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MCQs

Total Questions : 163 | Page 16 of 17 pages
Question 151. . All of the following are basic op-amp input modes of operation EXCEPT
  1.    inverting mode
  2.    common-mode
  3.    double-ended
  4.    single-ended
 Discuss Question
Answer: Option A. -> inverting mode
Question 152. . If a noninverting amplifier has an RIN of 1000 ohms and an RFB of 2.5 kilohms, what is the RIN voltage when 1.42 mV is applied to the correct input?
  1.    3.5 mV
  2.    ground
  3.    1.42 mV
  4.    0.56 mV
 Discuss Question
Answer: Option C. -> 1.42 mV
Question 153. . Input impedance [Zin(I)] of an inverting amplifier is approximately equal to:
  1.    Ri
  2.    Rf + Ri
  3.    ∞
  4.    Rf – Ri
 Discuss Question
Answer: Option A. -> Ri
Question 154. . A circuit whose output is proportional to the difference between the input signals is considered to be which type of amplifier?
  1.    common-mode
  2.    darlington
  3.    differential
  4.    operational
 Discuss Question
Answer: Option C. -> differential
Question 155. . With negative feedback, the returning signal
  1.    is proportional to the output current
  2.    is proportional to the differential voltage gain
  3.    opposes the input signal
  4.    aids the input signal
 Discuss Question
Answer: Option C. -> opposes the input signal
Question 156. . The voltage follower has a:
  1.    closed-loop voltage gain of unity
  2.    small open-loop voltage gain
  3.    closed-loop bandwidth of zero
  4.    large closed-loop output impedance
 Discuss Question
Answer: Option A. -> closed-loop voltage gain of unity
Question 157. . If the gain of a closed-loop inverting amplifier is 3.9, with an input resistor value of 1.6 kilohms, what value of feedback resistor is necessary?
  1.    6240 ohms
  2.    2.4 kilohms
  3.    410 ohms
  4.    0.62 kilohms
 Discuss Question
Answer: Option A. -> 6240 ohms
Question 158. . The ratio between differential gain and common-mode gain is called:
  1.    amplitude
  2.    differential-mode rejection
  3.    common-mode rejection
  4.    phase
 Discuss Question
Answer: Option C. -> common-mode rejection
Question 159. . A circuit whose output is proportional to the difference between the input signals is considered to be which type of amplifier?
  1.    common-mode
  2.    darlington
  3.    differential
  4.    operational
 Discuss Question
Answer: Option C. -> differential
Question 160. . With negative feedback, the returning signal
  1.    is proportional to the output current
  2.    is proportional to the differential voltage gain
  3.    opposes the input signal
  4.    aids the input signal
 Discuss Question
Answer: Option C. -> opposes the input signal

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