Operational Amplifiers problems
- 1. If the input to a comparator is a sine wave, the output is a:
Options- A. ramp voltage
- B. sine wave
- C. rectangular wave
- D. sawtooth wave Discuss
Correct Answer: rectangular wave
- 2. A portion of the output that provides circuit stabilization is considered to be:
Options- A. negative feedback
- B. distortion
- C. open-loop
- D. positive feedback Discuss
Correct Answer: negative feedback
- 3. An astable multivibrator is also known as a:
Options- A. one-shot multivibrator
- B. free-running multivibrator
- C. bistable multivibrator
- D. monostable multivibrator Discuss
Correct Answer: free-running multivibrator
- 4. The open-loop voltage gain (Aol) of an op-amp is the
Options- A. external voltage gain the device is capable of
- B. internal voltage gain the device is capable of
- C. most controlled parameter
- D. same as Acl Discuss
Correct Answer: internal voltage gain the device is capable of
- 5. In a PLL, to obtain lock, the signal frequency must:
Options- A. come within the lock range
- B. be less than the capture frequency
- C. come within the capture range
- D. be greater than the capture frequency Discuss
Correct Answer: come within the capture range
- 6. The common-mode voltage gain is
Options- A. smaller than differential voltage gain
- B. equal to voltage gain
- C. greater than differential voltage gain
- D. None of the above Discuss
Correct Answer: smaller than differential voltage gain
- 7. If an op-amp has one input grounded and the other input has a signal feed to it, then it is operating as what?
Options- A. Common-mode
- B. Single-ended
- C. Double-ended
- D. Noninverting mode Discuss
Correct Answer: Single-ended
- 8. Another name for a unity gain amplifier is:
Options- A. difference amplifier
- B. comparator
- C. single ended
- D. voltage follower Discuss
Correct Answer: voltage follower
- 9. In order for an output to swing above and below a zero reference, the op-amp circuit requires:
Options- A. a resistive feedback network
- B. zero offset
- C. a wide bandwidth
- D. a negative and positive supply Discuss
Correct Answer: a negative and positive supply
- 10. What three subcircuits does a phase locked loop (PLL) consist of?
Options- 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 Discuss
Correct Answer: phase comparator, low-pass filter, and VCO
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