Sub Element G6: Circuit Components Flashcards
What is the minimum allowable discharge voltage for maximum life of a standard 12 volt lead-acid battery?
10.5 volts
What is an advantage of the low internal resistance of nickel-cadmium batteries?
High discharge current
What is the approximate junction threshold voltage of a germanium diode?
0.3 volts
Which of the following is an advantage of an electrolytic capacitor?
High capacitance for a given volume
What is the approximate junction threshold voltage of a conventional silicon diode?
0.7 volts
Which of the following is a reason not to use wire-wound resistors in an RF circuit?
The resistor’s inductance could make circuit performance unpredictable
What are the stable operating points for a bipolar transistor used as a switch in a logic circuit?
Its saturation and cutoff regions
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 these choices are correct
Which of the following describes the construction of a MOSFET?
The gate is separated from the channel with a thin insulating layer
Which element of a triode vacuum tube is used to regulate the flow of electrons between cathode and plate?
Control grid
What happens when an inductor is operated above its self-resonant frequency?
It becomes capacitive
What is the primary purpose of a screen grid in a vacuum tube?
To reduce grid-to-plate capacitance
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 these choices are correct
Which of the following is an advantage of ceramic capacitors as compared to other types of capacitors?
Comparatively low cost
What determines the performance of a ferrite core at different frequencies?
The composition, or “mix”, of materials used
What is meant by the term MMIC?
Monolithic Microwave Integrated Circuit
Which of the following is an advantage of CMOS integrated circuits compared to TTL integrated circuits?
Low power consumption
What is meant by the term ROM?
Read Only Memory
What is meant when memory is characterized as non-volatile?
The stored information is maintained even if power is removed
What kind of device is an integrated circuit operational amplifier?
Analog
Which of the following describes a type N connector?
A moisture-resistant RF connector useful to 10 GHz
How is an LED biased when emitting light?
Forward biased
Which of these connector types is commonly used for RF connections at frequencies up to 150 MHz?
PL-259
Which of the following is a characteristic of a liquid crystal display?
It utilizes ambient or back lighting
How does a ferrite bead or core reduce common-mode RF current on the shield of a coaxial cable?
By creating an impedance in the current’s path
What is a type SMA connector?
A small threaded connector suitable for signals up to several GHz
Which of these connector types is commonly used for audio signals in Amateur Radio stations?
RCA Phono
