Quiz For Lesson 12:

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Question 1: When you have finished using your VOM, It is important that you set your meter's function selector to:

Its highest AC volts position, or "OFF."
"Off" or a milliamp setting.
Ohms x 1000.
Zero the needle.

Question 2: When you're using your VOM to make voltage measurements in a circuit operating at a high voltage:

Hold the test prods by their metal tips.
Set the function selector to the ohms range.
Handle the prods by their plastic insulators.
Touch the prods together.

Question 3: Using your ohmmeter to make measurements in an operating circuit will:

Give more precise readings than if the current has been turned off.
Reverse the polarity of the leads in an American made meter.
Reverse the polarity of the leads in a Japanese made meter.
Give an incorrect reading and possibly damage the meter.

Question 4: Your ohmmeter will zero in on all scale settings except Ω x 1. This is a good indication that:

The ohmmeter needs a new internal battery.
The Ω x 1 scale is damaged.
The ohms scale is easier to read between its midway point and zero charge.
The internal battery makes the black lead positive.

Question 5: When connecting a voltmeter to a circuit or component, it is important that the voltmeter always be connected:

In parallel.
In series.
With clip-on leads.
so that its red lead is negative.

Question 6: The meter we've shown on Page 1, Figure 1 has DC/MA or DC milliamps scales. Milliamps are:

Thousandths of an amp.
Millionths of an amp.
Millions of amps.
A unit of resistance.

Question 7: VOM's Usually read AC voltages as RMS voltage. If you're using a meter which reads RMS voltage and you need to know peak voltage:

Divide your reading by 70.7.
Multiply your reading by 70.7.
Multiply your reading by 1.414.
Divide your reading by 1.414.

Question 8: Battery operated circuits sometimes need repair. However, before you begin to troubleshoot a circuit, you should:

Unplug the circuit from the wall.
Obtain a digital multimeter.
Make several meter readings.
Check the batteries and battery contacts.

Question 9: When testing a switch using your ohmmeter, you should get a resistance reading of:

Infinite ohms with the switch closed.
Zero ohms with the switch closed.
Zero ohms with the switch open.
Infinite ohms when the switch is open and when it is closed.

Question 10: A suitable cleaner forplated contacts is:

An arkansas stone.
A file.
A pencil eraser.
A contact burnisher.

Question 11: You're testing a 15μfd capacitor using your ohmmeter and you get a reading of zero ohms. This indicates that the capacitor:

Will have to be replaced.
Should be good.
Is a 100Ω, 10 watt discharging resistor.
Needs to be charged before you make a reading.

Question 12: A 300v power supply is being used to operate a neon lamp circuit. The lamp will turn on at 100 volts, so there must be a 100 volt drop across the 5 megaohms resistor when the lamp turns on. What is the voltage drop across the 10 megaohms resistor when the lamp turns on?

200v.
100v.
50v.
300v.

This diagram is used for Question 12.

Question 13: You've used a battery tester to check a meter battery and find that the battery tests good. The next day the same battery fails to operate a meter because it is dead. This means that:

The battery tester is defective.
The battery was near the end of its life when it was tested.
The battery's internal resistance has decreased.
The battery tester predicts life remaining in a battery.

Question 14: Although a rechargeable battery will go through many charge/discharge cycles, eventually the battery will go bad. One "sure-fire" indication of a bad nickel-cadmium battery is:

A voltage reading at its terminals is about 1.25v
A voltage reading that is the reverse of the battery's marked polarity.
That the battery has developed a memory.
The battery having an open circuit voltage.

Question 15: Some older flash units use lead-acid batteries. If you're making a voltage check on a three cell lead-acid battery and the battery is good, you should expect to measure:

4.5 volts.
2 volts.
4.05 volts.
6 volts.

Question 16: This is a circuit which you need to troubleshoot. In particular, you need to test R1, a 10Ω resistor. Of course, you should disconnect one resistor lead before measuring between points A and B. If R1 and R3 are good, but you leave R1 connected into the circuit, what resistance would you expect to measure?

5 KΩ.
20 KΩ.
17 KΩ.
12 KΩ.

This diagram is used for Question 16.

Question 17: You'll find solder containing rosin flux to be convenient to use because the flux in the solder:

Is 18, 22, or 24 gauge.
Removes thin oxide layers and helps the solder flow.
Will be in the 25 to 35 watt range.
Can destroy your circuit.

Question 18: Although you can't learn how to solder by just reading about it, there are some things you can learn to watch for that will make the practice of soldering easier. One thing you should watch for is that the tip of your soldering iron is always:

Dull black.
Shiny.
Rated at 25 to 35 watts.
Unplated.

Question 19: When you're working on a PC board you'll want to work quickly to avoid damage to the board. The key to working quickly is:

To have clean conductors and a properly tinned iron.
To tin the PC board.
Using a desoldering wick.
Applying some solder to the iron, the touching the iron to the board.

Question 20: When you're done soldering, before you unplug your soldering iron:

Plunge the iron into cold water to cool it quickly.
Slip a small piece of shrink tubing over the top.
Tin the tip, then unplug the iron and allow it to cool.
Select the correct wattage for the job.