1. What usually controls the open-loop cutoff frequency of an op amp?
a. Stray-wiring capacitance
b. Base-emitter capacitance
c. Collector-base capacitance
d. Compensating capacitance
d
2. A compensating capacitor prevents
a. Voltage gain
b. Oscillations
c. Input offset current
d. Power bandwidth
b
3. At the unity-gain frequency, the open-loop voltage gain is
a. 1
b. Amid
c. Zero
d. Very large
a
4. The cutoff frequency of an op amp equals the unity-gain frequency divided by
a. the cutoff frequency
b. Closed-loop voltage gain
c. Unity
d. Common-mode voltage gain
b
5. If the cutoff frequency is 15 Hz and the midband open-loop voltage gain is 1,000,000, the unity-gain frequency is
a. 25 Hz
b. 1 MHz
c. 1.5 MHz
d. 15 MHz
d
6. If the unity-gain frequency is 5 MHz and the midband open-loop voltage gain is 200,000, the cutoff frequency is
a. 25 Hz
b. 1 MHz
c. 1.5 MHz
d. 15 MHz
a
7. The initial slope of a sine wave is directly proportional to
a. Slew rate
b. Frequency
c. Voltage gain
d. Capacitance
b
8. When the initial slope of a sine wave is greater than the slew rate,
a. Distortion occurs
b. Linear operation occurs
c. Voltage gain is maximum
d. The op amp works best
a
9. The power bandwidth increases when
a. Frequency decreases
b. Peak value decreases
c. Initial slope decreases
d. Voltage gain increases
b
10. A 741C uses
a. Discrete resistors
b. Inductors
c. Active-load resistors
d. A large coupling capacitor
c
11. A 741C cannot work without
a. Discrete resistors
b. Passive loading
c. Dc return paths on the two bases
d. A small coupling capacitor
c
12. The input impedance of a BIFET op amp is
a. Low
b. Medium
c. High
d. Extremely high
d
13. An LF157A is a
a. Diff amp
b. Source follower
c. Bipolar op amp
d. BIFET op amp
d
14. If the two supply voltages are plus and minus 15 V, the MPP value of an op amp is closest to
a. 0
b. +15V
c. -15 V
d. 30 V
d
15. The open-loop cutoff frequency of a 741C is controlled by
a. A coupling capacitor
b. The output short circuit current
c. The power bandwidth
d. A compensating capacitor
d
16. The 741C has a unity-gain frequency of
a. 10 Hz
b. 20 kHz
c. 1 MHz
d. 15 MHz
c
17. The unity-gain frequency equals the product of closed-loop voltage gain and the
a. Compensating capacitance
b. Tail current
c. Closed-loop cutoff frequency
d. Load resistance
c
18. If funity is 10 MHz and midband open-loop voltage gain is 1,000,000, then the open-loop cutoff frequency of the op amp is
a. 10 Hz
b. 20 Hz
c. 50 Hz
d. 100 Hz
a
19. The initial slope of a sine wave increases when
a. Frequency decreases
b. Peak value increases
c. Cc increases
d. Slew rate decreases
b
20. If the frequency is greater than the power bandwidth,
a. Slew-rate distortion occurs
b. A normal output signal occurs
c. Output offset voltage increases
d. Distortion may occur
a
21. An op amp has an open base resistor. The output voltage will be
a. Zero
b. Slightly different from zero
c. Maximum positive or negative
d. An amplified sine wave
c
22. An op amp has a voltage gain of 500,000. If the output voltage is 1 V, the input voltage is
a. 2 microvolts
b. 5 mV
c. 10 mV
d. 1 V
a
23. A 741C has supply voltages of plus and minus 15 V. If the load resistance is large, the MPP value is
a. 0
b. +15 V
c. 27 V
d. 30 V
c
24. Above the cutoff frequency, the voltage gain of a 741C decreases approximately
a. 10 dB per decade
b. 20 dB per octave
c. 10 dB per octave
d. 20 dB per decade
d
25. The voltage gain of an op amp is unity at the
a. Cutoff frequency
b. Unity-gain frequency
c. Generator frequency
d. Power bandwidth
b
26. When slew-rate distortion of a sine wave occurs, the output
a. Is larger
b. Appears triangular
c. Is normal
d. Has no offset
b
27. A 741C has
a. A voltage gain of 100,000
b. An input impedance of 2 Mohm
c. An output impedance of 75 ohm
d. All of the above
d
28. The closed-loop voltage gain of an inverting amplifier equals
a. The ratio of the input resistance to the feedback resistance
b. The open-loop voltage gain
c. The feedback resistance divided by the input resistance
d. The input resistance
c
29. The noninverting amplifier has a
a. Large closed-loop voltage gain
b. Small open-loop voltage gain
c. Large closed-loop input impedance
d. Large closed-loop output impedance
c
30. The voltage follower has a
a. Closed-loop voltage gain of unity
b. Small open-loop voltage gain
c. Closed-loop bandwidth of zero
d. Large closed-loop output impedance
a
31. A summing amplifier can have
a. No more than two input signals
b. Two or more input signals
c. A closed-loop input impedance of infinity
d. A small open-loop voltage gain
b
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