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Mixed Quiz
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1A two-supply emitter bias circuit typically used in transistor base circuits is the most popular method of providing transistor bias.
A)True
B)False


2Voltage-divider bias is really collector bias in disguise.
A)True
B)False


3A well-designed voltage-divider bias circuit is one in which the voltage divider appears stiff to the output resistance of the collector.
A)True
B)False


4Whenever possible a designer will configure a stiff voltage divider for base bias, because it will produce a stable Q point.
A)True
B)False


5A firm voltage divider means that the collector current will be approximately 10 percent higher than the stiff value.
A)True
B)False


6Since voltage-divider bias is derived from emitter bias, the Q point varies with changes in current gain.
A)True
B)False


7Emitter-feedback bias uses a capacitor that provides positive feedback in attempt to stabilize the operating point.
A)True
B)False


8Collector-feedback bias is also called self-bias.
A)True
B)False


9Emitter feedback has always been very popular.
A)True
B)False


10Collector-feedback bias is also called .


11Collector-feedback bias is still sensitive to changes in current gain, but it is used because of its .


12A transistor is used when the electronics equipment has a negative power supply.


13The most widely used transistor biasing circuit is called bias.


14Voltage-divider bias produces a fixed value of emitter current that results in a stable operating point that is of the current gain.


15Coupling capacitors between transistor stages appear as circuits to dc voltage and currents.


16The intent of emitter-feedback bias is to swamp out the in current gain.


17To prevent meter loading, a voltmeter used to make transistor circuit voltage measurements should have an input impedance of ohms.


18Emitter-feedback and collector-feedback are typically not adequate because
A)there is too much negative feedback
B)there is not enough negative feedback
C)circuitry is too complex
D)there is not enough positive feedback


19With a pnp transistor, the base-emitter junction will be forward biased
A)when the emitter voltage is 0.7 V above the base voltage
B)when the emitter voltage is 0.7 V below the base voltage
C)when the transistor is in cut-off
D)when the collector voltage is 0.7 V above the base voltage


20Using a firm voltage divider means that the collector current will be approximately
A)5 percent lower than the stiff value
B)10 percent lower than the stiff value
C)50 percent lower than the stiff value
D)10 percent higher than the stiff value


21Historically, the first attempt at stabilizing the operating point of a transistor circuit was to use
A)base bias
B)stiff bias
C)emitter-feedback bias
D)collector-feedback bias


22Collector-feedback bias is also called
A)collector-follower bias
B)emitter-feedback bias
C)voltage-divider bias
D)self-bias


23With ambiguous troubles, the troubleshooter very often must
A)replace all suspected components
B)memorize the circuit diagram
C)disconnect one suspected component and test it
D)disconnect all suspected components and apply power


24What should a troubleshooter do if the base, collector, and emitter voltages in a transistor circuit all measure 0 V?
A)replace the transistor
B)check supply voltage and leads
C)disconnect base resistors
D)check collector resistor


25The schematic diagram of a pnp transistor shows
A)the emitter as an arrow pointing in
B)the emitter as an arrow pointing out
C)the collector as an arrow pointing in
D)the collector as an arrow pointing out





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