14054812
Descrição
Quiz por Katrina Himes, atualizado more than 1 year ago
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Criado por Katrina Himes
quase 6 anos atrás
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Questão 1
Questão
Which of these is the best description of a zener diode?
Responda
-
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.
Questão 2
Questão
A transistor has how many pn junctions?
Responda
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1
-
2
-
3
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4
Questão 3
Questão
The current gain of a transistor is defined as the ratio of the collector current to the
Responda
-
Base current
-
Emitter current
-
Supply current
-
Collector current
Questão 4
Questão
A zener diode
Responda
-
Is a battery
-
Has a constant voltage in the breakdown region
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Has a barrier potential of 1 V
-
Is forward biased
Questão 5
Questão
The barrier potential across each silicon deletion layer is
Responda
-
0
-
0.3 V
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0.7 V
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1 V
Questão 6
Questão
When the base resistor increases, the collector voltage will probably
Responda
-
Decrease
-
Stay the same
-
Increase
-
Do all of the above
Questão 7
Questão
If the zener diode in a zener regulator is connected with the wrong polarity, the load voltage will be closest to
Responda
-
0.7 V
-
10 V
-
14 V
-
18 V
Questão 8
Questão
The emitter diode is usually
Responda
-
Forward biased
-
Reverse biased
-
Nonconducting
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Operating in the breakdown region
Questão 9
Questão
If the base resistor is very small, the transistor will operate in the
Responda
-
Cutoff region
-
Active region
-
Saturation region
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Breakdown region
Questão 10
Questão
At high frequencies, ordinary diodes don't work properly because of
Responda
-
Forward bias
-
Reverse bias
-
Breakdown
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Charge storage
Questão 11
Questão
For normal operation of the transistor, the collector diode has to be
Responda
-
Forward biased
-
Reversed biased
-
Nonconducting
-
Operating in the breakdown region
Questão 12
Questão
Ignoring the bulk resistance of the collector diode, the collector-emitter saturation voltage is
Responda
-
0
-
A few tenths of a volt
-
1 V
-
Supply voltage
Questão 13
Questão
Breakdown does not destroy a zener diode, provided the zener current is less than the
Responda
-
Breakdown voltage
-
Zener test current
-
Maximum zener current rating
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Barrier potential
Questão 14
Questão
Most of the electrons in the base of an npn transistor flow
Responda
-
Out of the base lead
-
Into the collector
-
Into the emitter
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Into the base supply
Questão 15
Questão
If the base supply voltage is disconnected, the collector-emitter voltage will equal
Responda
-
0 V
-
6 V
-
10.5 V
-
Collector supply voltage
Questão 16
Questão
A photodiode is normally
Responda
-
Forward biased
-
Reverse biased
-
Neither forward nor reverse biased
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Emitting light
Questão 17
Questão
The base-emitter voltage is usually
Responda
-
Less than the base supply voltage
-
Equal to the base supply voltage
-
More than the base supply voltage
-
Cannot answer
Questão 18
Questão
The base current is 50 μA. If the current gain is 100, the collector current is closest in value to
Responda
-
50 μA
-
500 μA
-
2 mA
-
5 mA
Questão 19
Questão
The device associated with voltage controlled capacitance is a
Responda
-
Light-emitting diode
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Photodiode
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Varactor diode
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Zener diode
Questão 20
Questão
The beta of a transistor is the ratio of the
Responda
-
Collector current to the emitter current
-
Collector current to base current
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Base current to collector current
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Emitter current to collector current
Questão 21
Questão
A circuit with a fixed emitter current is called
Responda
-
Base bias
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Emitter bias
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Transistor bias
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Two-supply bias
Questão 22
Questão
To isolate an output circuit from an input circuit, which is the device to use?
Responda
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Back diode
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Optocoupler
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Seven-segment indicator
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Tunnel diode
Questão 23
Questão
The collector-emitter voltage is usually
Responda
-
Less than the collector supply voltage
-
Equal to the collector supply voltage
-
More than the collector supply voltage
-
Cannot answer
Questão 24
Questão
When the current gain increases from 50 to 300 in an emitter-biased circuit, the collector current
Responda
-
Remains almost the same
-
Decreases by a factor of 6
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Increases by a factor of 6
-
Is zero
Questão 25
Questão
If the base resistor is open, what is the collector current?
Responda
-
0
-
1 mA
-
2 mA
-
10 mA
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