Three characteristics of op amps make them almost ideal amplifiers: very high in

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Question
Three characteristics of op amps make them almost ideal amplifiers: very high input impedance, very low impedance, and ________.
Options
A. very high voltage gain
B. unlimited bandwidth
C. a low slew rate
D. very high current gain

Correct Answer

very high voltage gain

1. Which of the equations below expresses the voltage gain relationship for an operational amplifier?
Options
A. V_out = V_in/A_v
B. V_out/V_in = R_out/R_in
C. V_in/V_out = R_out/R_in
D. V_out/V_in = ?R_f/R_in

5. A test system using the GPIB is being used to monitor a potentially dangerous crash test from a distance of 200 feet. The engineer decides to have you fabricate a special cable, rather than order one, since all the materials are on hand and the tests are already behind schedule. When the tests are run, the test system is erratic and the data is almost useless. What has gone wrong?
Options
A. The engineer is probably not using the correct data format for the specific instruments being used to collect the data.
B. The GPIB cable is too long; a bus extender should be used.
C. The cable should be shielded and properly grounded.
D. The tests themselves probably produced extraneous signals that confused the instruments, resulting in unusable data.

6. What is the resolution of a D/A converter?
Options
A. It is the reciprocal of the number of discrete steps in the D/A output.
B. It is the comparison between the actual output of the converter and its expected output.
C. It is the deviation between the ideal straight-line output and the actual output of the converter.
D. It is the converter's ability to resolve between forward and reverse steps when sequenced over its entire range of inputs.

7. Referring to the given figure, what should the display on the scope look like if the A/D converter is working properly?
Options
A. It should be a circular Lissajous pattern resulting from the simultaneous application of ramps to the vertical and horizontal inputs of the oscilloscope.
B. The pattern should be a straight line across the screen due to the equal but opposite voltages being applied to the scope inputs.
C. A uniform stairstep pattern should be displayed.
D. The scope should display a sequential binary count with the LSB on the left and the MSB on the right side of the display.

8. Referring to the given figure, what appears to be wrong, if anything, with the output of the D/A converter?
Options
A. The input signal is probably noisy.
B. There appears to be some nonlinearity in the scope display.
C. The converter has a nonmonotonic output error.
D. It appears that certain input codes are incorrect; double-check the input coding.

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