OCP A Exam Review

Question 1

_____ lighting is particularly common in landscape applications where you might be burying wire underground.

Answer 1

Low voltage lighting

Question 2

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?

Answer 2

10 Ω

Question 3

Current flowing through a conductor produces a _____ around that conductor.

Answer 3

Small Magnetic field

Question 4

Electrical and communications cabling is normally installed when the building has been dried in. The term “dried-in” means that the _____.

Answer 4

Structure is weatherproofed

Question 5

If another person holds the base of a stepladder, it is safe to stand on the top step.

Answer 5

NO

Question 6

If there is a conflict between two codes or standards that apply to a job, the best approach is to _____.

Answer 6

apply the most demanding standard

Question 7

Ohm’s law defines the relationships of.

Answer 7

Voltage, current, resistance

Question 8

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 _____.

Answer 8

Third band

Question 9

Pneumatic tools get their power from _____.

Answer 9

Compressed air

Question 10

Powder-actuated fastening systems are used to _____.

Answer 10

Drive fasteners into hard surfaces

Question 11

Series 6 coaxial cable has a characteristic impedance of _____ ohms.

Answer 11

75 ohms

Question 12

Solving combination circuits includes a step in which you _____.

Answer 12

Simplify the circuit

Question 13

The best type of ladder to use around electrical equipment would be made of _____.

Answer 13

Non-conductive material (such as fiberglass)

Question 14

The formula for calculating the total resistance in a parallel circuit with three resistors is?

Answer 14

1 over 1/R1 + 1/R2 + 1/R3

Question 15

The formula for calculating the total resistance in a series circuit with three resistors is?

Answer 15

R total = R1 + R2 + R3

Question 16

The shielding of coaxial cables is used to _____ signals.

Answer 16

Protect against external interference and prevent signal leakage

Question 17

The symbols shown on a floor plan will normally show their _____ locations.

Answer 17

Relative or approximate

Question 18

The voltage in commercial AC power lines is normally given as a(n) _____ value.

Answer 18

RMS (Root Mean Square)

Question 19

“Thread pitch” is the distance between one thread and the next

Answer 19

True

Question 20

What is the value of a resistor with a color code of red, green, black, and gold?

Answer 20

25 Ω with a tolerance of ±5%

Question 21

When operating a power tool, it is important to always _____.

Answer 21

Wear appropriate personal protective equipment

Question 22

Which of the fatal four results in the most fatalities?

Answer 22

Falls

Question 23

What are the three rules for series circuits.

Answer 23

1. The current is the same at any point in the Circuit.
2. The total Resistance is the sum of the individual resistors.
3. The applied voltage is equal to the sum of the voltage drops across all the resistors.

Question 24

What are the three rules concerning parallel circuits.

Answer 24

1. The total current flow in the circuit is the sum of the currents through all of the branches; this is known as current cells.
2. The voltage drop across any branch of a parallel circuit is the same as the applied voltage.
3. The total resistance of a parallel circuit is always less than the lowest value resistor, or branch in the circuit.

Question 25

XLR connectors are most commonly used for _____ applications.

Answer 25

Audio and microphone