What is the most useful characteristic of a Zener diode?

1. A A constant current drop under conditions of varying voltage
2. B A constant voltage drop under conditions of varying current
3. C A negative resistance region
4. D An internal capacitance that varies with the applied voltage

Which characteristic of a Schottky diode makes it a better choice than a silicon junction diode for use as a power supply rectifier?

1. A Much higher reverse voltage breakdown
2. B More constant reverse avalanche voltage
3. C Longer carrier retention time
4. D Lower forward voltage drop

What property of an LED's semiconductor material determines its forward voltage drop?

1. A Intrinsic resistance
2. B Band gap
3. C Junction capacitance
4. D Junction depth

What type of semiconductor device is designed for use as a voltage-controlled capacitor?

1. A Varactor diode
2. B Tunnel diode
3. C Silicon-controlled rectifier
4. D Zener diode

What characteristic of a PIN diode makes it useful as an RF switch?

1. A Extremely high reverse breakdown voltage
2. B Ability to dissipate large amounts of power
3. C Reverse bias controls its forward voltage drop
4. D Low junction capacitance

Which of the following is a common use of a Schottky diode?

1. A In oscillator circuits as the negative resistance element
2. B As a variable capacitance in an automatic frequency control circuit
3. C In power supplies as a constant voltage reference
4. D As a VHF/UHF mixer or detector

What causes a junction diode to fail from excessive current?

1. A Excessive inverse voltage
2. B Excessive junction temperature
3. C Insufficient forward voltage
4. D Charge carrier depletion

Which of the following is a Schottky barrier diode?

1. A Metal-semiconductor junction
2. B Electrolytic rectifier
3. C PIN junction
4. D Thermionic emission diode

What is a common use for point-contact diodes?

1. A As a constant current source
2. B As a constant voltage source
3. C As an RF detector
4. D As a high-voltage rectifier

In Figure E6-2, which is the schematic symbol for a Schottky diode?

1. A 1
2. B 6
3. C 2
4. D 3

What is used to control the attenuation of RF signals by a PIN diode?

1. A Forward DC bias current
2. B A variable RF reference voltage
3. C Reverse voltage larger than the RF signal
4. D Capacitance of an RF coupling capacitor