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Mixed Quiz
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1The frequency response of an amplifier is the graph of its output versus time.
A)True
B)False


2A common-emitter amplifier that uses direct coupling is an example of a dc amplifier.
A)True
B)False


3The frequency response of an ac amplifier shows increased voltage gain at low frequencies because of the effects of capacitive reactances.
A)True
B)False


4The frequencies at which the voltage gain equals 1.414 of its maximum value are called the half-power frequencies.
A)True
B)False


5A designer can use capacitive coupling between amplifier stages in order to amplify down to zero hertz.
A)True
B)False


6Each time the ordinary power gain decreases by a factor of 2, the decibel power gain decreases by 10 dB.
A)True
B)False


7The total voltage gain of a two-stage cascaded amplifier is the product of the individual voltage gains.
A)True
B)False


8The total decibel voltage gain of two cascaded stages equals the product of the individual decibel voltage gains.
A)True
B)False


9To prevent oscillations, most op amp circuits include an LC lead circuit that rolls off the voltage gain.
A)True
B)False


10Impedance matching in communication systems is used because it produces power transfer.


11A plot is a graph that uses decibels and provides more information about the amplifier’s response outside the midband.


12When an op amp includes one dominant bypass capacitor that rolls off the voltage gain at a rate of 20 dB per decade, it means the op amp is compensated.


13A fast and simple method to test the frequency response of an amplifier is by using testing.


14Most amplifiers are now being built using amplifiers.


15At high frequencies, the voltage gain of an ac amplifier decreases because of capacitance.


16In music, the doubling of the frequency is referred to as .


17Instead of the term cutoff frequency, many technicians use the term frequency.


18The Miller effect has useful applications because
A)it creates virtual capacitors that are much larger than the feedback capacitor
B)it creates virtual resistors that are much larger than the load resistor
C)it creates additional gain without adding amplifiers
D)it makes coupling capacitors appear smaller than they actually are


19In a dc amplifier, all the frequencies from zero up to the cutoff frequency are referred to as the
A)roll off
B)maximum band
C)notch frequencies
D)bandwidth


20Sources of stray capacitance or inductance of conventional feed-through components does not include
A)geometry and internal structure of the device
B)printed-circuit layout
C)power supply voltage
D)external leads on the device


21What is a dc amplifier that has high voltage gain, high input impedance, and low output impedance?
A)BJT
B)MOSFET
C)op amp
D)JFET


22The total voltage gain of a two-stage cascaded amplifier is the
A)voltage gain of the individual stage
B)sum of the individual voltage gains
C)product of the individual voltage gains
D)difference of the voltage gains


23A type of graph that uses decibels and provides more information about the amplifier’s response outside the midband is the
A)response curve
B)decibel curve
C)frequency plot
D)Bode plot


24What type of circuit rolls off voltage gain and prevents an op amp from oscillating?
A)attenuator
B)RC lead
C)RC lag
D)LC lag


25What is the fastest and most accurate way to analyze the frequency response of a discrete BJT or FET amplifier?
A)use MultiSim or other circuit simulation software
B)use square wave testing
C)use sine wave injection and oscilloscope signal tracing
D)use frequency generator injection and frequency counter testing





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