11. The main difference between the isolation amplifier and an instrumentation amplifier is
(a) an instrumentation amplifier has an input stage.
(b) an instrumentation amplifier has an output stage.
(c) an instrumentation amplifier has a differential stage.
(d) the input, output, and power supply stages of an isolation amplifier are all electrically isolated from each other.
12. An antilog amplifier has a ________ in series with the input.
(a) BJT
(b) diode
(c) diode or BJT
(d) resistor
13. In logarithmic signal compression,
(a) large and small voltages are compressed equally.
(b) large voltages are compressed more than small voltages.
(c) large voltages are compressed less than smaller voltages.
(d) none of the above
14. What part of the characteristic curve of a diode is useful for log amplifiers?
(a) the log region above 0.7 V
(b) the log region below 0.7 V
(c) the log region between 0 V and 0.7 V
(d) the log region below the zener voltage
15. The log of a number is the
(a) base to which the power must be raised to get that number.
(b) power to which the base must be raised to get that number.
(c) base of that number.
(d) power of that number.
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