69 lines
2.8 KiB
Markdown
69 lines
2.8 KiB
Markdown
E6B Diodes
|
|
|
|
- [[E6B01]] (B)
|
|
What is the most useful characteristic of a Zener diode? #card
|
|
- [[A.]] A constant current drop under conditions of varying voltage
|
|
- [[B.]] A constant voltage drop under conditions of varying current
|
|
- [[C.]] A negative resistance region
|
|
- [[D.]] An internal capacitance that varies with the applied voltage
|
|
- [[E6B02]] (D)
|
|
Which characteristic of a Schottky diode makes it a better choice than a silicon junction diode for use as a power supply rectifier? #card
|
|
- [[A.]] Much higher reverse voltage breakdown
|
|
- [[B.]] More constant reverse avalanche voltage
|
|
- [[C.]] Longer carrier retention time
|
|
- [[D.]] Lower forward voltage drop
|
|
- [[E6B03]] (B)
|
|
What property of an LED's semiconductor material determines its forward voltage drop? #card
|
|
- [[A.]] Intrinsic resistance
|
|
- [[B.]] Band gap
|
|
- [[C.]] Junction capacitance
|
|
- [[D.]] Junction depth
|
|
- [[E6B04]] (A)
|
|
What type of semiconductor device is designed for use as a voltage-controlled capacitor? #card
|
|
- [[A.]] Varactor diode
|
|
- [[B.]] Tunnel diode
|
|
- [[C.]] Silicon-controlled rectifier
|
|
- [[D.]] Zener diode
|
|
- [[E6B05]] (D)
|
|
What characteristic of a PIN diode makes it useful as an RF switch? #card
|
|
- [[A.]] Extremely high reverse breakdown voltage
|
|
- [[B.]] Ability to dissipate large amounts of power
|
|
- [[C.]] Reverse bias controls its forward voltage drop
|
|
- [[D.]] Low junction capacitance
|
|
- [[E6B06]] (D)
|
|
Which of the following is a common use of a Schottky diode? #card
|
|
- [[A.]] In oscillator circuits as the negative resistance element
|
|
- [[B.]] As a variable capacitance in an automatic frequency control circuit
|
|
- [[C.]] In power supplies as a constant voltage reference
|
|
- [[D.]] As a VHF/UHF mixer or detector
|
|
- [[E6B07]] (B)
|
|
What causes a junction diode to fail from excessive current? #card
|
|
- [[A.]] Excessive inverse voltage
|
|
- [[B.]] Excessive junction temperature
|
|
- [[C.]] Insufficient forward voltage
|
|
- [[D.]] Charge carrier depletion
|
|
- [[E6B08]] (A)
|
|
Which of the following is a Schottky barrier diode? #card
|
|
- [[A.]] Metal-semiconductor junction
|
|
- [[B.]] Electrolytic rectifier
|
|
- [[C.]] PIN junction
|
|
- [[D.]] Thermionic emission diode
|
|
- [[E6B09]] (C)
|
|
What is a common use for point-contact diodes? #card
|
|
- [[A.]] As a constant current source
|
|
- [[B.]] As a constant voltage source
|
|
- [[C.]] As an RF detector
|
|
- [[D.]] As a high-voltage rectifier
|
|
- [[E6B10]] (B)
|
|
In Figure [[E6-2]], which is the schematic symbol for a Schottky diode? #card
|
|
|
|
- [[A.]] 1
|
|
- [[B.]] 6
|
|
- [[C.]] 2
|
|
- [[D.]] 3
|
|
- [[E6B11]] (A)
|
|
What is used to control the attenuation of RF signals by a PIN diode? #card
|
|
- [[A.]] Forward DC bias current
|
|
- [[B.]] A variable RF reference voltage
|
|
- [[C.]] Reverse voltage larger than the RF signal
|
|
- [[D.]] Capacitance of an RF coupling capacitor |