Canadian Advanced pool, section 2-02

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Subelement 2

Advanced Components and Circuits

Section 2-02

diodes - point-contact, junction, hot-carrier, Zener, etc.

2-02-01

What is the principal characteristic of a zener diode?

A.
A constant current under conditions of varying voltage
B.
A negative resistance region
C.
An internal capacitance that varies with the applied voltage
Correct Answer
D.
A constant voltage under conditions of varying current

2-02-01

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2-02-02

What type of semiconductor diode varies its internal capacitance as the voltage applied to its terminals varies?

Correct Answer
A.
Varactor
B.
Zener
C.
Silicon-controlled rectifier
D.
Hot-carrier

2-02-02

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2-02-03

What is a common use for the hot-carrier diode?

Correct Answer
A.
As VHF and UHF mixers and detectors
B.
As balanced mixers in FM generation
C.
As a variable capacitance in an automatic frequency control circuit
D.
As a constant voltage reference in a power supply

2-02-03

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2-02-04

What limits the maximum forward current in a junction diode?

A.
Forward voltage
Correct Answer
B.
Junction temperature
C.
Back EMF
D.
Peak inverse voltage

2-02-04

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2-02-05

What are the major ratings for junction diodes?

A.
Maximum reverse current and capacitance
B.
Maximum forward current and capacitance
Correct Answer
C.
Maximum forward current and PIV
D.
Maximum reverse current and PIV

2-02-05

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2-02-06

Structurally, what are the two main categories of semiconductor diodes?

A.
Vacuum and point contact
B.
Electrolytic and point contact
Correct Answer
C.
Junction and point contact
D.
Electrolytic and junction

2-02-06

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2-02-07

What is a common use for point contact diodes?

A.
As a constant current source
B.
As a constant voltage source
Correct Answer
C.
As an RF detector
D.
As a high voltage rectifier

2-02-07

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2-02-08

What is one common use for PIN diodes?

A.
As a constant current source
Correct Answer
B.
As an RF switch
C.
As a high voltage rectifier
D.
As a constant voltage source

2-02-08

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2-02-09

A Zener diode is a device used to:

Correct Answer
A.
regulate voltage
B.
dissipate voltage
C.
decrease current
D.
increase current

2-02-09

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2-02-10

If a Zener diode rated at 10 V and 50 watts were operated at maximum dissipation rating, it would conduct ________ amperes:

A.
50
B.
0.05
Correct Answer
C.
5
D.
0.5

2-02-10

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2-02-11

The power-handling capability of most Zener diodes is rated at 25 degrees C or approximately room temperature. If the temperature is increased, the power handling capability is:

A.
the same
Correct Answer
B.
less
C.
much greater
D.
slightly greater

2-02-11

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