ISCET Electronic Components & Circuit Analysis 5

Question 1

What is the primary difference between a JFETand a MOSFET?

Accepted Answer

MOSFETs have an insulated gate that draws virtually no gate current

Answer

MOSFETs have a metal-oxide insulating layer between the gate and channel, resulting in extremely high gate input impedance and negligible gate current.

Question 2

A transformer has 500 primary turns and 50 secondary turns. If the primary voltage is 120 V, what is the secondary voltage?

Accepted Answer

12 V

Answer

Turns ratio Ns/Np = Vs/Vp → Vs = 120 × (50/500) = 12 V; this is a 10:1 step-down transformer.

Question 3

In a series RLC circuit at resonance, which statement is true?

Accepted Answer

Inductive and capacitive reactances are equal and cancel

Answer

At resonance, XL = XC, so they cancel and the total impedance equals only the resistance R, maximizing current.

Question 4

The term 'breakdown voltage' for a capacitor refers to:

Accepted Answer

The maximum voltage before the dielectric fails

Answer

Breakdown voltage is the voltage at which the dielectric material permanently fails, allowing current to flow through the capacitor.

Question 5

What is the output waveform of a half-wave rectifier fed with a 60 Hz sine wave?

Accepted Answer

Pulsating DC at 60 Hz

Answer

A half-wave rectifier passes only one half-cycle per input cycle, producing pulsating DC at the same frequency as the input (60 Hz).

(ISCET) International Society of Certified Electronics Technicians Practice Test

(ISCET) International Society of Certified Electronics Technicians Practice Test

ISCET Electronic Components & Circuit Analysis 5