Special Purpose Op-Amp Circuits 1 Questions and Answers

Practice Mode
Showing 10 of 59 questions
Q41
A monostable op-amp circuit outputs
  • A Continuous oscillation
  • B One pulse when triggered
  • C No output
  • D Two alternating levels
Answer: Option B
Explanation: Monostable multivibrator produces a single pulse per trigger event.
Q42
A bistable op-amp circuit is also called
  • A Astable
  • B Monostable
  • C Schmitt trigger
  • D Flip-flop
Answer: Option D
Explanation: Bistable circuits have two stable states and act like a flip-flop.
Q43
A peak-to-peak detector measures
  • A RMS value
  • B Average value
  • C Maximum minus minimum
  • D Only maximum
Answer: Option C
Explanation: It records both top and bottom peaks to compute the p-p amplitude.
Q44
For a precision rectifier, the op-amp must have
  • A Very low slew rate
  • B Adequate slew rate and bandwidth
  • C No input bias current
  • D Very low power
Answer: Option B
Explanation: High-speed switching around diodes requires sufficient slew rate and bandwidth.
Q45
In a differentiator, increasing input capacitor value will
  • A Increase high-frequency gain
  • B Decrease corner frequency
  • C Increase corner frequency
  • D Remove phase shift
Answer: Option B
Explanation: Larger C shifts the high-pass corner lower, reducing noise amplification at midband.
Q46
A comparator with positive feedback has two thresholds called
  • A Gain margins
  • B Hysteresis levels
  • C DC offsets
  • D Pole-zero pairs
Answer: Option B
Explanation: Upper and lower switching points establish hysteresis for noise immunity.
Q47
A precision clamping circuit uses an op-amp to
  • A Increase ripple
  • B Set an accurate reference level
  • C Remove DC offset
  • D Add distortion
Answer: Option B
Explanation: Active clampers reference to an accurate DC potential for precise level shifting.
Q48
Chopper-stabilized amplifiers are used to reduce
  • A Bandwidth
  • B Input offset and drift
  • C Slew rate
  • D Output current
Answer: Option B
Explanation: Chopper techniques modulate and demodulate to cancel low-frequency offsets.
Q49
A Sallen-Key low-pass filter uses the op-amp as
  • A Inverting summing node
  • B Unity-gain buffer or gain stage
  • C Differentiator
  • D Comparator
Answer: Option B
Explanation: Sallen-Key topology uses a buffer/gain block with RC network to set poles.
Q50
In instrumentation amplifiers, gain is often set by
  • A One resistor between input buffers
  • B Two capacitors in feedback
  • C A transformer tap
  • D A zener diode
Answer: Option A
Explanation: A single gain resistor between buffer emitters/outputs sets overall gain simply.

📚 More from Electronics

← All Topics 🎯 Practice ⏱️ Take Test 🔍 Search
Electronics
Back to Electronics
Other Subjects
Questions and Answers for Competitive Exams Various Entrance Test