Sub Element G6: Circuit Components

Question 1

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

Answer 1

10.5 volts

Question 2

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

Answer 2

High discharge current

Question 3

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

Answer 3

0.3 volts

Question 4

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

Answer 4

High capacitance for a given volume

Question 5

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

Answer 5

0.7 volts

Question 6

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

Answer 6

The resistor’s inductance could make circuit performance unpredictable

Question 7

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

Answer 7

Its saturation and cutoff regions

Question 8

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

Answer 8

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

Question 9

Which of the following describes the construction of a MOSFET?

Answer 9

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

Question 10

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

Answer 10

Control grid

Question 11

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

Answer 11

It becomes capacitive

Question 12

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

Answer 12

To reduce grid-to-plate capacitance

Question 13

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

Answer 13

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

Question 14

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

Answer 14

Comparatively low cost

Question 15

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

Answer 15

The composition, or “mix”, of materials used

Question 16

What is meant by the term MMIC?

Answer 16

Monolithic Microwave Integrated Circuit

Question 17

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

Answer 17

Low power consumption

Question 18

What is meant by the term ROM?

Answer 18

Read Only Memory

Question 19

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

Answer 19

The stored information is maintained even if power is removed

Question 20

What kind of device is an integrated circuit operational amplifier?

Answer 20

Analog

Question 21

Which of the following describes a type N connector?

Answer 21

A moisture-resistant RF connector useful to 10 GHz

Question 22

How is an LED biased when emitting light?

Answer 22

Forward biased

Question 23

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

Answer 23

PL-259

Question 24

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

Answer 24

It utilizes ambient or back lighting

Question 25

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

Answer 25

By creating an impedance in the current’s path

Question 26

What is a type SMA connector?

Answer 26

A small threaded connector suitable for signals up to several GHz

Question 27

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

Answer 27

RCA Phono