135 + Mcqs in Interfacing To The Analog World Page 1 McqOptions

1.	If the least significant bit (LSB) of a four-bit binary-weighted resistor D/A converter connects to a 200 resistor, then the resistor needed for the next bit is 100 .
A.	True
B.	False
Answer» B. False

Discussion

2.	The current across the MSB "rung" of a 4-bit /2 ladder DAC if the reference voltage is 5 v and R is 8 is 625 A.
A.	True
B.	False
Answer» C.

Discussion

3.	An AD7524 is an eight-bit D/A converter that uses an /2 ladder network.
A.	True
B.	False
Answer» B. False

Discussion

4.	A 4-bit /2 D/A converter has a reference of 5 V. What is the analog output for the input code 0101?
A.	3.125 V
B.	0.3125 V
C.	0.78125 V
D.	–3.125 V
Answer» E.

Discussion

5.	What is the major advantage of the /2 ladder D/A converter as compared to a binary-weighted D/A converter?
A.	It has fewer parts for the same number of inputs.
B.	It is much easier to analyze its operation.
C.	It uses only two different resistor values.
D.	The virtual ground is eliminated and the circuit is therefore easier to understand and troubleshoot.
Answer» D. The virtual ground is eliminated and the circuit is therefore easier to understand and troubleshoot.

Discussion

6.	What is the major advantage of the /2 ladder DAC as compared to a binary-weighted-input DAC?
A.	It has fewer parts for the same number of inputs.
B.	It is much easier to analyze its operation.
C.	It uses only two different resistor values.
D.	The virtual ground is eliminated and the circuit is therefore easier to understand and troubleshoot.
Answer» D. The virtual ground is eliminated and the circuit is therefore easier to understand and troubleshoot.

Discussion

7.	The primary disadvantage of the flash A/D converter is the large number of comparators required.
A.	1
B.
Answer» B.

Discussion

8.	Flash A/D converters depend on an input clock pulse to perform each conversion.
A.	1
B.
Answer» C.

Discussion

9.	In a digital storage scope, when memory is full, the next data point is lost.
A.	1
B.
Answer» C.

Discussion

10.	The current across the MSB "rung" of a 4-bit R/2R ladder DAC if the reference voltage is 5 v and R is 8 is 625 A.
A.	1
B.
Answer» C.

Discussion

11.	Linearity error is the maximum deviation in step size from the ideal step size.
A.	1
B.
Answer» B.

Discussion

12.	In a binary-weighted D/A converter the sum of all the currents from the binary weighted resistors flows through the operational amplifier.
A.	1
B.
Answer» C.

Discussion

13.	When a DAC output shows a deviation of the measured step size from the ideal step size, this error is called nonlinearity.
A.	1
B.
Answer» B.

Discussion

14.	An operational amplifier is used as a comparator.
A.	1
B.
Answer» B.

Discussion

15.	When the inputs of a four-bit D/A converter are connected to a binary up-counter, the output looks like an upward sloping line.
A.	1
B.
Answer» C.

Discussion

16.	The number of binary bits at the input of a DAC or the output of an ADC is known as ________.
A.	accuracy
B.	linearity
C.	resolution
D.	monotonicity
Answer» D. monotonicity

Discussion

17.	When analog inputs from several sources are to be converted, a multiplexing technique can be used so that one ADC may be time-shared.
A.	1
B.
Answer» B.

Discussion

18.	If the least significant bit (LSB) of a four-bit binary-weighted resistor D/A converter connects to a 200 resistor, then the resistor needed for the next bit is 100 .
A.	1
B.
Answer» B.

Discussion

19.	A summing op-amp can be used for DAC.
A.	1
B.
Answer» B.

Discussion

20.	Two characteristics of ideal operational amplifiers are very high input impedance and very high voltage gain.
A.	1
B.
Answer» B.

Discussion

21.	The main advantage of the tracking A/D converter over the stairstep-ramp A/D converter is that ________.
A.	it does not require a counter
B.	it uses an up/down counter to indicate the polarity of the input voltage
C.	it uses an up/down counter to measure both positive and negative voltages
D.	it is faster
Answer» E.

Discussion

22.	For each bit that is added to a digital ramp ADC, the conversion time ________.
A.	doubles
B.	triples
C.	decreases by one-third
D.	decreases by one-half
Answer» B. triples

Discussion

23.	A light bulb and a switch are examples of an analog circuit.
A.	1
B.
Answer» C.

Discussion

24.	The AD7524, a CMOS IC available from several IC manufacturers, is an eight-bit D/A converter that uses a(n) ________.
A.	sample-and-hold circuit
B.	R/2R ladder network
C.	multiplexer
D.	10 s clock
Answer» C. multiplexer

Discussion

25.	A major application for DSP is in ________ and ________ of analog signals.
A.	sending, receiving
B.	digitizing, weighting
C.	filtering, conditioning
D.	leveling, translating
Answer» D. leveling, translating

Discussion

26.	________ ADCs use no clock signal, because there is no timing or sequencing required.
A.	Actuator
B.	Dual
C.	Flash
D.	Bipolar
Answer» D. Bipolar

Discussion

27.	A data acquisition system may communicate via two common buses: the data bus and the control bus.
A.	1
B.
Answer» B.

Discussion

28.	A binary-weighter resistor DAC is practical only up to a resolution of ________.
A.	10 bits
B.	2 bits
C.	8 bits
D.	4 bits
Answer» E.

Discussion

29.	The output of an analog-to-digital converter is a voltage level.
A.	1
B.
Answer» C.

Discussion

30.	D/A conversion is the process of taking a voltage or current and converting it to a digital code.
A.	1
B.
Answer» C.

Discussion

31.	It is possible to develop more than 16 different analog levels using 4-bit resolution.
A.	1
B.
Answer» C.

Discussion

32.	The figure given below represents a ________.
A.	successive-approximation A/D converter
B.	dual-slope A/D converter
C.	tracking A/D converter
D.	dual-approximation D/A comparator
Answer» B. dual-slope A/D converter

Discussion

33.	________ DACs produce both positive and negative output values.
A.	Tristate
B.	Double
C.	Bipolar
D.	Unilateral
Answer» D. Unilateral

Discussion

34.	The time required to complete a conversion cycle is called conversion time.
A.	1
B.
Answer» B.

Discussion

35.	An AD7524 is an eight-bit D/A converter that uses an R/2R ladder network.
A.	1
B.
Answer» B.

Discussion

36.	A simultaneous, multiple comparator, or flash converter uses parallel encoding.
A.	1
B.
Answer» B.

Discussion

37.	A D/A converter changes things such as temperature variations into digital quantities.
A.	1
B.
Answer» C.

Discussion

38.	A DAC is ________ if its output increases as the binary input increments from one value to the next.
A.	monotonic
B.	self adjusting
C.	accurate
D.	broken
Answer» B. self adjusting

Discussion

39.	A digital voltmeter converts an analog voltage to its ________ representation.
A.	BCD-code
B.	decimal
C.	digital
D.	alias
Answer» B. decimal

Discussion

40.	A CD player probably uses a sigma/delta D/A converter.
A.	1
B.
Answer» B.

Discussion

41.	An eight-bit D/A converter has a resolution of 0.125.
A.	1
B.
Answer» C.

Discussion

42.	Voltage-to-frequency ADC is more complicated than other ADCs.
A.	1
B.
Answer» C.

Discussion

43.	To be useful, A/D or D/A converters must have meaningful representation of the analog quantity and a digital representation and the digital quantity as an analog representation.
A.	1
B.
Answer» B.

Discussion

44.	The fastest analog-to-digital converter is the ________.
A.	counter ADC
B.	successive-approximation ADC
C.	dual slope ADC
D.	parallel ADC
Answer» E.

Discussion

45.	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» E.

Discussion

46.	A(n) ________ converts an analog input to a digital output.
A.	ADC
B.	DAC
C.	flash converter
D.	bipolar converter
Answer» B. DAC

Discussion

47.	A DAC is monotonic if its output increases as its binary input is incremented from one value to the next.
A.	1
B.
Answer» B.

Discussion

48.	A counter-ramp ADC stops counting when ________.
A.	the input voltage equals the DAC staircase voltage
B.	the counter reaches a maximum count
C.	the input voltage equals 5 volts
D.	the DAC staircase voltage equals 5 volts
Answer» B. the counter reaches a maximum count

Discussion

49.	In a counter-ramp A/D converter, the end-of-conversion line must be tied back to the clear input of the counter to change the circuit to perform continuous conversions.
A.	1
B.
Answer» B.

Discussion

50.	A signal ________ is produced by sampling the signal at a rate less than the minimum rate identified by Nyquist.
A.	Nyquist
B.	sampling frequency
C.	basis
D.	alias
Answer» E.

Discussion

Explore topic-wise MCQs in Digital Electronics.

If the least significant bit (LSB) of a four-bit binary-weighted resistor D/A converter connects to a 200 resistor, then the resistor needed for the next bit is 100 .

The current across the MSB "rung" of a 4-bit /2 ladder DAC if the reference voltage is 5 v and R is 8 is 625 A.

An AD7524 is an eight-bit D/A converter that uses an /2 ladder network.

A 4-bit /2 D/A converter has a reference of 5 V. What is the analog output for the input code 0101?

What is the major advantage of the /2 ladder D/A converter as compared to a binary-weighted D/A converter?

What is the major advantage of the /2 ladder DAC as compared to a binary-weighted-input DAC?

The primary disadvantage of the flash A/D converter is the large number of comparators required.

Flash A/D converters depend on an input clock pulse to perform each conversion.

In a digital storage scope, when memory is full, the next data point is lost.

The current across the MSB "rung" of a 4-bit R/2R ladder DAC if the reference voltage is 5 v and R is 8 is 625 A.

Linearity error is the maximum deviation in step size from the ideal step size.

In a binary-weighted D/A converter the sum of all the currents from the binary weighted resistors flows through the operational amplifier.

When a DAC output shows a deviation of the measured step size from the ideal step size, this error is called nonlinearity.

An operational amplifier is used as a comparator.

When the inputs of a four-bit D/A converter are connected to a binary up-counter, the output looks like an upward sloping line.

The number of binary bits at the input of a DAC or the output of an ADC is known as ________.

When analog inputs from several sources are to be converted, a multiplexing technique can be used so that one ADC may be time-shared.

If the least significant bit (LSB) of a four-bit binary-weighted resistor D/A converter connects to a 200 resistor, then the resistor needed for the next bit is 100 .

A summing op-amp can be used for DAC.

Two characteristics of ideal operational amplifiers are very high input impedance and very high voltage gain.

The main advantage of the tracking A/D converter over the stairstep-ramp A/D converter is that ________.

For each bit that is added to a digital ramp ADC, the conversion time ________.

A light bulb and a switch are examples of an analog circuit.

The AD7524, a CMOS IC available from several IC manufacturers, is an eight-bit D/A converter that uses a(n) ________.

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

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

A data acquisition system may communicate via two common buses: the data bus and the control bus.

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

The output of an analog-to-digital converter is a voltage level.

D/A conversion is the process of taking a voltage or current and converting it to a digital code.

It is possible to develop more than 16 different analog levels using 4-bit resolution.

The figure given below represents a ________.

________ DACs produce both positive and negative output values.

The time required to complete a conversion cycle is called conversion time.

An AD7524 is an eight-bit D/A converter that uses an R/2R ladder network.

A simultaneous, multiple comparator, or flash converter uses parallel encoding.

A D/A converter changes things such as temperature variations into digital quantities.

A DAC is ________ if its output increases as the binary input increments from one value to the next.

A digital voltmeter converts an analog voltage to its ________ representation.

A CD player probably uses a sigma/delta D/A converter.

An eight-bit D/A converter has a resolution of 0.125.

Voltage-to-frequency ADC is more complicated than other ADCs.

To be useful, A/D or D/A converters must have meaningful representation of the analog quantity and a digital representation and the digital quantity as an analog representation.

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

The primary disadvantage of the simultaneous A/D converter is ________.

A(n) ________ converts an analog input to a digital output.

A DAC is monotonic if its output increases as its binary input is incremented from one value to the next.

A counter-ramp ADC stops counting when ________.

In a counter-ramp A/D converter, the end-of-conversion line must be tied back to the clear input of the counter to change the circuit to perform continuous conversions.

A signal ________ is produced by sampling the signal at a rate less than the minimum rate identified by Nyquist.

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