G6 - CIRCUIT COMPONENTS [3 Exam Questions 3 Groups] Flashcards
Which of the following is an important characteristic for capacitors used to filter the DC output of a switching power supply?
A. Low equivalent series resistance
B. High equivalent series resistance
C. Low Temperature coefficient
D. High Temperature coefficient
A. Low equivalent series resistance
Which of the following types of capacitors are often used in power supply circuits to filter the rectified AC?
A. Disc ceramic
B. Vacuum variable
C. Mica
D. Electrolytic
D. Electrolytic
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
D. Comparatively low cost
Which of the following is an advantage of an electrolytic capacitor?
A. Tight tolerance
B. Non-polarized
C. High capacitance for given volume
D. Inexpensive RF capacitor
C. High capacitance for given volume
Which of the following is one effect of lead inductance in a capacitor used at VHF and above?
A. Effective capacitance may be reduced
B. Voltage rating may be reduced
C. ESR may be reduced
D. The polarity of the capacitor might become reversed
A. Effective capacitance may be reduced
What will happen to the resistance if the temperature of a resistor is increased?
A. It will change depending on the resistor�s reactance coefficient
B. It will stay the same
C. It will change depending on the resistor’s temperature coefficient
D. It will become time dependent
C. It will change depending on the resistor’s temperature coefficient
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 the circuit
B. The resistor’s inductance could make circuit performance unpredictable
Which of the following describes a thermistor?
A. A resistor that is resistant to changes in value with temperature variations
B. A device having a specific change in resistance with temperature variations
C. A special type of transistor for use at very cold temperatures
D. A capacitor that changes value with temperature
B. A device having a specific change in resistance with temperature variations
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 of these choices are correct
D. All of these choices are correct
How should the winding axes of solenoid inductors be placed to minimize their mutual inductance?
A. In line
B. Parallel to each other
C. At right angles
D. Interleaved
C. At right angles
Why would it be important to minimize the mutual inductance between two inductors?
A. To increase the energy transfer between circuits
B. To reduce unwanted coupling between circuits
C. To reduce conducted emissions
D. To increase the self-resonant frequency of the inductors
B. To reduce unwanted coupling between circuits
What is a common name for an inductor used to help smooth the DC output from the rectifier in a conventional power supply?
A. Back EMF choke
B. Repulsion coil
C. Charging inductor
D. Filter choke
D. Filter choke
What is an effect of inter-turn capacitance in an inductor?
A. The magnetic field may become inverted
B. The inductor may become self resonant at some frequencies
C. The permeability will increase
D. The voltage rating may be exceeded
B. The inductor may become self resonant at some frequencies
What is the peak-inverse-voltage rating of a rectifier?
A. The maximum voltage the rectifier will handle in the conducting direction
B. 1.4 times the AC frequency
C. The maximum voltage the rectifier will handle in the non-conducting direction
D. 2.8 times the AC frequency
C. The maximum voltage the rectifier will handle in the non-conducting direction
What are two major ratings that must not be exceeded for silicon diode rectifiers?
A. Peak inverse voltage; average forward current
B. Average power; average voltage
C. Capacitive reactance; avalanche voltage
D. Peak load impedance; peak voltage
A. Peak inverse voltage; average forward 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
B. 0.3 volts
When two or more diodes are connected in parallel to increase current handling capacity, what is the purpose of the resistor connected in series with each diode?
A. To ensure the thermal stability of the power supply
B. To regulate the power supply output voltage
C. To ensure that one diode doesn’t carry most of the current
D. To act as an inductor
C. To ensure that one diode doesn’t carry most of the current
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
C. 0.7 volts
Which of the following is an advantage of using a Schottky diode in an RF switching circuit as compared to a standard silicon diode?
A. Lower capacitance
B. Lower inductance
C. Longer switching times
D. Higher breakdown voltage
A. Lower capacitance
What are the stable operating points for a bipolar transistor used as a switch in a logic circuit?
A. Its saturation and cut-off regions
B. Its active region (between the cut-off and saturation regions)
C. Its peak and valley current points
D. Its enhancement and deletion modes
A. Its saturation and cut-off regions
Why must the cases of some large power transistors be insulated from ground?
A. To increase the beta of the transistor
B. To improve the power dissipation capability
C. To reduce stray capacitance
D. To avoid shorting the collector or drain voltage to ground
D. To avoid shorting the collector or drain voltage to ground
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
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
A. Control grid
Which of the following solid state devices is most like a vacuum tube in its general operating characteristics?
A. A bipolar transistor
B. A Field Effect Transistor
C. A tunnel diode
D. A varistor
B. A Field Effect Transistor
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
A. To reduce grid-to-plate capacitance
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
B. High discharge current
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
C. 10.5 volts
When is it acceptable to recharge a carbon-zinc primary cell?
A. As long as the voltage has not been allowed to drop below 1.0 volt
B. When the cell is kept warm during the recharging period
C. When a constant current charger is used
D. Never
D. Never
Which of the following is an analog integrated circuit?
A. NAND Gate
B. Microprocessor
C. Frequency Counter
D. Linear voltage regulator
D. Linear voltage regulator
What is meant by the term MMIC?
A. Multi Megabyte Integrated Circuit
B. Monolithic Microwave Integrated Circuit
C. Military-specification Manufactured Integrated Circuit
D. Mode Modulated Integrated Circuit
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
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
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
C. The stored information is maintained even if power is removed
Which of the following describes an integrated circuit operational amplifier?
A. Digital
B. MMIC
C. Programmable Logic
D. Analog
D. Analog
What is one disadvantage of an incandescent indicator compared to an LED?
A. Low power consumption
B. High speed
C. Long life
D. High power consumption
D. High power consumption
How is an LED biased when emitting light?
A. Beyond cutoff
B. At the Zener voltage
C. Reverse Biased
D. Forward Biased
D. Forward Biased
Which of the following is a characteristic of a liquid crystal display?
A. It requires ambient or back lighting
B. It offers a wide dynamic range
C. It has a wide viewing angle
D. All of these choices are correct
A. It requires ambient or back lighting
What two devices in an Amateur Radio station might be connected using a USB interface?
A. Computer and transceiver
B. Microphone and transceiver
C. Amplifier and antenna
D. Power supply and amplifier
A. Computer and transceiver
What is a microprocessor?
A. A low power analog signal processor used as a microwave detector
B. A computer on a single integrated circuit
C. A microwave detector, amplifier, and local oscillator on a single integrated circuit
D. A low voltage amplifier used in a microwave transmitter modulator stage
B. A computer on a single integrated circuit
Which of the following connectors would be a good choice for a serial data port?
A. PL-259
B. Type N
C. Type SMA
D. DE-9
D. DE-9
Which of these connector types is commonly used for RF service at frequencies up to 150 MHz?
A. Octal
B. RJ-11
C. PL-259
D. DB-25
C. PL-259
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
C. RCA Phono
What is the main reason to use keyed connectors instead of non-keyed types?
A. Prevention of use by unauthorized persons
B. Reduced chance of incorrect mating
C. Higher current carrying capacity
D. All of these choices are correct
B. Reduced chance of incorrect mating
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
A. A moisture-resistant RF connector useful to 10 GHz
What is the general description of a DIN type connector?
A. A special connector for microwave interfacing
B. A DC power connector rated for currents between 30 and 50 amperes
C. A family of multiple circuit connectors suitable for audio and control signals
D. A special watertight connector for use in marine applications
C. A family of multiple circuit connectors suitable for audio and control signals
What is a type SMA connector?
A. A large bayonet-type connector usable at power levels in excess of 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
B. A small threaded connector suitable for signals up to several GHz
