OCP A Exam Review Flashcards
_____ lighting is particularly common in landscape applications where you might be burying wire underground.
Low voltage lighting
A three-branch parallel circuit has a total resistance of 10 Q. Two of the resistors are 70 Ω and 20 Ω. What is the value of the third resistor?
10 Ω
Current flowing through a conductor produces a _____ around that conductor.
Small Magnetic field
Electrical and communications cabling is normally installed when the building has been dried in. The term “dried-in” means that the _____.
Structure is weatherproofed
If another person holds the base of a stepladder, it is safe to stand on the top step.
NO
If there is a conflict between two codes or standards that apply to a job, the best approach is to _____.
apply the most demanding standard
Ohm’s law defines the relationships of.
Voltage, current, resistance
On a 4 Band Resistor, the color band that represents a power of ten, or the number of zeros to add to the value, is the _____.
Third band
Pneumatic tools get their power from _____.
Compressed air
Powder-actuated fastening systems are used to _____.
Drive fasteners into hard surfaces
Series 6 coaxial cable has a characteristic impedance of _____ ohms.
75 ohms
Solving combination circuits includes a step in which you _____.
Simplify the circuit
The best type of ladder to use around electrical equipment would be made of _____.
Non-conductive material (such as fiberglass)
The formula for calculating the total resistance in a parallel circuit with three resistors is?
1 over 1/R1 + 1/R2 + 1/R3
The formula for calculating the total resistance in a series circuit with three resistors is?
R total = R1 + R2 + R3
The shielding of coaxial cables is used to _____ signals.
Protect against external interference and prevent signal leakage
The symbols shown on a floor plan will normally show their _____ locations.
Relative or approximate
The voltage in commercial AC power lines is normally given as a(n) _____ value.
RMS (Root Mean Square)
“Thread pitch” is the distance between one thread and the next
True
What is the value of a resistor with a color code of red, green, black, and gold?
25 Ω with a tolerance of ±5%
When operating a power tool, it is important to always _____.
Wear appropriate personal protective equipment
Which of the fatal four results in the most fatalities?
Falls
What are the three rules for series circuits.
- The current is the same at any point in the Circuit.
- The total Resistance is the sum of the individual resistors.
- The applied voltage is equal to the sum of the voltage drops across all the resistors.
What are the three rules concerning parallel circuits.
- The total current flow in the circuit is the sum of the currents through all of the branches; this is known as current cells.
- The voltage drop across any branch of a parallel circuit is the same as the applied voltage.
- The total resistance of a parallel circuit is always less than the lowest value resistor, or branch in the circuit.
XLR connectors are most commonly used for _____ applications.
Audio and microphone
