Operational Amplifier Fundamentals – Exercise – 4

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

Answer
Answer : (c)
Explanation
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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

Answer
Answer : (d)
Explanation
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183. What is this circuit?

(a) a low-pass filter
(b) a high-pass filter
(c) a bandpass filter
(d) a band-stop filter

Answer
Answer : (d)
Explanation
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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

Answer
Answer : (d)
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185. An astable multivibrator is also known as a:

(a) one-shot multivibrator
(b) free-running multivibrator
(c) bistable multivibrator
(d) monostable multivibrator

Answer
Answer : (b)
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