ISCET Component-Level Troubleshooting 2

Question 1

A technician measures voltage across a diode in forward bias and reads 0 V. What is the most likely fault?

Accepted Answer

Diode is shorted

Answer

Diode is open

Answer

Diode is correctly biased

Answer

Supply voltage is too high

Question 2

When testing a capacitor with an ohmmeter, the needle deflects then slowly returns to infinity. This indicates the capacitor is:

Accepted Answer

Functional

Answer

Shorted

Answer

Open

Answer

Leaky

Question 3

Which instrument is best suited for checking the switching speed of a transistor in a digital circuit?

Accepted Answer

Oscilloscope

Answer

Digital multimeter

Answer

LCR meter

Answer

Frequency counter

Question 4

A NPN transistor has VBE = 0 V and VCE = VCC. The transistor is most likely:

Accepted Answer

In cutoff

Answer

In saturation

Answer

Operating normally in active region

Answer

Shorted collector to emitter

Question 5

A resistor measures 10% above its marked value. The technician should:

Accepted Answer

Accept it if within its tolerance rating

Answer

Replace it immediately

Answer

Increase the supply voltage to compensate

Answer

Solder a parallel resistor to reduce value

Question 6

What does a reading of OL (overload) on a DMM set to resistance indicate when measuring a capacitor?

Accepted Answer

The capacitor is fully charged and appears open

Answer

The capacitor is shorted

Answer

The DMM is malfunctioning

Answer

The capacitor value exceeds the range

Question 7

In a series RC circuit, if the capacitor is shorted, what will the voltage across the resistor measure?

Accepted Answer

Full supply voltage

Answer

Zero volts

Answer

Half supply voltage

Answer

The capacitor's rated voltage