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

Ohm's Law states that Resistance (R) is equal to Voltage (E) divided by Current (I), or R = E/I. In this scenario, R = 120V / 1.5A, which equals 80 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

When resistors are connected in series, the total resistance is the sum of the individual resistances. Therefore, RT = R1 + R2 + R3 = 100Ω + 200Ω + 300Ω = 600Ω.

Question 3

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

Accepted Answer

Transistor

Answer

A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. It is a fundamental building block of modern electronics used in applications like amplifiers and digital circuits.

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

Kirchhoff's Current Law (KCL) is based on the conservation of charge and states that the algebraic sum of currents entering a junction must equal the algebraic sum of currents leaving that junction.

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

The formula for capacitive reactance is Xc = 1 / (2πfC). Plugging in the values: Xc = 1 / (2 * 3.14159 * 60Hz * 0.000010F), which calculates to approximately 265 Ohms.

(CBT) Certified Broadcast Technologist Practice Test

(CBT) Certified Broadcast Technologist Practice Test

CBT - Certified Broadcast Technologist Electronic Fundamentals Questions and Answers