic?
CORRECT 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.
Question 2
What are the three basic types of wiring diagrams used in the HVACR trade?
CORRECT ANSWER
1. The ladder diagram
2. The pictorial diagram
3. The installation diagram
Question 3
Describe the characteristics of a ladder diagram
CORRECT ANSWER
1. Provides the most helpful information for electrical troubleshooting
1
@THE STUDY VAULT
,2.The intention of the overall schematic is to show how the circuit functions not how it
actually looks.
Question 4
Describe the characteristics of a pictorial diagram
CORRECT 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.
Question 5
Describe the characteristics of an installation diagram
CORRECT 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
Question 6
What is a switch?
CORRECT 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
2
@THE STUDY VAULT
,Question 7
What is a load?
CORRECT ANSWER
A load is a device that consumes power and converts it into some other form of energy
Question 8
Describe the side-by-side arrangement four wire diagrams
CORRECT 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.
Question 9
Describe the up and down schematic arrangement
CORRECT 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.
Question 10
What are the two basic configurations used in schematics?
CORRECT ANSWER
Side by side arrangement and up and down arrangement
3
@THE STUDY VAULT
, Question 11
A particular right triangle that has two equal sides. This is a?
CORRECT ANSWER
45°- 45°-90°right triangle
Question 12
Which of the following is typically represented by the two lines on the sides of a diagram?
CORRECT ANSWER
Each leg of the line or low voltage power
Question 13
To change the direction of rotation of a three phase motor, it is necessary to?
CORRECT ANSWER
Reverse any two of the motor leads
Question 14
The overload protection of a 10a and ma inputs of a digital used in HVAC work are?
CORRECT ANSWER
Always the same
Question 15
4
@THE STUDY VAULT
