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Extra Class Exam Question Pool

effective 7/01/2016 thru 6/29/2020

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2016-E6B: Diodes

2016-E6B01: What is the most useful characteristic of a Zener diode?

A constant voltage drop under conditions of varying current

A constant current drop under conditions of varying voltage

A negative resistance region

An internal capacitance that varies with the applied voltage

2016-E6B02: What is an important characteristic of a Schottky diode as compared to an ordinary silicon diode when used as a power supply rectifier?

Less forward voltage drop

Much higher reverse voltage breakdown

Controlled reverse avalanche voltage

Enhanced carrier retention time

2016-E6B03: What special type of diode is capable of both amplification and oscillation?


Point contact



2016-E6B04: What type of semiconductor device is designed for use as a voltage-controlled capacitor?

Varactor diode

Tunnel diode

Silicon-controlled rectifier

Zener diode

2016-E6B05: What characteristic of a PIN diode makes it useful as an RF switch or attenuator?

A large region of intrinsic material

Extremely high reverse breakdown voltage

Ability to dissipate large amounts of power

Reverse bias controls its forward voltage drop

2016-E6B06: Which of the following is a common use of a hot-carrier diode?

As a VHF/UHF mixer or detector

As balanced mixers in FM generation

As a variable capacitance in an automatic frequency control circuit

As a constant voltage reference in a power supply

2016-E6B07: What is the failure mechanism when a junction diode fails due to excessive current?

Excessive junction temperature

Excessive inverse voltage

Insufficient forward voltage

Charge carrier depletion

2016-E6B08: Which of the following describes a type of semiconductor diode?

Metal-semiconductor junction

Electrolytic rectifier

CMOS-field effect

Thermionic emission diode

2016-E6B09: What is a common use for point contact diodes?

As an RF detector

As a constant current source

As a constant voltage source

As a high voltage rectifier

2016-E6B10: In Figure E6-3, what is the schematic symbol for a light-emitting diode?





2016-E6B11: What is used to control the attenuation of RF signals by a PIN diode?

Forward DC bias current

A sub-harmonic pump signal

Reverse voltage larger than the RF signal

Capacitance of an RF coupling capacitor

2016-E6B12: What is one common use for PIN diodes?

As an RF switch

As a constant current source

As a constant voltage source

As a high voltage rectifier

2016-E6B13: What type of bias is required for an LED to emit light?

Forward bias

Reverse bias

Zero bias

Inductive bias

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Previous group:
2016-E6A: Semiconductor materials and devices: semiconductor materials; germanium, silicon, P-type, N-type; transistor types: NPN, PNP, junction, field-effect transistors: enhancement mode; depletion mode; MOS; CMOS; N-channel; P-channel
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2016-E6C: Digital ICs: Families of digital ICs; gates; Programmable Logic Devices (PLDs)
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