The op amp can amplify
AC signals only
DC signals only
Both AC and DC signals
Neither AC nor DC signals
The tail current of a diff amp is
Half of either collector current
Equal to either collector current
Two times either collector current
Equal to the difference in base currents
The input offset current equals the
Difference between the two base currents
Average of the two base currents
Collector current divided by current gain
Difference between the two base-emitter voltages
The tail current equals the
Difference between the two emitter currents
Sum of the two emitter currents
Collector voltage divided by collector resistance
The voltage gain of a diff amp with an unloaded differential output is equal to Rc divided by
r'e
r'e/2
2 r'e
Re
The input impedance of a diff amp equals r'e times
0
Rc
2 ß
A dc signal has a frequency of
0 Hz
60 Hz
0 to more than 1 MHz
1 MHz
When the two input terminals of a diff amp are grounded,
The base currents are equal
The collector currents are equal
An output error voltage usually exists
The ac output voltage is zero
A common-mode signal is applied to
The noninverting input
The inverting input
Both inputs
The top of the tail resistor
The common-mode voltage gain is
Smaller than the voltage gain
Equal to the voltage gain
Greater than the voltage gain
None of the above
The input stage of an op amp is usually a
Diff amp
Class B push-pull amplifier
CE amplifier
Swamped amplifier
When the two bases are grounded in a diff amp the voltage across each emitter diode is
Zero
0.7 V
The same
High
The input offset current is usually
Less than the input bias current
Equal to zero
Less than the input offset voltage
Unimportant when a base resistor is used
A compensating capacitor prevents
Voltage gain
Oscillations
Input offset current
Power bandwidth
At the unity gain frequency, the open-loop voltage gain is
1
Av (mid)
Very large
If the cutoff frequency is 20 Hz and the midband open-loop voltage gain is 1,000,000, the unity gain frequency is
20 Hz
2 MHz
20 MHz
If the two supply voltages are ± 12 V, the MPP value of an op amp is closest to
+12 V
-12 V
24 V
The 741 V has a unity-gain frequency of
10 Hz
20 kHz
15 MHz
The initial slope of a sine wave increases when
Frequency increases
Peak value increases
Cc increases
Slew rate decreases
If the frequency of the input signal is greater than the power bandwidth,
Slew-rate distortion occurs
A normal output signal occurs
Output offset voltage increases
Distortion may occur
An op amp has an open base resistor. The output voltage will be
Slightly different from zero
Maximum positive or negative
An amplified sine wave
Above the cutoff frequency, the voltage gain of a 741 C decreases approximately
10 dB per decade
20 dB per octave
10 dB per octave
20 dB per decade
The voltage gain of an op amp is unity at the
Cutoff frequency
Unity-gain frequency
Generator frequency
When the slew-rate distortion of a sine wave occurs, the output
Is larger
Appears triangular
Is normal
Has no offset
A 741 C has
A voltage gain of 100,000
An input impedance of 2 MΩ
An output impedance of 75 Ω
All of the above
