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)
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
How is a voltmeter connected for taking a reading? - answer✔In parallel with the voltage to be
measured
A service company was blasted in a news article the employees were briefed in a company
meeting and the majority of them nothing was done wrong and supported the company. The
employees shown there were? - answer✔Loyal
The federal agency that oversees the transportation of pressurized cylinder is? - answer✔DOT
The dictionary defines an honest person as one who is free from fraud or deception, which of the
following will hold true? - answer✔An honest person is fair and their dealings with other people
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