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

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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

2016-E6A01: In what application is gallium arsenide used as a semiconductor material in preference to germanium or silicon?

In microwave circuits

In high-current rectifier circuits

In high-power audio circuits

In very low frequency RF circuits



2016-E6A02: Which of the following semiconductor materials contains excess free electrons?

N-type

P-type

Bipolar

Insulated gate



2016-E6A03: Why does a PN-junction diode not conduct current when reverse biased?

Holes in P-type material and electrons in the N-type material are separated by the applied voltage, widening the depletion region

Only P-type semiconductor material can conduct current

Only N-type semiconductor material can conduct current

Excess holes in P-type material combine with the electrons in N-type material, converting the entire diode into an insulator



2016-E6A04: What is the name given to an impurity atom that adds holes to a semiconductor crystal structure?

Acceptor impurity

Insulator impurity

N-type impurity

Donor impurity



2016-E6A05: What is the alpha of a bipolar junction transistor?

The change of collector current with respect to emitter current

The change of collector current with respect to base current

The change of base current with respect to collector current

The change of collector current with respect to gate current



2016-E6A06: What is the beta of a bipolar junction transistor?

The change in collector current with respect to base current

The frequency at which the current gain is reduced to 1

The breakdown voltage of the base to collector junction

The switching speed of the transistor



2016-E6A07: Which of the following indicates that a silicon NPN junction transistor is biased on?

Base-to-emitter voltage of approximately 0.6 to 0.7 volts

Base-to-emitter resistance of approximately 6 to 7 ohms

Base-to-emitter resistance of approximately 0.6 to 0.7 ohms

Base-to-emitter voltage of approximately 6 to 7 volts



2016-E6A08: What term indicates the frequency at which the grounded-base current gain of a transistor has decreased to 0.7 of the gain obtainable at 1 kHz?

Alpha cutoff frequency

Corner frequency

Alpha rejection frequency

Beta cutoff frequency



2016-E6A09: What is a depletion-mode FET?

An FET that exhibits a current flow between source and drain when no gate voltage is applied

An FET that has no current flow between source and drain when no gate voltage is applied

Any FET without a channel

Any FET for which holes are the majority carriers



2016-E6A10: In Figure E6-2, what is the schematic symbol for an N-channel dual-gate MOSFET?

4

2

5

6



2016-E6A11: In Figure E6-2, what is the schematic symbol for a P-channel junction FET?

1

2

3

6



2016-E6A12: Why do many MOSFET devices have internally connected Zener diodes on the gates?

To reduce the chance of the gate insulation being punctured by static discharges or excessive voltages

To provide a voltage reference for the correct amount of reverse-bias gate voltage

To protect the substrate from excessive voltages

To keep the gate voltage within specifications and prevent the device from overheating



2016-E6A13: What do the initials CMOS stand for?

Complementary Metal-Oxide Semiconductor

Common Mode Oscillating System

Complementary Mica-Oxide Silicon

Common Mode Organic Silicon



2016-E6A14: How does DC input impedance at the gate of a field-effect transistor compare with the DC input impedance of a bipolar transistor?

An FET has high input impedance; a bipolar transistor has low input impedance

They are both low impedance

An FET has low input impedance; a bipolar transistor has high input impedance

They are both high impedance



2016-E6A15: Which semiconductor material contains excess holes in the outer shell of electrons?

P-type

N-type

Superconductor-type

Bipolar-type



2016-E6A16: What are the majority charge carriers in N-type semiconductor material?

Free electrons

Holes

Free protons

Free neutrons



2016-E6A17: What are the names of the three terminals of a field-effect transistor?

Gate, drain, source

Gate 1, gate 2, drain

Emitter, base, collector

Emitter, base 1, base 2





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