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MCQs

Total Questions : 204 | Page 1 of 21 pages
Question 1.  An OP-AMP can be classified as amplifier.
  1.    linear
  2.    low-r.
  3.    positive feedback
  4.    RC-coupled
 Discuss Question
Answer: Option A. -> linear
Question 2.   An ideal OP-AMP has
  1.    infinite A,
  2.    infinite
  3.    zero Ro
  4.    all the above.
 Discuss Question
Answer: Option D. -> all the above.
Question 3.  OP-AMP have become very popular in industry mainly because
  1.    they are dirt cheap
  2.    their external characteristics can be changed to suit any application
  3.    of their extremely small size
  4.    they are available in different packages.
 Discuss Question
Answer: Option B. -> their external characteristics can be changed to suit any application
Question 4.  When an input voltage of 1 V is applied to an OP-AMP having A = 106 and bias supply of +15V, the output voltage available is
  1.    15 x 106V
  2.    106V
  3.    15 lAV
  4.    15 V.
 Discuss Question
Answer: Option D. -> 15 V.
Question 5.  An inverting amplifier has Rf =2 M and R =2 K, Its scale factor is
  1.    1000
  2.    1000
  3.    10-3
  4.    ?1 0-3
 Discuss Question
Answer: Option B. -> 1000
Question 6.  The gain of an actual OP-AMP is around
  1.    10,00,000
  2.    1000
  3.    100
  4.    10,000
 Discuss Question
Answer: Option A. -> 10,00,000
Question 7.  Since input resistance of an ideal OP-AMP is infinite
  1.    its output resistance is zero
  2.    its output voltage becomes independent of load resistance
  3.    its input current is zero
  4.    it becomes a current-controlled device
 Discuss Question
Answer: Option C. -> its input current is zero
Question 8.   In an inverting amplifier, the two input terminals of an ideal OP-AMP are at the same potential because.
  1.    the two input terminals are directly shorted internally
  2.    the input impedance of the OP-AMP is infinity
  3.    common-mode rejection ratio is infinity
  4.    the open-loop gain of the OP-AMP is infinity
 Discuss Question
Answer: Option B. -> the input impedance of the OP-AMP is infinity
Question 9. .  The feedback path in an OP-AMP integrator constant of
  1.    a resistor
  2.    a capacitor
  3.    a resistor and a capacitor in series
  4.    a resistor and a capacitor in parallel.
 Discuss Question
Answer: Option B. -> a capacitor
Question 10.  The open-loop gain of the operational amplifier is 105. An input signal of 1 mV is applied to the inverting input with the non-inverting input connected to the ground. The supply voltages are ?10V. The output of the amplifier will be
  1.    +100V
  2.    ? 100 V
  3.    + 10 V (approximately)
  4.    ? 10 V (approximately)
 Discuss Question
Answer: Option B. -> ? 100 V

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