Sub Element G6: Circuit Components Flashcards

1
Q

What is the minimum allowable discharge voltage for maximum life of a standard 12 volt lead-acid battery?

A

10.5 volts

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2
Q

What is an advantage of the low internal resistance of nickel-cadmium batteries?

A

High discharge current

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3
Q

What is the approximate junction threshold voltage of a germanium diode?

A

0.3 volts

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4
Q

Which of the following is an advantage of an electrolytic capacitor?

A

High capacitance for a given volume

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5
Q

What is the approximate junction threshold voltage of a conventional silicon diode?

A

0.7 volts

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6
Q

Which of the following is a reason not to use wire-wound resistors in an RF circuit?

A

The resistor’s inductance could make circuit performance unpredictable

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7
Q

What are the stable operating points for a bipolar transistor used as a switch in a logic circuit?

A

Its saturation and cutoff regions

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8
Q

What is an advantage of using a ferrite core toroidal inductor?

A

Large values of inductance may be obtained

The magnetic properties of the core may be optimized for a specific range of frequencies

Most of the magnetic field is contained in the core

All these choices are correct

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9
Q

Which of the following describes the construction of a MOSFET?

A

The gate is separated from the channel with a thin insulating layer

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10
Q

Which element of a triode vacuum tube is used to regulate the flow of electrons between cathode and plate?

A

Control grid

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11
Q

What happens when an inductor is operated above its self-resonant frequency?

A

It becomes capacitive

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12
Q

What is the primary purpose of a screen grid in a vacuum tube?

A

To reduce grid-to-plate capacitance

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13
Q

Why is the polarity of applied voltages important for polarized capacitors?

A

Incorrect polarity can cause the capacitor to short-circuit

Reverse voltages can destroy the dielectric layer of an electrolytic capacitor

The capacitor could overheat and explode

All these choices are correct

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14
Q

Which of the following is an advantage of ceramic capacitors as compared to other types of capacitors?

A

Comparatively low cost

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15
Q

What determines the performance of a ferrite core at different frequencies?

A

The composition, or “mix”, of materials used

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16
Q

What is meant by the term MMIC?

A

Monolithic Microwave Integrated Circuit

17
Q

Which of the following is an advantage of CMOS integrated circuits compared to TTL integrated circuits?

A

Low power consumption

18
Q

What is meant by the term ROM?

A

Read Only Memory

19
Q

What is meant when memory is characterized as non-volatile?

A

The stored information is maintained even if power is removed

20
Q

What kind of device is an integrated circuit operational amplifier?

A

Analog

21
Q

Which of the following describes a type N connector?

A

A moisture-resistant RF connector useful to 10 GHz

22
Q

How is an LED biased when emitting light?

A

Forward biased

23
Q

Which of these connector types is commonly used for RF connections at frequencies up to 150 MHz?

A

PL-259

24
Q

Which of the following is a characteristic of a liquid crystal display?

A

It utilizes ambient or back lighting

25
Q

How does a ferrite bead or core reduce common-mode RF current on the shield of a coaxial cable?

A

By creating an impedance in the current’s path

26
Q

What is a type SMA connector?

A

A small threaded connector suitable for signals up to several GHz

27
Q

Which of these connector types is commonly used for audio signals in Amateur Radio stations?

A

RCA Phono