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<!-- TODO FIXME WEBMASTER: quizdown here -->

CoverFullSize

Contents of Article

Page 1: Basic Electronics
The capacitor - how it works
The Diode - how the diode works
Every Circuit Symbols
Soldering Videos
Page 2: The Transistor
- PNP or NPN
- Transistor TEST
- Page 2a: The 555 IC
  - The 555 - 1
  - The 555 TEST
Page 3: The Power Supply
- 3a: Constant Current
- 3b: Voltage Regulator
- 3c: Capacitor-fed Power Supply
Page 4: Digital Electronics
- Gates
- Touch Switch
- Gating
- 4b: The DELAY CIRCUIT
Page 5: Oscillators
Page 6: Basic Electronics 50 Questions Test
Page 7: using The Multimeter
Page 8: Constructing a Project
Page 9: Inductance

Answer the following … JavaScript is required!
Internet Explorer has JavaScript.
This is a simple test to see how much you know about basic electronics.

<!-- TODO FIXME WEBMASTER: this test might be duplicated on multiple pages. copy to one locatation & import -->

1. What does LED stand for?

Light Emitting Display
Low Energy Display
Light Emitting Diode
Light Emitting Detector

2. Name the three leads of a common transistor

Collector Bias Omitter
Base Collector Case
Emitter Collector Bias
Collector Base Emitter

3. Connecting a lead from the negative to the positive of a battery will produce:

A high resistance circuit
A short circuit
A low current path
An open circuit

4. What is the approximate characteristic voltage that develops **across a red LED?

1.7v
3.4v
0.6v
5v

5. If two resistors are placed in series, is the final resistance:

Higher
Lower
The same
Cannot be determined

6. Which is not a “common” value of resistance:

2k7
1M8
330R
4k4

7. If a small value of capacitance is connected in parallel with a large value, the combined capacitance will be:

The same
Higher
Lower

8. If the voltage on the base of a transistor increases, does it:

Turn on
Turn off
Not enough information
Remain the same

9. The resistor identified in brown is called the:

Base Bias Resistor
Load Resistor
Emitter Feedback Resistor
Bypass Resistor

10. A 100n capacitor in parallel with 10n produces:

90n
100n
110n
Cannot be determined

11. A resistor with colour bands: red-red-red-gold, has the value:

22k 5%
2k2 5%
220R 5%
22R 5%

12. The lead marked with the arrow is:

The Collector
The Base
The Emitter
The case

13. A 10k resistor in parallel with 10k produces:

10k
5k
20k
Cannot be determined

14. The symbol is:

NPN Transistor
PNP Transistor
Photo Transistor
Field Effect Transistor

15. Two 3v batteries are connected as shown. The output voltage is:

16. 4 resistors in ascending order are:

22R 270k 2k2 1M
4k7 10k 47R 330k
3R3 4R7 22R 5k6
100R 10k 1M 3k3

17. The closest value for this combination is:

4k7

18. This stage is called:

Common Base
Common Collector
Common Emitter
Emitter Follower

19. The four symbols are:

Capacitor, Microphone, Potentiometer, Electrolytic
Electrolytic, Microphone, Resistor, Capacitor
Capacitor, Piezo, Resistor, Electrolytic
Electrolytic, Coil, Resistor, Capacitor

20. The value of the combination is:

100n

200n
50n

21. The resistor marked in red is:

Base Bias Resistor
Load Resistor
Emitter Feedback Resistor
Bypass Resistor

22. A resistor and capacitor in series is called a:

Pulse Circuit
Timing Circuit/Delay Circuit
Oscillator Circuit/Frequency Circuit
Schmitt Circuit

23. A red-red-red-gold resistor in series with an orange-orange-orange-gold resistor produces:

5k5
35,200 ohms
55k
None of the above

24. Name the 4 components:

Photo transistor, switch, capacitor, coil
Transistor, mercury switch, piezo, coil
Photo transistor, reed switch, piezo, coil
Photo darlington transistor, reed switch, piezo, coil

25. To obtain a higher value of resistance, resistors are connected in:

Reverse
Forward
Parallel
Series

26. A capacitor and coil in parallel is called:

A Tuned Circuit
A Timing Circuit
A Delay Circuit
A Schmitt Circuit

27. When the base is raised, the emitter will:

Rise
Fall
Remain Fixed
Oscillate

28. What is 1,000p?

0.01n
0.0001u
0.1n
1n

29. The current in a circuit is 45mA. This is:

0.045Amp
0.00045A
0.0045A
0.45A

30. A 100n capacitor can be expressed as:

0.1u u = microfarad
0.01u
0.001u
none of the above

31. 1mA is equal to:

0.001A
0.00001A
0.01A
0.1A

32. 1,200mV is equal to:

12v
1.2v
0.12v
0.0012v

33. If a 10k resistor is placed across a 10v supply, the current will be:

10mA
1mA
0.01mA
0.1mA

34. This arrangement is called:

Common Emitter
Common Collector/Emitter Follower
Common Base

35. Identify the correctly connected LED:

36. Identify the correct statement:

The cathode lead is longer. It goes to the negative rail
The cathode lead is shorter. It goes to the negative rail
The cathode lead is shorter. It goes to the positive rail
The cathode lead is longer. It goes to the positive rail

37. The current requirement of a LED is:

1.7mA
25mA
Between 3 and 35mA
65mA

38. The signal at the collector will be …

Inverted …
In-phase …
… with the base.

39. The purpose of the capacitor:

To pass AC on the input to the base
To allow the transistor to self-bias
Block DC from the input line
To allow the stage to operate

40. The direction of conduction for a diode is:

41. A DC voltage …

rises and falls
is a sinewave
remains constant
is an audio waveform

42. A CRO is a

Cathode Ray Oscillator
Cathode Ray Oscilloscope
Capacitor-Resistor Oscillator
Capacitor-Resistor Output

43. These jargon terms mean: (Jargon = language peculiar to a ‘mickey’ ‘electro’ ‘cap’ ‘puff’; trade)

mighty, electronic, capper, picofarad
microfarad, electronic, capacitor, picofarad
microfarad, electrolytic, capacitor, picofarad
microfarad, electrolyte, capping, blow

44. The tolerance bands: gold; silver; brown, represent:

10%, 5%, 1%
5%, 10%, 2%
5%, 10%, 1%
10%, 5%, 2%

45. 223 on a capacitor represents:

0.022u u = microfarad
22n n = nanofarad
22,000p p = picofarad
All of the above

46. Arrange these in ascending order: n, p, u

p, u, n,
n, u, p
p, n, u

47. Name this symbol:

A buffer
A NOR gate
A NAND gate
A Schmitt Trigger

48. The number “104” on a capacitor indicates:

0.1u
100n
1n
10n

49. What is the multimeter detecting:

The output voltage of the Schmitt Trigger
The delay across the capacitor
The voltage across the capacitor
The current through the capacitor

50. For the XOR gate, what is the output when both inputs are HIGH:

HIGH
LOW
Can be HIGH or LOW
Cannot be determined

These are the types of questions you should be able to answer INSTANTLY, if you want to design and build microcontroller projects. If you get less than 45, now’s the time to do the Basic Electronics course . Try the test again after the course, I’m sure you will “fly” through the answers and be amazed at how much you have learnt.