G6B: Rectifiers; solid state diodes and transistors; solar cells; vacuum tubes; batteries
G6B01:
What is the peak-inverse-voltage rating of a rectifier?
The maximum voltage the rectifier will handle in the non-conducting direction
The maximum voltage the rectifier will handle in the conducting direction
1.4 times the AC frequency
2.8 times the AC frequency
G6B02:
What are the two major ratings that must not be exceeded for silicon-diode rectifiers?
Peak inverse voltage; average forward current
Average power; average voltage
Capacitive reactance; avalanche voltage
Peak load impedance; peak voltage
G6B03:
What is the approximate junction threshold voltage of a germanium diode?
0.3 volts
0.1 volt
0.7 volts
1.0 volts
G6B04:
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?
The resistors ensure that one diode doesn't carry most of the current
The resistors ensure the thermal stability of the power supply
The resistors regulate the power supply output voltage
The resistors act as swamping resistors in the circuit
G6B05:
What is the approximate junction threshold voltage of a silicon diode?
0.7 volts
0.1 volt
0.3 volts
1.0 volts
G6B06:
Which of the following is an advantage of using a Schottky diode in an RF switching circuit as compared to a standard silicon diode?
Lower capacitance
Lower inductance
Longer switching times
Higher breakdown voltage
G6B07:
What are the stable operating points for a bipolar transistor that is used as a switch in a logic circuit?
Its saturation and cut-off regions
Its active region (between the cut-off and saturation regions)
Between its peak and valley current points
Between its enhancement and deletion modes
G6B08:
Why is it often necessary to insulate the case of a large power transistor?
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
G6B09:
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 later
The source is formed by depositing metal on silicon
G6B10:
Which element of a triode vacuum tube is used to regulate the flow of electrons between cathode and plate?
Control grid
Heater
Screen Grid
Suppressor grid
G6B11:
Which of the following solid state devices is most like a vacuum tube in its general characteristics?
An FET
A bipolar transistor
A tunnel diode
A varistor
G6B12:
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 high frequency response
To decrease plate resistance
G6B13:
What is an advantage of the low internal resistance of Nickel Cadmium batteries?
High discharge current
Long life
High voltage
Rapid recharge
G6B14:
What is the minimum allowable discharge voltage for maximum life of a standard 12 volt lead acid battery?
10.5 volts
6 volts
8.5 volts
12 volts
G6B15:
When is it acceptable to recharge a carbon-zinc primary cell?
Never
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
G6B16:
Which of the following is a rechargeable battery?
Nickel Metal Hydride
Carbon-zinc
Silver oxide
Mercury
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