EETC Circuit Design & Troubleshooting 2

Question 1

A technician measures 0V across a load resistor in a series circuit. What is the most likely fault?

Accepted Answer

There is an open circuit upstream of the load

Answer

An open circuit upstream prevents current flow, resulting in 0V across the load (all voltage drops at the open point).

Question 2

Which filter topology uses an inductor in series and a capacitor in parallel to pass low frequencies?

Accepted Answer

Low-pass LC filter

Answer

A low-pass LC filter places the inductor in series (blocks high frequencies) and the capacitor in shunt (bypasses remaining high frequencies to ground).

Question 3

When troubleshooting a circuit with an oscilloscope, you observe a waveform with excessive ripple at the output of a rectifier. What component is most likely faulty?

Accepted Answer

The filter capacitor

Answer

A deteriorated or open filter capacitor cannot smooth the rectified waveform, causing excessive ripple voltage.

Question 4

What is the purpose of a snubber circuit placed across a relay coil?

Accepted Answer

To suppress voltage spikes caused by inductive kickback

Answer

When a relay coil de-energizes, its inductance produces a large reverse voltage spike; a snubber (RC or diode) clamps this transient.

Question 5

In a voltage divider circuit with R1=10kΩ and R2=10kΩ connected to 24V, what is the output voltage taken across R2?

Accepted Answer

12V

Answer

Equal resistors split the voltage equally: Vout = 24V × (10k/(10k+10k)) = 12V.

(EETC) Electrical Technician Certification Practice Test

(EETC) Electrical Technician Certification Practice Test

EETC Circuit Design & Troubleshooting 2