2015-G6A: Resistors; Capacitors; Inductors; Rectifiers; solid state diodes and transistors; vacuum tubes; batteries
What is the minimum allowable discharge voltage for maximum life of a standard 12 volt lead acid battery?
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?
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
What is the approximate junction threshold voltage of a conventional silicon diode?
Which of the following is an advantage of using a Schottky diode in an RF switching circuit rather than a standard silicon diode?
Longer switching times
Higher breakdown voltage
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
Why must the cases of some large power transistors be insulated from ground?
To avoid shorting the collector or drain voltage to ground
To increase the beta of the transistor
To improve the power dissipation capability
To reduce stray capacitance
Which of the following describes the construction of a MOSFET?
The gate is separated from the channel with a thin insulating layer
The gate is formed by a back-biased junction
The source is separated from the drain by a thin insulating layer
The source is formed by depositing metal on silicon
Which element of a triode vacuum tube is used to regulate the flow of electrons between cathode and plate?
Which of the following solid state devices is most like a vacuum tube in its general operating characteristics?
A field effect transistor
A bipolar transistor
A tunnel diode
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
Why is the polarity of applied voltages important for polarized capacitors?
All of these choices are correct
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
Which of the following is an advantage of ceramic capacitors as compared to other types of capacitors?
Comparatively low cost
High capacitance for given volume
Which of the following is an advantage of an electrolytic capacitor?
High capacitance for a given volume
Much less leakage than any other type
Inexpensive RF capacitor
What will happen to the resistance if the temperature of a resistor is increased?
It will change depending on the resistor's temperature coefficient
It will change depending on the resistor’s reactance coefficient
It will stay the same
It will become time dependent
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
The resistor's tolerance value would not be adequate for such a circuit
The resistor could overheat
The resistor's internal capacitance would detune the circuit
What is an advantage of using a ferrite core toroidal inductor?
All of these choices are correct
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
How should the winding axes of two solenoid inductors be oriented to minimize their mutual inductance?
At right angles to each other
Parallel to each other
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