General Class License Exam Questions

Subelement G6

Circuit Components

Groups

G6A - Resistors; Capacitors; Inductors; Rectifiers; solid state diodes and transistors; vacuum tubes; batteries
G6B - Analog and digital integrated circuits (ICs); microprocessors; memory; I/O devices; microwave ICs (MMICs); display device

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Group G6A Resistors; Capacitors; Inductors; Rectifiers; solid state diodes and transistors; vacuum tubes; batteries

G6A01 What is the minimum allowable discharge voltage for maximum life of a standard 12 volt lead acid battery?

6 volts
8.5 volts
10.5 volts
12 volts

G6A02 What is an advantage of the low internal resistance of nickel-cadmium batteries?

Long life
High discharge current
High voltage
Rapid recharge

G6A03 What is the approximate junction threshold voltage of a germanium diode?

0.1 volt
0.3 volts
0.7 volts
1.0 volts

G6A04 When is it acceptable to recharge a carbon-zinc primary cell?

As long as the voltage has not been allowed to drop below 1.0 volt
When the cell is kept warm during the recharging period
When a constant current charger is used
Never

G6A05 What is the approximate junction threshold voltage of a conventional silicon diode?

0.1 volt
0.3 volts
0.7 volts
1.0 volts

G6A06 Which of the following is an advantage of using a Schottky diode in an RF switching circuit rather than a standard silicon diode?

Lower capacitance
Lower inductance
Longer switching times
Higher breakdown voltage

G6A07 What are the stable operating points for a bipolar transistor used as a switch in a logic circuit?

Its saturation and cutoff regions
Its active region (between the cutoff and saturation regions)
Its peak and valley current points
Its enhancement and depletion modes

G6A08 Why must the cases of some large power transistors be insulated from ground?

To increase the beta of the transistor
To improve the power dissipation capability
To reduce stray capacitance
To avoid shorting the collector or drain voltage to ground

G6A09 Which of the following describes the construction of a MOSFET?

The gate is formed by a back-biased junction
The gate is separated from the channel with a thin insulating layer
The source is separated from the drain by a thin insulating layer
The source is formed by depositing metal on silicon

G6A10 Which element of a triode vacuum tube is used to regulate the flow of electrons between cathode and plate?

Control grid
Heater
Screen Grid
Trigger electrode

G6A11 Which of the following solid state devices is most like a vacuum tube in its general operating characteristics?

A bipolar transistor
A field effect transistor
A tunnel diode
A varistor

G6A12 What is the primary purpose of a screen grid in a vacuum tube?

To reduce grid-to-plate capacitance
To increase efficiency
To increase the control grid resistance
To decrease plate resistance

G6A13 Why is the polarity of applied voltages important for polarized capacitors?

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 of these choices are correct

G6A14 Which of the following is an advantage of ceramic capacitors as compared to other types of capacitors?

Tight tolerance
High stability
High capacitance for given volume
Comparatively low cost

G6A15(C) Which of the following is an advantage of an electrolytic capacitor?

Tight tolerance
Much less leakage than any other type
High capacitance for a given volume
Inexpensive RF capacitor

G6A16 What will happen to the resistance if the temperature of a resistor is increased?

It will change depending on the resistor's reactance coefficient
It will stay the same
It will change depending on the resistor's temperature coefficient
It will become time dependent

G6A17 Which of the following is a reason not to use wire-wound resistors in an RF circuit?

The resistor's tolerance value would not be adequate for such a circuit
The resistor's inductance could make circuit performance unpredictable
The resistor could overheat
The resistor's internal capacitance would detune the circuit

G6A18 What is an advantage of using a ferrite core toroidal inductor?

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 of these choices are correct

G6A19 How should the winding axes of two solenoid inductors be oriented to minimize their mutual inductance?

In line
Parallel to each other
At right angles to each other
Interleaved

Group G6B Analog and digital integrated circuits (ICs); microprocessors; memory; I/O devices; microwave ICs (MMICs); display device

G6B01 Which of the following is an analog integrated circuit?

NAND Gate
Microprocessor
Frequency Counter
Linear voltage regulator

G6B02 What is meant by the term MMIC?

Multi Megabyte Integrated Circuit
Monolithic Microwave Integrated Circuit
Military Manufactured Integrated Circuit
Mode Modulated Integrated Circuit

G6B03 Which of the following is an advantage of CMOS integrated circuits compared to TTL integrated circuits?

Low power consumption
High power handling capability
Better suited for RF amplification
Better suited for power supply regulation

G6B04 What is meant by the term ROM?

Resistor Operated Memory
Read Only Memory
Random Operational Memory
Resistant to Overload Memory

G6B05 What is meant when memory is characterized as non-volatile?

It is resistant to radiation damage
It is resistant to high temperatures
The stored information is maintained even if power is removed
The stored information cannot be changed once written

G6B06 What kind of device is an integrated circuit operational amplifier?

Digital
MMIC
Programmable Logic
Analog

G6B07 Which of the following is an advantage of an LED indicator compared to an incandescent indicator?

Lower power consumption
Faster response time
Longer life
All of these choices are correct

G6B08 How is an LED biased when emitting light?

Beyond cutoff
At the Zener voltage
Reverse Biased
Forward Biased

G6B09 Which of the following is a characteristic of a liquid crystal display?

It requires ambient or back lighting
It offers a wide dynamic range
It has a wide viewing angle
All of these choices are correct

G6B10 What two devices in an Amateur Radio station might be connected using a USB interface?

Computer and transceiver
Microphone and transceiver
Amplifier and antenna
Power supply and amplifier

G6B11 What is a microprocessor?

A low power analog signal processor used as a microwave detector
A computer on a single integrated circuit
A microwave detector, amplifier, and local oscillator on a single integrated circuit
A low voltage amplifier used in a microwave transmitter modulator stage

G6B12 Which of the following connectors would be a good choice for a serial data port?

PL-259
Type N
Type SMA
DE-9

G6B13 Which of these connector types is commonly used for RF connections at frequencies up to 150 MHz?

Octal
RJ-11
PL-259
DB-25

G6B14 Which of these connector types is commonly used for audio signals in Amateur Radio stations?

PL-259
BNC
RCA Phono
Type N

G6B15 What is the main reason to use keyed connectors instead of non-keyed types?

Prevention of use by unauthorized persons
Reduced chance of incorrect mating
Higher current carrying capacity
All of these choices are correct

G6B16 Which of the following describes a type N connector?

A moisture-resistant RF connector useful to 10 GHz
A small bayonet connector used for data circuits
A threaded connector used for hydraulic systems
An audio connector used in surround-sound installations

G6B17 What is the general description of a DIN type connector?

A special connector for microwave interfacing
A DC power connector rated for currents between 30 and 50 amperes
A family of multiple circuit connectors suitable for audio and control signals
A special watertight connector for use in marine applications

G6B18 What is a type SMA connector?

A large bayonet connector usable at power levels in excess of 1 KW
A small threaded connector suitable for signals up to several GHz
A connector designed for serial multiple access signals
A type of push-on connector intended for high voltage applications