Canadian Advanced pool, section 2-04

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Subelement 2

Advanced Components and Circuits

Section 2-04

field effect transistor (FET), JFET, MOSFET

2-04-01

What is an enhancement-mode FET?

Correct Answer
A.
An FET without a channel; no current occurs with zero gate voltage
B.
An FET with a channel that blocks voltage through the gate
C.
An FET with a channel that allows current when the gate voltage is zero
D.
An FET without a channel to hinder current through the gate

2-04-01

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2-04-02

What is a depletion-mode FET?

A.
An FET without a channel; no current flows with zero gate voltage
Correct Answer
B.
An FET that has a channel with no gate voltage applied; a current flows with zero gate voltage
C.
An FET without a channel to hinder current through the gate
D.
An FET that has a channel that blocks current when the gate voltage is zero

2-04-02

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2-04-03

Why do many MOSFET devices have built-in gate protective Zener diodes?

A.
The gate-protective Zener diode keeps the gate voltage within specifications to prevent the device from overheating
B.
The gate-protective Zener diode protects the substrate from excessive voltages
Correct Answer
C.
The gate-protective Zener diode prevents the gate insulation from being punctured by small static charges or excessive voltages
D.
The gate-protective Zener diode provides a voltage reference to provide the correct amount of reverse-bias gate voltage

2-04-03

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2-04-04

Why are special precautions necessary in handling FET and CMOS devices?

A.
They are light-sensitive
Correct Answer
B.
They are susceptible to damage from static charges
C.
They have micro-welded semiconductor junctions that are susceptible to breakage
D.
They have fragile leads that may break off

2-04-04

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2-04-05

How does the input impedance of a field-effect transistor (FET) compare with that of a bipolar transistor?

A.
One cannot compare input impedance without knowing supply voltage
B.
An FET has low input impedance; a bipolar transistor has high input impedance
C.
The input impedance of FETs and bipolar transistors is the same
Correct Answer
D.
An FET has high input impedance; a bipolar transistor has low input impedance

2-04-05

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2-04-06

What are the three terminals of a junction field-effect transistor (JFET)?

A.
Emitter, base 1, base 2
B.
Emitter, base, collector
Correct Answer
C.
Gate, drain, source
D.
Gate 1, gate 2, drain

2-04-06

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2-04-07

What are the two basic types of junction field-effect transistors (JFET)?

Correct Answer
A.
N-channel and P-channel
B.
High power and low power
C.
MOSFET and GaAsFET
D.
Silicon and germanium

2-04-07

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2-04-08

Electron conduction in an n-channel depletion type MOSFET is associated with:

Correct Answer
A.
n-channel depletion
B.
p-channel depletion
C.
p-channel enhancement
D.
q-channel enhancement

2-04-08

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2-04-09

Electron conduction in an n-channel enhancement MOSFET is associated with:

A.
q-channel depletion
B.
p-channel enhancement
Correct Answer
C.
n-channel enhancement
D.
p-channel depletion

2-04-09

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2-04-10

Hole conduction in a p-channel depletion type MOSFET is associated with:

A.
n-channel enhancement
Correct Answer
B.
p-channel depletion
C.
q-channel depletion
D.
n-channel depletion

2-04-10

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2-04-11

Hole conduction in a p-channel enhancement type MOSFET is associated with:

A.
n-channel depletion
B.
n-channel enhancement
C.
q-channel enhancement
Correct Answer
D.
p-channel enhancement

2-04-11

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