Interfacing to the Analog World - General Questions (2)

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Interfacing to the Analog World - General Questions

The primary disadvantage of the simultaneous A/D converter is:

A.	that it requires the input voltage to be applied to the inputs simultaneously
B.	the long conversion time required
C.	the large number of output lines required to simultaneously decode the input voltage
D.	the large number of comparators required to represent a reasonable sized binary number

Answer: Option D

Explanation:

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10.

A simultaneous A/D converter is also known as a(n) ________ A/D converter.

A.	flash
B.	synchronous
C.	comparator
D.	asynchronous

Answer: Option A

Explanation:

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11.

A certain digital-to-analog converter has a step size of 0.25 V and a full-scale output of 7.75 V. Determine the percent of resolution and the number of input binary bits.

A.	31%, 4 bits
B.	3.23%, 4 bits
C.	31%, 5 bits
D.	3.23%, 5 bits

Answer: Option D

Explanation:

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12.

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?

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.

Answer: Option B

Explanation:

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13.

What is the maximum conversion time for a counter-ramp ADC with 8-bit resolution and a clock frequency of 20 kHz?

A.	12.8 ms
B.	6.4 ms
C.	0.05 ms
D.	0.4 ms

Answer: Option A

Explanation:

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14.

Referring to the given figure, what appears to be wrong, if anything, with the output of the D/A converter?

mcq11_1016_1

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.

Answer: Option C

Explanation:

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15.

What is the disadvantage to using a counter-ramp type ADC?

A.	complex circuit
B.	high cost
C.	very slow

Answer: Option C

Explanation:

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16.

What type of DAC is shown below?

mcq15_1010_1 (2)

A.	binary-weighted
B.	R-2R ladder

Answer: Option B

Explanation:

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Interfacing to the Analog World - General Questions (2)

Interfacing to the Analog World - General Questions

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