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2-21. Which of the following statements
describes output signal number one if the
input signals are 180 degrees out of
phase with each other?
1. A sine wave in phase with input
signal number one
2. A sine wave in phase with input
signal number two
3. A sine wave in phase with output
signal number two
4. Not a sine wave
2-22. Which of the following statements
describes the output signal if the input
signals are 180 degrees out of phase with
each other and the output signal is taken
between the output terminals?
1. A sine wave
2. Not a sine wave
3. A sine wave 90 degrees out of phase
with input signal number one
4. A sine wave in phase with input
signals number one and two
2-23. If the input amplitudes are increased to
15 millivolts and are 180 degrees out of
phase, what will be the peak-to-peak
amplitude of the combined output?
1. 1 volt
2. 2 volts
3. 3 volts
4. 1.5 volts
2-24. What will be the peak-to-peak amplitude
of the combined output if the inputs are 6
millivolts peak-to-peak, 180 degrees out
of phase, and the gain is 20?
1. 2 volts
2. 2.4 volts
3. 0.12 volts
4. 0.24 volts
2-25. Which of the following is NOT a
requirement for an operational amplifier?
1. Very high gain
2. Very high input impedance
3. Very high output impedance
4. Very low output impedance
2-26. Which of the following types of
components are used in most operational
amplifiers?
1. Transistor circuits
2. Electron tube circuits
3. Both 1 and 2 above
4. Integrated circuits
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