Interfacing to the Analog World - General Questions (4)

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Interfacing to the Analog World - General Questions

25.

What is the maximum conversion time for an 8-bit successive-approximation ADC with a clock frequency of 20 kHz?

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

Answer: Option D

Explanation:

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26.

What circuitry is on an ADC0808 IC?

A.	A multiplexer
B.	An ADC
C.	A 3-bit select input code
D.	All of the above

Answer: Option D

Explanation:

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27.

What is the resolution, in percent, of a 12-bit DAC?

A.	8.33
B.	0.049
C.	0.000488
D.	0.083

Answer: Option B

Explanation:

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28.

Inaccurate A/D conversion may be due to:

A.	constant analog input voltage
B.	linear ramp usage
C.	intermittent counter inputs
D.	faulty sample-and-hold circuitry

Answer: Option D

Explanation:

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29.

What function is performed by the block labeled X in the given figure?

mcq11_1007_1

A.	Analog-to-digital conversion
B.	Digital-to-analog conversion
C.	Audio ON/OFF control
D.	Power supply for the audio amplifier

Answer: Option B

Explanation:

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30.

An analog quantity varies from 0–7 V and is input to a 6-bit A/D converter. What analog value is represented by each step on the digital output?

A.	0.111 V
B.	1.17 V
C.	0.109 V
D.	0.857 V

Answer: Option A

Explanation:

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31.

Which of the equations below expresses the voltage gain relationship for an operational amplifier?

A.	Vout = Vin/Av
B.	Vout/Vin = Rout/Rin
C.	Vin/Vout = Rout/Rin
D.	Vout/Vin = â€“Rf/Rin

Answer: Option D

Explanation:

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32.

What is the accuracy of a D/A converter?

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 converter's ability to resolve between forward and reverse steps when sequenced over its entire range of inputs.
D.	It is the deviation between the ideal straight-line output and the actual output of the converter.

Answer: Option B

Explanation:

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Interfacing to the Analog World - General Questions (4)

Interfacing to the Analog World - General Questions

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