3-C-027: Light Emitting Diodes
3-27C1:
What type of bias is required for an LED to produce luminescence?
Forward bias.
Reverse bias.
Logic 0 (Lo) bias.
Logic 1 (Hi) bias.
3-27C2:
What determines the visible color radiated by an LED junction?
The materials used to construct the device.
The color of a lens in an eyepiece.
The amount of voltage across the device.
The amount of current through the device.
3-27C3:
What is the normal operating current of a light-emitting diode?
20 mA.
5 mA.
10 mA.
40 mA.
3-27C4:
What would be the maximum current to safely illuminate a LED?
20 mA.
1 amp.
1 microamp.
500 milliamps.
3-27C5:
An LED facing a photodiode in a light-tight enclosure is commonly known as a/an:
Optoisolator.
Seven segment LED.
Optointerrupter.
Infra-red (IR) detector.
3-27C6:
What circuit component must be connected in series to protect an LED?
Series resistor.
Bypass capacitor to ground.
Electrolytic capacitor.
Shunt coil in series.
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Color key:
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● = Weak
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● = Review
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● = Learned
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● = Incorrect answer
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