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Page 19: TEST

We hope you enjoyed this e-book and learnt a lot about electronics.
To see how much you have gained, we have produced a final test.
You can do the test at any time. The best idea is to do it both before and after you complete the projects and compare the results.
You can look through these pages of the e-book at any time to help with the answers as there is no such thing as “cheating.”
There is nothing wrong with getting assistance with the answers as you are not expected to remember everything. Half the skill of being organised is knowing where to look for information.
That’s why we have libraries.
Your raw score is not the one that matters. The score that has more meaning is the difference between your first attempt and your second, with the second attempt taken after you have finished the projects.
This will give you a comparative mark and will let you know how much you have learnt from the course.
If possible, it is best to take the second test a few days after completing the projects so that you get a result that reflects your long-term memory.
You see, you have two memories. A short-term memory and a long term memory.
The object of learning is to put information into your long term memory. Once it is there you never forget it.
To put something into your long term memory you quite often have to go over the details you wish to remember, a short time after they were initially learned.
When you do this, the information becomes strengthened.
This action puts it into a different section of your brain (called the long term memory section).
Some people have the ability to put information very easily into the long term section while others need to go over the information two or three times. That’s why going this whole project will be a very worthwhile investment.
Let’s see how you score with recalling the information from these projects.

Give yourself the marks shown for each question.

TEST:

1. When soldering, do you take the solder on the iron to the joint or apply the solder when the iron is near the joint? (1 mark)
   

2. Solder for electronic work must have **__** in the centre to clean the joint while soldering. (1 mark)
   

3. Name the two sizes of solder we recommend: (2 marks)
   

4. Draw the symbol for each of these components:
   (a) resistor

(b) capacitor

(c) electrolytic

(d) NPN transistor

(e) speaker

(f) two wires crossing, but not connected

(g) slide switch

(h) battery

(i) PNP transistor

(j) touch plate

(20 marks)

5. The Touch Plate is equivalent to a variable **___** . (1 mark)
   

6. When you press firmly on the Touch Plate, the resistance between the tracks:
   increases/decreases? (1 mark)
   

7. When the resistance of the Touch Plate increases, does more current or less current flow through the terminals of the plate? (1 mark)
   

8. The two types of transistors we have used in these projects are: (2 marks)
   

9. What is the name given to the resistor that biases the base of a transistor?
   **__** (1 mark)
   

10. LED stands for: (1 mark)
    

11. The shortest lead on a LED is: (1 mark)
    

12. What is the characteristic voltage that develops across a red LED when it is illuminated? **___** (1 mark)
    

13. Give another name for Flip Flop: (1 mark)
    

14. Give the colour bands for these resistors:

(a) 10k

(b) 47k

(c) 22R

(d) 1k

(e) 330k
(10 marks)

15. What is the value of these resistors:

(a) red-red-black-gold

(b) yellow-purple-orange-gold

(c) brown-black-yellow-gold

(d) orange-orange-red-gold

(e) red-red-red-gold

(f) brown-black-green-gold

(12 marks)

16. Write the preferred notation for these values:

(a) 1,000 ohms

(b) 1,000,000 ohms

(c) 2,200 ohms

(d) 4,700,000 ohms

(e) 100,000 ohms (f) 22 ohms
(6 marks)

17. Name 3 functions of a resistor:

(a) **_**

(b) **_**

(c) **_**

(3 marks)

18. Resistors can be connected in parallel and **_**. (1 mark)
    

19. Does the inclusion of a resistor increase or reduce the current through a circuit? (1 mark)
    

20. Name three types of capacitor:

(a) **__**

(b) **__**

(c) **__**

(3 marks)

21. What is another name for a free-running multivibrator? (1 mark)
    

22. What is the name given to a circuit with a resistor and capacitor in series? (1 mark)
    

23. Light passes through an optical fibre by a process called total internal ****__****. (2 marks)
    

24. From the following list, write the (a) amplifying device,
    (b) the energy storing component, (c) the current resisting component.
    (d) the energy supplying component and (e) the sound outputting device
    used in project 5.

LED, battery, switch, speaker, transistor, resistor, capacitor.

(a)

(b)

(c)

(d)

(e)

(5 marks)

25. Name the three leads of a transistor:

(a) ****___****

(b) ****___****

(c) ****___****

(3 marks)

26. An NPN transistor is a mirror image of a **__** transistor. (1 mark)
    

27. The input lead of a transistor is:**__** (1 mark)
    

28. The output lead of a transistor is: ****___**** (1 mark)
    

29. Name the components with these values:

(a) 10n

(b) BC 557

(c) 100k

(d) 10u

(e) 9v

(f) 22R
(6 marks)

30. Explain how the speaker produces a tone. (2 marks)
    

31. Name the two components in a Timing Circuit. (2 marks)
    

32. List 5 preferred resistor values: (5 marks)
    

Answers: The answers are also provided below so the page can be printed on your printer.

1. Apply the solder when the iron is close to the joint.

2. Rosin

3. 0.7mm and 1mm

4. See Symbols page

5. resistor

6. decreases

7. less

8. PNP and NPN

9. base-bias resistor

10. Light Emitting Diode

11. Cathode (k)

12. about 1.7v

13. Multivibrator

14. (a) brown-black-orange

(b) yellow-purple-orange

(c) red-red-black

(d) brown-black-red

(e) orange-orange-yellow

15. (a) 22R (b) 47k (c) 100k (d) 3k3 (e) 2k2 (f) 1M

16. (a) 1k (b) 1M (c) 2k2 (d) 4M7 (e) 100k (f) 22R

17. (a) as a current limiter, (b) as a voltage divider, (c) as a time delay component

18. series

19. reduce

20. (a) air, (b) mica, (c) polyester (d) ceramic, (e) electrolytic (f) greencap (g) monoblock.

21. astable multivibrator

22. timing circuit or delay circuit

23. reflection

24. (a) transistor (b) capacitor (c) resistor (d) battery (e) speaker

25. (a) base (b) collector (c) emitter

26. PNP transistor

27. base

28. collector

29. (a) greencap or ceramic capacitor (b) transistor (c) resistor (d) electrolytic
    (e) battery (f) resistor

30. The current through the coil starts and stops or rises and falls at a rate equal to the frequency being reproduced.

31. Resistor and capacitor.

32. Refer to the resistor colour code calculator.