Electronic Devices-Operational Amplifiers

Electronic Devices-Operational Amplifiers
11. An IC unit made using both ________ and ________ transistors is called a ________ circuit.
  • bipolar, MOSFET, BiFET
  • bipolar, MOSFET, BiMOS
  • TTL, MOSFET, TailFET
Show Answer
12. What is the slew rate of an op-amp if the output voltages change from 2 V to 3 V in 0.2 ms?
  • 5 V/ms
  • 3 V/ms
  • 2 V/ms
  • 1 V/ms
Show Answer
13. The maximum rate of change of the output voltage in response to a step input voltage is the ________ of an op-amp.
  • time constant
  • maximum frequency
  • slew rate
  • static discharge
Show Answer
14. At what input voltage level does the output voltage level become numerically equal to the value of the differential gain of the amplifier?
  • Vi1 = –Vi2 = 0.25 V
  • V i1 = –V i2 = 0.50 V
  • V i1 = –V i2 = 0.75 V
  • V i1 = –Vi2 = 1.00 V
Show Answer
15. A practical op-amp has very ________ input impedance, very ________ output impedance, very ________ open-loop voltage gain, and a ________ bandwidth.
  • high, low, high, wide
  • high, high, low, narrow
  • low, high, high, wide
  • low, low, low, wide
Show Answer
16. What is the level of the roll-off in most op-amps?
  • –6 dB / decade
  • –20 dB / octave
  • –6 dB / decade or –20 dB / octave
  • –20 dB / decade or –6 dB / octave
Show Answer
17. The input offset voltage drift is a parameter directly related to VOS and ________.
  • ID
  • power dissipation
  • temperature
  • phase shift
Show Answer
18. What is the difference voltage if the inputs are an ideal opposite signal?
  • The differential gain times twice the input signal.
  • The differential gain times the input signal.
  • The common-mode gain times twice the input signal.
  • The common-mode gain times the input signal.
Show Answer
19. Which of the following circuit conditions affect(s) the output offset voltage of an op-amp?
  • An input offset voltage, VIO
  • An input offset current, IIO
  • Both an input offset voltage, VIO and an input offset current, IIO
  • None of the above
Show Answer
20. A(n) ________ amplifier configuration has a higher input impedance and a lower output impedance than the op-amp itself.
  • non-inverting
  • inverting
  • voltage-follower
  • [NIL]
Show Answer
Electronics
Questions and Answers for Competitive Exams Various Entrance Test