Op Amp Circuits(Electrical Engineering Questions ) Questions and Answers

Question 1. An OPAMP has a slew rate of 5 V/μ S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is_______________?
  1.    10 volts
  2.    5 volts
  3.    5/ volts
  4.    5/2 volts
Explanation:-
Answer: Option D. -> 5/2 volts
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2. When a step-input is given to an op-amp integrator, the output will be______________?
  1.    A ramp
  2.    A sinusoidal wave
  3.    A rectangular wave
  4.    A triangular wave with dc bias
Explanation:-
Answer: Option A. -> A ramp
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 3. In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db & 2db respectively, then its common mode rejection ratio is________________?
  1.    23dB
  2.    25dB
  3.    46dB
  4.    50dB
Explanation:-
Answer: Option A. -> 23dB
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 4. A 741-Type OP-AMP has a gain-bandwith product of 1MHz. A non-inverting amplifier using this opamp & having a voltage gain of 20db will exhibit -3db bandwidth of______________?
  1.    50KHz
  2.    100KHz
  3.    1000/17KHz
  4.    1000/7.07KHz
Explanation:-
Answer: Option A. -> 50KHz
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 5. A differential amplifier has a differential gain of 20,000. CMMR=80dB. The common mode gain is given by_______________?
  1.    2
  2.    1
  3.    1/2
  4.    0
Explanation:-
Answer: Option A. -> 2
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 6. Assume that the op-amp of the fig. is ideal. If Vi is a triangular wave, then V0 will be______________?
  1.    Square wave
  2.    Triangular wave
  3.    Parabolic wave
  4.    Sine wave
Explanation:-
Answer: Option D. -> Sine wave
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 7. Differential amplifiers are used in______________?
  1.    Instrumentation amplifiers
  2.    Voltage followers
  3.    Voltage regulators
  4.    Buffers
Explanation:-
Answer: Option A. -> Instrumentation amplifiers
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 8. For an ideal op-amp, which of the following is true?
  1.    The differential voltage across the input terminals is zero
  2.    The current into the input terminals is zero
  3.    The current from output terminal is zero
  4.    The output resistance is zero
Explanation:-
Answer: Option C. -> The current from output terminal is zero
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 9. A differential amplifier is invariably used in the i/p stage of all op-amps. This is done basically to provide the op-amps with a very high______________?
  1.    CMMR
  2.    Bandwidth
  3.    Slew rate
  4.    Open-loop gain
Explanation:-
Answer: Option C. -> Slew rate
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 10. Which of the following amplifier is used in a digital to analog converter?
  1.    Non inverter
  2.    Voltage follower
  3.    Summer
  4.    Difference amplifier
Explanation:-
Answer: Option C. -> Summer
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
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