2291 + Mcqs in Digital Electronics Page 35 McqOptions

1701.	A data acquisition system may communicate via two common buses: the data bus and the control bus.
A.	True
B.	False
Answer» B. False

Discussion

1702.	Flash A/D converters depend on an input clock pulse to perform each conversion.
A.	True
B.	False
Answer» C.

Discussion

1703.	Resolution in the analog output of a DAC is primarily dependent on the number of input binary bits.
A.	True
B.	False
Answer» B. False

Discussion

1704.	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

1705.	A summing op-amp can be used for DAC.
A.	True
B.	False
Answer» B. False

Discussion

1706.	The time required to complete a conversion cycle is called conversion time.
A.	True
B.	False
Answer» B. False

Discussion

1707.	Electrical quantities can be interpreted without conditioning by a digital computer.
A.	True
B.	False
Answer» C.

Discussion

1708.	Linearity error is the maximum deviation in step size from the ideal step size.
A.	True
B.	False
Answer» B. False

Discussion

1709.	When four 1s are taken as a group on a Karnaugh map, the number of variables eliminated from the output expression is ________.
A.	1
B.	2
C.	3
D.	4
Answer» C. 3

Discussion

1710.	In Boolean algebra, the word "literal" means ________.
A.	a product term
B.	all the variables in a Boolean expression
C.	the inverse function
D.	a variable or its complement
Answer» E.

Discussion

1711.	The amount of deviation of the measured step size from the ideal step size is a measure of linearity.
A.	True
B.	False
Answer» B. False

Discussion

1712.	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.	True
B.	False
Answer» B. False

Discussion

1713.	An AD7524 is an eight-bit D/A converter that uses an R/2R ladder network.
A.	True
B.	False
Answer» B. False

Discussion

1714.	Voltage-to-frequency ADC is more complicated than other ADCs.
A.	True
B.	False
Answer» C.

Discussion

1715.	A digital voltmeter converts an analog voltage to its ________ representation.
A.	BCD-code
B.	decimal
C.	digital
D.	alias
Answer» B. decimal

Discussion

1716.	________ ADCs have a fixed value of conversion time that is not dependent on the value of the analog input.
A.	Substandard
B.	Dual
C.	Recessive-approximation
D.	Successive-approximation
Answer» E.

Discussion

1717.	The DSO ________, ________, and ________ analog waveforms.
A.	filters, conditions, sends
B.	levels, stores, weighs
C.	sends, receives, translates
D.	digitizes, stores, displays
Answer» D. digitizes, stores, displays

Discussion

1718.	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

1719.	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

1720.	________ DACs produce both positive and negative output values.
A.	Tristate
B.	Double
C.	Bipolar
D.	Unilateral
Answer» D. Unilateral

Discussion

1721.	A counter-ramp ADC uses a comparator to compare the input voltage with ________.
A.	a binary number
B.	the output of a counter
C.	the output of a DAC
D.	a voltage divider network
Answer» D. a voltage divider network

Discussion

1722.	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

1723.	A simultaneous A/D converter is also known as a(n) ________ A/D converter.
A.	flash
B.	synchronous
C.	comparator
D.	asynchronous
Answer» B. synchronous

Discussion

1724.	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

1725.	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

1726.	The input of an analog-to-digital converter is ________.
A.	a voltage level
B.	a clock pulse
C.	a binary number
D.	any of the above
Answer» B. a clock pulse

Discussion

1727.	Two characteristics of ideal operational amplifiers are very high input impedance and very high voltage gain.
A.	True
B.	False
Answer» B. False

Discussion

1728.	A major drawback in using ECL logic circuits in conjunction with TTL and MOS circuits is its negative supply voltages and logic levels.
A.	True
B.	False
Answer» B. False

Discussion

1729.	Due to the extremely low power requirements of CMOS logic circuits, any number of CMOS and TTL gates can be interconnected.
A.	True
B.	False
Answer» C.

Discussion

1730.	The maximum current for a LOW output on a standard TTL gate is 100 A.
A.	True
B.	False
Answer» C.

Discussion

1731.	Power-supply decoupling uses a radio-frequency capacitor to short out high frequency spikes.
A.	True
B.	False
Answer» B. False

Discussion

1732.	Integrated injection logic offers high component density and is easier to fabricate than TTL.
A.	True
B.	False
Answer» B. False

Discussion

1733.	The noise immunity of a logic circuit refers to the circuit's ability to tolerate noise by causing spurious charges in the output voltage.
A.	True
B.	False
Answer» C.

Discussion

1734.	The time it takes for a square wave to go from 10% to 90% of its voltage level is called propagation delay.
A.	True
B.	False
Answer» C.

Discussion

1735.	When the outputs of several standard TTL gates are connected together, the gate outputs produce more fan-out.
A.	True
B.	False
Answer» C.

Discussion

1736.	A common means for measuring and comparing the overall performance of an IC family is the speed-power product.
A.	True
B.	False
Answer» B. False

Discussion

1737.	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 ________.
A.	10 microseconds
B.	160 microseconds
C.	90 microseconds
D.	6250 seconds
Answer» D. 6250 seconds

Discussion

1738.	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

1739.	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

1740.	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

1741.	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

1742.	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

1743.	A(n) ________ converts an analog input to a digital output.
A.	ADC
B.	DAC
C.	flash converter
D.	bipolar converter
Answer» B. DAC

Discussion

1744.	It is possible to develop more than 16 different analog levels using 4-bit resolution.
A.	True
B.	False
Answer» C.

Discussion

1745.	A simultaneous, multiple comparator, or flash converter uses parallel encoding.
A.	True
B.	False
Answer» B. False

Discussion

1746.	A DAC is monotonic if its output increases as its binary input is incremented from one value to the next.
A.	True
B.	False
Answer» B. False

Discussion

1747.	An operational amplifier is used as a comparator.
A.	True
B.	False
Answer» B. False

Discussion

1748.	By applying De Morgan's theorem to a NOR gate, two identical truth tables can be produced.
A.	True
B.	False
Answer» B. False

Discussion

1749.	Five-variable Karnaugh maps are impossible.
A.	True
B.	False
Answer» C.

Discussion

1750.	A Karnaugh map is similar to a truth table because it presents all the possible values of input variables and the resulting output of each value.
A.	True
B.	False
Answer» B. False

Discussion

Explore topic-wise MCQs in Engineering.

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

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

Resolution in the analog output of a DAC is primarily dependent on the number of input binary bits.

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.

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

Electrical quantities can be interpreted without conditioning by a digital computer.

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

When four 1s are taken as a group on a Karnaugh map, the number of variables eliminated from the output expression is ________.

In Boolean algebra, the word "literal" means ________.

The amount of deviation of the measured step size from the ideal step size is a measure of linearity.

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

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

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

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

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

The DSO ________, ________, and ________ analog waveforms.

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

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

________ DACs produce both positive and negative output values.

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

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

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

The figure given below represents a ________.

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

The input of an analog-to-digital converter is ________.

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

A major drawback in using ECL logic circuits in conjunction with TTL and MOS circuits is its negative supply voltages and logic levels.

Due to the extremely low power requirements of CMOS logic circuits, any number of CMOS and TTL gates can be interconnected.

The maximum current for a LOW output on a standard TTL gate is 100 A.

Power-supply decoupling uses a radio-frequency capacitor to short out high frequency spikes.

Integrated injection logic offers high component density and is easier to fabricate than TTL.

The noise immunity of a logic circuit refers to the circuit's ability to tolerate noise by causing spurious charges in the output voltage.

The time it takes for a square wave to go from 10% to 90% of its voltage level is called propagation delay.

When the outputs of several standard TTL gates are connected together, the gate outputs produce more fan-out.

A common means for measuring and comparing the overall performance of an IC family is the speed-power product.

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 ________.

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

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

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

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

A counter-ramp ADC stops counting when ________.

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

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

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

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

An operational amplifier is used as a comparator.

By applying De Morgan's theorem to a NOR gate, two identical truth tables can be produced.

Five-variable Karnaugh maps are impossible.

A Karnaugh map is similar to a truth table because it presents all the possible values of input variables and the resulting output of each value.

The DSO , , and analog waveforms.

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