G6 – CIRCUIT COMPONENTS [2 Exam Questions – 2 Groups] Flashcards
What is the minimum allowable discharge voltage for maximum life of a standard 12 volt lead-acid battery?
A. 6 volts
B. 8.5 volts
C. 10.5 volts
D. 12 volts
G6A01 (C)
C. 10.5 volts
What is an advantage of the low internal resistance of nickel-cadmium batteries?
A. Long life
B. High discharge current
C. High voltage
D. Rapid recharge
G6A02 (B)
B. High discharge current
What is the approximate junction threshold voltage of a germanium diode?
A. 0.1 volt
B. 0.3 volts
C. 0.7 volts
D. 1.0 volts
G6A03 (B)
B. 0.3 volts
Which of the following is an advantage of an electrolytic capacitor?
A. Tight tolerance
B. Much less leakage than any other type
C. High capacitance for a given volume
D. Inexpensive RF capacitor
G6A04 (C)
C. High capacitance for a given volume
What is the approximate junction threshold voltage of a conventional silicon diode?
A. 0.1 volt
B. 0.3 volts
C. 0.7 volts
D. 1.0 volts
G6A05 (C)
C. 0.7 volts
Which of the following is a reason not to use wire-wound resistors in an RF circuit?
A. The resistor’s tolerance value would not be adequate for such a circuit
B. The resistor’s inductance could make circuit performance unpredictable
C. The resistor could overheat
D. The resistor’s internal capacitance would detune
G6A06 (B)
B. 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?
A. Its saturation and cutoff regions
B. Its active region (between the cutoff and saturation regions)
C. Its peak and valley current points
D. Its enhancement and depletion modes
G6A07 (A)
A. Its saturation and cutoff regions
What is an advantage of using a ferrite core toroidal inductor?
A. Large values of inductance may be obtained
B. The magnetic properties of the core may be optimized for a specific range of frequencies
C. Most of the magnetic field is contained in the core
D. All these choices are correct
G6A08 (D)
D. All these choices are correct
Which of the following describes the construction of a MOSFET?
A. The gate is formed by a back-biased junction
B. The gate is separated from the channel with a thin insulating layer
C. The source is separated from the drain by a thin insulating layer
D. The source is formed by depositing metal on silicon
G6A09 (B)
B. 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?
A. Control grid
B. Heater
C. Screen grid
D. Trigger electrode
G6A10 (A)
A. Control grid
What happens when an inductor is operated above its self-resonant frequency?
A. Its reactance increases
B. Harmonics are generated
C. It becomes capacitive
D. Catastrophic failure is likely
G6A11 (C)
C. It becomes capacitive
What is the primary purpose of a screen grid in a vacuum tube?
A. To reduce grid-to-plate capacitance
B. To increase efficiency
C. To increase the control grid resistance
D. To decrease plate resistance
G6A12 (A)
A. To reduce grid-to-plate capacitance
Why is the polarity of applied voltages important for polarized capacitors?
A. Incorrect polarity can cause the capacitor to short-circuit
B. Reverse voltages can destroy the dielectric layer of an electrolytic capacitor
C. The capacitor could overheat and explode
D. All these choices are correct
G6A13 (D)
D. All these choices are correct
Which of the following is an advantage of ceramic capacitors as compared to other types of capacitors?
A. Tight tolerance
B. High stability
C. High capacitance for given volume
D. Comparatively low cost
G6A14 (D)
D. Comparatively low cost
What determines the performance of a ferrite core at different frequencies?
A. Its conductivity
B. Its thickness
C. The composition, or “mix,” of materials used
D. The ratio of outer diameter to inner diameter
G6B01 (C)
C. The composition, or “mix,” of materials used
What is meant by the term MMIC?
A. Multi-Megabyte Integrated Circuit
B. Monolithic Microwave Integrated Circuit
C. Military Manufactured Integrated Circuit
D. Mode Modulated Integrated Circuit
G6B02 (B)
B. Monolithic Microwave Integrated Circuit
Which of the following is an advantage of CMOS integrated circuits compared to TTL integrated circuits?
A. Low power consumption
B. High power handling capability
C. Better suited for RF amplification
D. Better suited for power supply regulation
G6B03 (A)
A. Low power consumption
What is meant by the term ROM?
A. Resistor Operated Memory
B. Read Only Memory
C. Random Operational Memory
D. Resistant to Overload Memory
G6B04 (B)
B. Read Only Memory
What is meant when memory is characterized as non-volatile?
A. It is resistant to radiation damage
B. It is resistant to high temperatures
C. The stored information is maintained even if power is removed
D. The stored information cannot be changed once written
G6B05 (C)
C. The stored information is maintained even if power is removed
What kind of device is an integrated circuit operational amplifier?
A. Digital
B. MMIC
C. Programmable Logic
D. Analog
G6B06 (D)
D. Analog
Which of the following describes a type N connector?
A. A moisture-resistant RF connector useful to 10 GHz
B. A small bayonet connector used for data circuits
C. A threaded connector used for hydraulic systems
D. An audio connector used in surround-sound installations
G6B07 (A)
A. A moisture-resistant RF connector useful to 10 GHz
How is an LED biased when emitting light?
A. Beyond cutoff
B. At the Zener voltage
C. Reverse biased
D. Forward biased
G6B08 (D)
D. Forward biased
Which of the following is a characteristic of a liquid crystal display?
A. It utilizes ambient or back lighting
B. It offers a wide dynamic range
C. It consumes relatively high power
D. It has relatively short lifetime
G6B09 (A)
A. 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?
A. By creating an impedance in the current’s path
B. It converts common-mode current to differential mode
C. By creating an out-of-phase current to cancel the common-mode current
D. Ferrites expel magnetic fields
G6B10 (A)
A. By creating an impedance in the current’s path
What is a type SMA connector?
A. A large bayonet connector usable at power levels more than 1 KW
B. A small threaded connector suitable for signals up to several GHz
C. A connector designed for serial multiple access signals
D. A type of push-on connector intended for high-voltage applications
G6B11 (B)
B. 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?
A. PL-259
B. BNC
C. RCA Phono
D. Type N
G6B12 (C)
C. RCA Phono
Which of these connector types is commonly used for RF connections at frequencies up to 150 MHz?
A. Octal
B. RJ-11
C. PL-259
D. DB-25
G6B13 (C)
C. PL-259
