Special-Purpose Op-Amp Circuits 2 Questions and Answers

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Q1
The voltage gain of a basic instrumentation amplifier is set by a(n)
  • A diode
  • B capacitor.
  • C resistor
  • D inductor.
Answer: Option C
Q2
A basic ________ amplifier is formed by three op-amps and seven resistors.
  • A instrumentation
  • B isolation
  • C log
  • D antilog
Answer: Option A
Q3
Instrumentation amplifiers are normally used to measure
  • A small differential signal voltages.
  • B signals superimposed on a common-mode voltage often much larger than the signal voltage.
  • C both of the above
  • D none of the above
Answer: Option C
Q4
A(n) ________ amplifier is a differential voltage-gain device that amplifies the difference between the voltages existing at its two input terminals.
  • A instrumentation
  • B isolation
  • C operational transconductance
  • D log
Answer: Option A
Q5
The main purpose of an instrumentation amplifier is to amplify ________ signals that are riding on ________ common-mode voltages.
  • A small, small
  • B small, large
  • C large, small
  • D large, large
Answer: Option B
Q6
A log amplifier may use the ________ junction of a BJT in the feedback loop.
  • A base-collector
  • B base-emitter
  • C emitter-collector
  • D emitter-ground
Answer: Option B
Q7
A current-to-voltage converter produces a
  • A constant output voltage for a variable input current.
  • B variable output voltage for a constant input current.
  • C proportional output voltage for a variable input current.
  • D proportional output current for a variable input voltage.
Answer: Option C
Q8
A log amplifier has ________ in the feedback loop.
  • A a diode
  • B a BJT
  • C a resistor
  • D either a diode or a BJT
Answer: Option D
Q9
What is (are) the principal area(s) of application for isolation amplifiers?
  • A medical
  • B power plant
  • C automation
  • D all of the above
Answer: Option D
Q10
A constant-current source delivers a load current that
  • A remains constant when the load resistance changes
  • B varies with load resistance.
  • C varies inversely with load resistance.
  • D varies inversely with input voltage.
Answer: Option A

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