181. A circuit whose output is proportional to the difference between the input signals is considered to be which type of amplifier?
(a) common-mode
(b) darlington
(c) differential
(d) operational
182. What is the cutoff frequency of this low-pass filter?
(a) 4.8 kHz
(b) 3.8 kHz
(c) 2.8 kHz
(d) 1.8 kHz
183. What is this circuit?
(a) a low-pass filter
(b) a high-pass filter
(c) a bandpass filter
(d) a band-stop filter
184. What three subcircuits does a phase locked loop (PLL) consist of?
(a) phase comparator, comparator, and VCO
(b) phase comparator, bandpass filter, and VCO
(c) phase comparator, bandpass filter, and demodulator
(d) phase comparator, low-pass filter, and VCO
185. An astable multivibrator is also known as a:
(a) one-shot multivibrator
(b) free-running multivibrator
(c) bistable multivibrator
(d) monostable multivibrator
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Operational Amplifier Fundamentals » Exercise - 3 101. An operational amplifier has a ________ input impedance and a ________ output impedance. (a) high, low (b) high, high (c) low, low (d) low, high 102. What is the difference voltage if the inputs are an ideal opposite signal? (a) The differential gain times twice the input signal. (b) The differential gain times the input signal. (c) The common-mode gain times twice the input signal. (d) The common-mode gain times the input signal. 103. At what input voltage level does the output voltage level become numerically equal to the value of the common-mode gain of the amplifier? (a) Vi1 = –Vi2 = 0.25 V (b) Vi1 = –Vi2 = 0.50 V (c) Vi1 = –Vi2 = 0.75 V (d) Vi1 = –Vi2 = 1.00 V 104. What is the difference output voltage of any signals applied to the input terminals? (a) The differential gain times the difference input voltage. (b) The common-mode gain times the common input voltage. (c) The sum of the differential gain times the difference input voltage and the common-mode gain times the common input voltage. (d) The difference of the differential gain times the difference input voltage and the common-mode gain times the common input voltage. 105.…- 555555555580. Which of the following is (are) the result of gain reduction by a feedback? (a) The amplifier voltage gain is a more stable and precise value. (b) The input impedance of the circuit is increased over that of the op-amp alone. (c) The output impedance is reduced over that of the op-amp alone. (d) All of the above
- 5555555555143. With negative feedback, the returning signal (a) is proportional to the output current (b) is proportional to the differential voltage gain (c) opposes the input signal (d) aids the input signal
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- 5555555555192. The voltage gain of the amplifier in the given circuit would increase if ______. (a) the feedback resistor was decreased in value (b) the input voltage was increased (c) the input resistor was increased in value (d) None of the above