ISCET Component-Level Troubleshooting 5

Question 1

A ceramic disc capacitor reads zero ohms on an ohmmeter. What does this indicate?

Accepted Answer

The capacitor is shorted

Answer

A zero-ohm reading on a non-electrolytic capacitor indicates a short circuit, as these capacitors should read very high or infinite resistance.

Question 2

Which in-circuit test method introduces a known-good signal at each stage to verify signal flow?

Accepted Answer

Signal injection

Answer

Signal injection introduces an external test signal at each stage input, allowing the technician to confirm signal flow forward through the circuit.

Question 3

A transistor amplifier has correct DC bias voltages but distorts the output signal. The most likely cause is:

Accepted Answer

Transistor operating outside its linear active region

Answer

If DC bias is correct but the output is distorted, the transistor is likely being driven into saturation or cutoff by the AC signal, indicating improper AC load line operation.

Question 4

What is the expected DMM reading across a good fuse in a powered circuit?

Accepted Answer

0 V (zero volts)

Answer

A good fuse has very low resistance, so essentially no voltage drops across it in a powered circuit; a blown fuse would show full supply voltage.

Question 5

An inductor measures significantly lower resistance than specified. What fault is most likely?

Accepted Answer

Shorted turns within the winding

Answer

Shorted turns bypass portions of the winding, reducing the total DC resistance below its normal value.

(ISCET) International Society of Certified Electronics Technicians Practice Test

(ISCET) International Society of Certified Electronics Technicians Practice Test

ISCET Component-Level Troubleshooting 5