Diode and Transistor Quiz 1 most important

What is the primary purpose of a diode?

• To regulate voltage

• To allow current in one direction only

• To amplify current

The threshold voltage for a silicon diode is approximately:

• 0.3 V

• 0.5 V

• 0.7 V

Which diode type is used for voltage regulation?

• Schottky diode

• Zener diode

• Varactor diode

What component emits light when forward biased?

• Photodiode

• LED

• Zener diode

What is the color of light emitted by GaAsP LEDs?

• Blue

• Red

• Green

What happens when a diode is reverse biased?

• It conducts current

• It amplifies voltage

• It blocks current

What is the purpose of a free-wheeling diode in a relay circuit?

• Amplify signals

• Protect against back-EMF

• Reverse polarity

In a full-wave bridge rectifier, how many diodes are used?

• 2

• 4

• 6

What does a capacitor do in a rectifier circuit?

• Increase current

• Smooth output voltage

• Switch polarity

What is the typical forward voltage of a red LED?

• 0.3 V

• 1.8 V

• 5 V