CBT - Certified Broadcast Technologist Electronic Fundamentals Questions and Answers

Question 1

A technician measures 120V across a circuit and 1.5A of current flowing through it. Using Ohm's Law, what is the resistance of the circuit?

Accepted Answer

80 Ohms

Answer

180 Ohms

Answer

0.0125 Ohms

Answer

121.5 Ohms

Question 2

In a broadcast facility, three resistors with values of 100Ω, 200Ω, and 300Ω are connected in series. What is the total resistance of this combination?

Accepted Answer

600Ω

Answer

54.5Ω

Answer

200Ω

Answer

1100Ω

Question 3

Which of the following electronic components is primarily used to amplify signals or act as an electronic switch?

Accepted Answer

Transistor

Answer

Capacitor

Answer

Resistor

Answer

Inductor

Question 4

According to Kirchhoff's Current Law (KCL), what is the relationship of currents at a junction (or node) in a circuit?

Accepted Answer

The total current leaving a junction is equal to the total current entering it.

Answer

The total current entering a junction is greater than the total current leaving it.

Answer

The algebraic sum of all voltages around a closed loop is zero.

Answer

The current is the same through all components in any circuit configuration.

Question 5

A technician is working on an AC circuit for a transmitter and needs to calculate the capacitive reactance (Xc) of a 10µF capacitor at a frequency of 60Hz. What is the approximate capacitive reactance?

Accepted Answer

265 Ohms

Answer

377 Ohms

Answer

1.67 Ohms

Answer

600 Ohms

Question 6

What is the primary function of a diode in an electronic circuit?

Accepted Answer

To allow current to flow in only one direction.

Answer

To store electrical energy in a magnetic field.

Answer

To resist the flow of current equally in both directions.

Answer

To amplify the input signal.