Practice Interfacing To The Analog World Multiple Choice Questions with Answers Quiz-2

Q.1.

Which of the following characterizes an analog quantity?

Discrete levels represent changes in a quantity.
Its values follow a logarithmic curve.
It can be described with a finite number of steps.
It has a continuous set of values over a given range.

Q.2.

Which of the following characterizes an analog quantity?

Discrete levels represent changes in a quantity.
Its values follow a logarithmic response curve.
It can be described with a finite number of steps.
It has a continuous set of values over a given range.

Q.3.

If the range of output voltage of a 6-bit DAC is 0 to 15 volts, what is the step voltage of the output?

0.117 volt/step
0.234 volt/step
2.13 volts/step
4.26 volts/step

Q.4.

Inaccurate A/D conversion may be due to:

constant analog input voltage
linear ramp usage
intermittent counter inputs
faulty sample-and-hold circuitry

Q.5.

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.

31%, 4 bits
3.23%, 4 bits
31%, 5 bits
3.23%, 5 bits

Q.6.

What is the resolution of a D/A converter?

the comparison between the actual output of the converter and its expected output
the reciprocal of the number of discrete steps in the D/A output
the deviation between the ideal straight-line output and the actual output of the converter
the ability to resolve between forward and reverse steps when sequenced over its entire range

Q.7.

What is the purpose of a sample-and-hold circuit?

To keep temporary memory
To hold a voltage constant so an ADC has time to produce an output
To hold a voltage constant so a DAC has time to produce an output
To hold data after a multiplexer has selected an output

Q.8.

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

complex circuit
high cost
very slow

Q.9.

Three characteristics of op amps make them almost ideal amplifiers: very high input impedance, very low impedance, and ________.

very high voltage gain
unlimited bandwidth
a low slew rate
very high current gain

Q.10.

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

8.33
0.049
0.000488
0.083

Q.11.

Why is a binary-weighted DAC usually limited to 4-bit binary conversion?

too many pins on the IC
too many op amps needed
too many different values of capacitors
too many different values of resistors

Q.12.

A 4-bit stairstep-ramp A/D converter has a clock frequency of 100 kHz and a maximum input of 10 V, and has 6 V applied to the input. The conversion time will be ________.

10 microseconds
160 microseconds
90 microseconds
6250 seconds

Q.13.

A counter-ramp ADC uses a comparator to compare the input voltage with ________.

a binary number
the output of a counter
the output of a DAC
a voltage divider network

Q.14.

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

flash
synchronous
comparator
asynchronous

Q.15.

Sample-and-hold circuits in A/D converters are designed to:

sample and hold the output of the binary counter during the conversion process
stabilize the comparator's threshold voltage during the conversion process
stabilize the input analog signal during the conversion process
sample and hold the D/A converter staircase waveform during the conversion process

Q.16.

What circuitry is on an ADC0808 IC?

A multiplexer
An ADC
A 3-bit select input code
All of the above

Q.17.

What is the resolution of a D/A converter?

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

Q.18.

A major application for DSP is in ________ and ________ of analog signals.

sending, receiving
digitizing, weighting
filtering, conditioning
leveling, translating

Q.19.

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

flash
synchronous
comparator
asynchronous

Q.20.

A binary-weighter resistor DAC is practical only up to a resolution of ________.

10 bits
2 bits
8 bits
4 bits

Q.21.

________ ADCs have a fixed value of conversion time that is not dependent on the value of the analog input.

Substandard
Dual
Recessive-approximation
Successive-approximation

Q.22.

________ ADCs use no clock signal, because there is no timing or sequencing required.

Actuator
Dual
Flash
Bipolar

Q.23.

________ ADCs use no clock signal, because there is no timing or sequencing required.

Actuator
Dual
Flash
Bipolar

Q.24.

If the range of output voltage of a 6-bit DAC is 0 to 15 volts, what is the step voltage of the output?

0.117 volt/step
0.234 volt/step
2.13 volts/step
4.26 volts/step

Q.25.

Sample-and-hold circuits in A/D converters are designed to:

sample and hold the output of the binary counter during the conversion process
stabilize the comparator's threshold voltage during the conversion process
stabilize the input analog signal during the conversion process
sample and hold the D/A converter staircase waveform during the conversion process

Q.26.

What is the main disadvantage of the counter-ramp A/D converter?

It requires a counter.
The counter must count up from zero at the beginning of each conversion sequence, and the conversion time will vary depending on the input voltage.
It requires a precision clock in order for the conversion to be reliable.
The counter must count up from zero at the beginning of each conversion sequence, and the conversion time will vary depending on the input voltage. It requires a precision clock in order for the conversion to be reliable.

Q.27.

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

12.8 ms
6.4 ms
0.05 ms
0.4 ms

Q.28.

The fastest analog-to-digital converter is the ________.

counter ADC
successive-approximation ADC
dual slope ADC
parallel ADC

Q.29.

The DSO ________, ________, and ________ analog waveforms.

filters, conditions, sends
levels, stores, weighs
sends, receives, translates
digitizes, stores, displays

Q.30.

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

flash
synchronous
comparator
asynchronous

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