Pregunta 1
Pregunta
Which of these is the best description of a zener diode?
Respuesta
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It is a rectifier diode.
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It is a constant-voltage device.
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It is a constant-current device.
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It works in the forward region.
Pregunta 2
Pregunta
A transistor has how many pn junctions?
Pregunta 3
Pregunta
The current gain of a transistor is defined as the ratio of the collector current to the
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Base current
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Emitter current
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Supply current
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Collector current
Pregunta 4
Pregunta 5
Pregunta
The barrier potential across each silicon deletion layer is
Pregunta 6
Pregunta
When the base resistor increases, the collector voltage will probably
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Decrease
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Stay the same
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Increase
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Do all of the above
Pregunta 7
Pregunta
If the zener diode in a zener regulator is connected with the wrong polarity, the load voltage will be closest to
Pregunta 8
Pregunta
The emitter diode is usually
Pregunta 9
Pregunta
If the base resistor is very small, the transistor will operate in the
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Cutoff region
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Active region
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Saturation region
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Breakdown region
Pregunta 10
Pregunta
At high frequencies, ordinary diodes don't work properly because of
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Forward bias
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Reverse bias
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Breakdown
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Charge storage
Pregunta 11
Pregunta
For normal operation of the transistor, the collector diode has to be
Pregunta 12
Pregunta
Ignoring the bulk resistance of the collector diode, the collector-emitter saturation voltage is
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0
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A few tenths of a volt
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1 V
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Supply voltage
Pregunta 13
Pregunta
Breakdown does not destroy a zener diode, provided the zener current is less than the
Pregunta 14
Pregunta
Most of the electrons in the base of an npn transistor flow
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Out of the base lead
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Into the collector
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Into the emitter
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Into the base supply
Pregunta 15
Pregunta
If the base supply voltage is disconnected, the collector-emitter voltage will equal
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0 V
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6 V
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10.5 V
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Collector supply voltage
Pregunta 16
Pregunta
A photodiode is normally
Pregunta 17
Pregunta
The base-emitter voltage is usually
Respuesta
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Less than the base supply voltage
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Equal to the base supply voltage
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More than the base supply voltage
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Cannot answer
Pregunta 18
Pregunta
The base current is 50 μA. If the current gain is 100, the collector current is closest in value to
Pregunta 19
Pregunta
The device associated with voltage controlled capacitance is a
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Light-emitting diode
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Photodiode
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Varactor diode
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Zener diode
Pregunta 20
Pregunta
The beta of a transistor is the ratio of the
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Collector current to the emitter current
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Collector current to base current
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Base current to collector current
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Emitter current to collector current
Pregunta 21
Pregunta
A circuit with a fixed emitter current is called
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Base bias
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Emitter bias
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Transistor bias
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Two-supply bias
Pregunta 22
Pregunta
To isolate an output circuit from an input circuit, which is the device to use?
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Back diode
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Optocoupler
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Seven-segment indicator
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Tunnel diode
Pregunta 23
Pregunta
The collector-emitter voltage is usually
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Less than the collector supply voltage
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Equal to the collector supply voltage
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More than the collector supply voltage
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Cannot answer
Pregunta 24
Pregunta
When the current gain increases from 50 to 300 in an emitter-biased circuit, the collector current
Pregunta 25
Pregunta
If the base resistor is open, what is the collector current?