14054812
Descripción
Test por Katrina Himes, actualizado hace más de 1 año
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Creado por Katrina Himes
hace más de 8 años
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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?
Respuesta
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1
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2
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3
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4
Pregunta 3
Pregunta
The current gain of a transistor is defined as the ratio of the collector current to the
Respuesta
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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
A zener diode
Respuesta
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Is a battery
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Has a constant voltage in the breakdown region
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Has a barrier potential of 1 V
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Is forward biased
Pregunta 5
Pregunta
The barrier potential across each silicon deletion layer is
Respuesta
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0
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0.3 V
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0.7 V
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1 V
Pregunta 6
Pregunta
When the base resistor increases, the collector voltage will probably
Respuesta
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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
Respuesta
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0.7 V
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10 V
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14 V
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18 V
Pregunta 8
Pregunta
The emitter diode is usually
Respuesta
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Forward biased
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Reverse biased
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Nonconducting
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Operating in the breakdown region
Pregunta 9
Pregunta
If the base resistor is very small, the transistor will operate in the
Respuesta
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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
Respuesta
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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
Respuesta
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Forward biased
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Reversed biased
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Nonconducting
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Operating in the breakdown region
Pregunta 12
Pregunta
Ignoring the bulk resistance of the collector diode, the collector-emitter saturation voltage is
Respuesta
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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
Respuesta
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Breakdown voltage
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Zener test current
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Maximum zener current rating
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Barrier potential
Pregunta 14
Pregunta
Most of the electrons in the base of an npn transistor flow
Respuesta
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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
Respuesta
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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
Respuesta
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Forward biased
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Reverse biased
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Neither forward nor reverse biased
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Emitting light
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
Respuesta
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50 μA
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500 μA
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2 mA
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5 mA
Pregunta 19
Pregunta
The device associated with voltage controlled capacitance is a
Respuesta
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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
Respuesta
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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
Respuesta
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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?
Respuesta
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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
Respuesta
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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
Respuesta
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Remains almost the same
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Decreases by a factor of 6
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Increases by a factor of 6
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Is zero
Pregunta 25
Pregunta
If the base resistor is open, what is the collector current?
Respuesta
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0
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1 mA
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2 mA
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10 mA
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