CBT Electronic & Electrical Fundamentals 2

Question 1

What is the impedance of a series RLC circuit at resonance?

Accepted Answer

Equal to the resistance only

Answer

At resonance, inductive and capacitive reactances cancel, leaving only the resistance as the circuit impedance.

Question 2

A transformer has a primary winding of 500 turns and a secondary of 100 turns. If the primary voltage is 120V, what is the secondary voltage?

Accepted Answer

24V

Answer

Using the turns ratio formula: Vs = Vp × (Ns/Np) = 120 × (100/500) = 24V.

Question 3

Which semiconductor device is typically used as a voltage regulator in simple circuits?

Accepted Answer

Zener diode

Answer

A Zener diode maintains a nearly constant voltage across its terminals when reverse-biased beyond its breakdown voltage.

Question 4

In a parallel RC circuit, what happens to total impedance as frequency increases?

Accepted Answer

Impedance decreases

Answer

As frequency rises, capacitive reactance decreases, reducing the overall parallel impedance of the RC circuit.

Question 5

What is the primary function of a bypass capacitor in an amplifier circuit?

Accepted Answer

Block DC while passing AC signals to ground

Answer

A bypass capacitor shorts AC signals to ground at a specific frequency, effectively removing the emitter resistor from the AC signal path to increase gain.

(CBT) Certified Broadcast Technologist Practice Test

(CBT) Certified Broadcast Technologist Practice Test

CBT Electronic & Electrical Fundamentals 2