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WorksheetsDigital II UNIT 3,4,5 Quiz
Total questions: 86
Worksheet time: 43mins
A DAC is a
digital-to-analog computer
digital analysis calculator
data accumulation converter
digital-to-analog converter
A type of Error associated with digital to analog converters (DACs) is:
nonmonotonic error
incorrect output codes
offset error
nonmonotic and offset error
In troubleshooting a DAC, we check its performance characteristics, such as______________
nonmonotonicity
differential nonlinearity
low and high gain
all of the above
What is gain error in a DAC
missing codes
error in the slope of the output staircase waveform
more or less input voltage is required for the first step than what is specified
None
A Binary weighted digital to analog converter has an input resistor of 100kΩ. What will be current through the resistor, if the resistor is connected to a 5V Source?
50μA
5mA
500μA
50mA
In a binary weighted DAC, the lowest-value resistor corresponds to
the highest binary weighted input
the lowest binary weighted input
the first input
the last input
As Compared to binary weighted digital to analog DAC converter , the major advantage of the R/2R ladder digital to analog (DAC) is
It only uses two different resistor values
it has a fewer part of the same number of inputs
Its Operation is much easier to analyse
The Virtual Ground is elimated and the circuit is therefore easier to understand and troubleshoot
Which term applies to the maintaining of a given signal level until the next sampling
Holding
Aliasing
shannon frequency sampling
stair-stepping
In analog to digital converter (ADCs) sample - and - hold circuits are designed to
Sample and hold the output of the binary counter during the conversion process
stabilize the comparator threshold voltage during the comparison process
stabilize the input analog signal during the conversion process
sample and hold the D/A converter staircase waveform during the conversion process
What is the Purpose of Sample and Hold Circuit?
To keep temporary memory
Tp 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 multiplexer has selected an output
The most common ADC seen in telecommunications based on audio signals is
flash ADC
successive approximation ADC
sigma-delta ADC
dual slope ADC
Identify from the following performance parameter of ADC in which suits the definition of no. of samples per second.
Aliasing
Quantization Error
Resolution
Sampling Frequency
The quantization process
converts the sample-and-hold output to binary code
converts a sample impulse to a level
converts a sequence of binary codes to a reconstructed analog signal
filters out unwanted frequencies before sampling takes place
Aliasing results in
oversampling
undersampling
guard-band formation
perfect sampling
The dual slope analog to digital conver finds extensive use in _____
digital voltmeter
function generators
frequency counters
all of the above
A digital voltmeter uses a
flash ADC
successive approximation ADC
sigma-delta ADC
dual-slope ADC
What is the Primary disadvantage of the Flash analog to digital converter (ADC)?
It requires the input voltage to be applied to the inputs simultaneously
a long conversion time is required
a large number of output lines is required to simultaneously decode the input voltage
a large number of comparators is required to represent a resonable sized binary number
What is the Conversion time of flash converter?
20s
10s
1s
The Conversion takes place continuously
In a flash Analog to Digital convertor,the output of each comparator is connected to an input of a ______________
decoder
priority encoder
multiplexer
demultiplexer
The throughput of a flash ADC is measured in
displacement per second
distance per second
samples per minute
samples per second
The main advantage of the successive - approximation A/D converter over the counter - ramp A/D converter is its:
more complec circuitry
less complex circuitry
longer conversion time
shorter conversion time
The ADC0808 is an example of a _____________
Single -slope analog to digital converter
dual slope analog to digital converter
digital ramp analog to digital converter
successive approximation analog to digital converter
Memory is a/an ___________
Device to collect data from other computer
Block of data to keep data separately
Indispensable part of computer
Device to connect through all over the world
A flip flop stores __________
single bit of information
two bits of information
four bits of information
eight bits of information
A register is able to hold __________ of information
bit
word
nibble
double word
Which of the following parameter of memory defines the section of memory in a single memory array?
Memory Location
Memory Address
Memory Bank
Memory Rank
Which of the following parameter of memory defines the group of chips that make up a memory module that stores data in units such as words or bytes?
Memory Location
Memory Address
Memory Bank
Memory Rank
Which of the following parameter of memory defines the maximum number of bits that can be read or written into the memory at a time?
Memory Location
Memory Address
Memory Bank
Unit of Transfer
Which of the following parameter of memory defines the time taken by RAM to complete read/write operation from the instant that an address is sent to the memory?
Access Time
Memory Cycle Time
Transfer Rate
Unit of Transfer
Which of the following parameter of memory defines the sum of access time & additional time required before a second access can commence in case of RAM ONLY?
Access Time
Memory Cycle Time
Transfer Rate
Unit of Transfer
Data stored in an electronic memory cell can be accessed at random and on demand using __________
Memory Addressing
Direct Addressing
Indirect Addressing
Control Unit
A ROM is defined as __________
Read Out Memory
Read Once Memory
Read Only Memory
Read One Memory
Why are ROMs called non-volatile memory?
They lose memory when power is removed
They do not lose memory when power is removed
They lose memory when power is supplied
They do not lose memory when power is supplied
Which type of ROM has to be custom built by the factory?
EPROM
EEPROM
Masked ROM
PROM
CD-ROM refers to __________
Floppy disk
Compact Disk-Read Only Memory
Compressed Disk-Read Only Memory
Compressed Disk-Random Access Memory
Which of the following memories are magnetic memory type?
Main Memory
Secondary Memory
Static Memory
Volatile Memory
Which of the following memory is an example of sequential access memory?
Floppy Disk
Hard Disk
Magnetic Type Memory
RAM
The full form of PROM is __________
Previous Read Only Memory
Programmable Read Out Memory
Programmable Read Only Memory
Previous Read Out Memory
Which of following processes matches for Fusing process in PROM?
It is Reversible Process
It is Irreverible Process
It is Synchronous Process
It is Asynchronous Process
Which of the following best describes EPROMs?
EPROMs can be programmed only once
EPROMs can be erased by UV
EPROMs can be erased by shorting all inputs to the ground
EPROMs can be erased electrically
The full form of EPROM is __________
Easy Programmable Read Only Memory
Erasable Programmable Read Only Memory
Eradicate Programmable Read Only Memory
Easy Programmable Read Out Memory
Which type ROM can be used to erase the contents by an electrical signal?
ROM
Masked ROM
EPROM
EEPROM
Which of the following is NOT an application of SRAM?
Computer Cache Memory
Digital Cameras & Cell Phones
LCD Screens
Workstations & Servers
How many no. of transistors are used in fabricating a SRAM Chip?
4
5
6
7
Which of the following operations are performed by SRAM?
Write Operation
Read Operation
Refresh Operation
Both a & b ONLY
Which of the following operations are performed by DRAM?
Write Operation
Read Operation
Refresh Operation
All of the above
Which of the following devices used in fabricating a Dynamic RAM ICs?
Capacitor or MOSFET
FET or JFET
Capacitor or BJT
BJT or MOS
Which of the following features best defines about Dynamic RAM?
High power consumptionLarge storage capacity
Low power consumptionLarge storage capacity
Low power consumptionLess storage capacity
High power consumptionLess storage capacity
What is the disadvantage of MOS capacitor in DRAM?
It can't hold the data till a long period
It doesn't holds the charge till a long period
It is highly densed
It is not flexible
With which of the following two memory devices, NVRAM Chip is formed?
EPROM & DRAM
EPROM & SRAM
EEPROM & DRAM
EEPROM & SRAM
Which of following is the most widely used type of NVRAM?
Flash Memory type
Ferroelectric RAM (FeRAM)
Magneto Resistive RAM (MRAM)
SRAM
Which of the following type of NVRAM stores the information in the form of voltage in a capacitor?
Flash Memory type
Ferroelectric RAM (FeRAM)
Magneto Resistive RAM (MRAM)
SRAM
When both the AND and OR are programmable, such PLDs are known as __________
PAL
PPL
PLA
APL
Which of the following approach in digital circuit design work with fixed functions?
Applications Specific Integrated Circuit (ASIC)
Fixed Function ICs
Programmable Logic Devices (PLDs)
None of the above
Which of the following design approach in digital circuits offers HIGHEST RELIABILITY?
Applications Specific Integrated Circuit (ASIC)
Fixed Function ICs
Programmable Logic Devices (PLDs)
None of the above
Which of the following design approach in digital circuits will NOT provide Design Flexibility?
Applications Specific Integrated Circuit (ASIC)
Fixed Function ICs
Programmable Logic Devices (PLDs)
None of the above
Which of the following design approach in digital circuits will have Design Security Issues?
Applications Specific Integrated Circuit (ASIC)
Fixed Function ICs
Programmable Logic Devices (PLDs)
None of the above
The full form of PLD is __________
Programmable Large Device
Programmable Long Device
Programmable Logic Device
Programmable Lengthy Device
The evolution of PLD began with __________
Externally Programmed ROM
RAM
PROM
EPROM
For reprogrammability, PLDs use __________
PROM
EPROM
CDROM
PLA
Why antifuses are implemented in a PLD?
To protect from high voltage
To increase the memory storage
To implement the programmes
As a switching devices
Which of the following is the type of Factory Programmable Logic Devices?
MPGA
PLA
PAL
CPLD
Which of the following is NOT the type of Field Programmable Logic Devices?
CPLD
PLA
PAL
ROM
The full form of PLA is _____________.
Programmable Loaded Array
Programmable Array Logic
Programmable Logic Array
Programmed Array Logic
Which of the following combination best defines Programmable Logic Array (PLA)?
Fixed AND ArrayFixed OR Array
Fixed AND ArrayProgrammable OR Array
Programmable AND ArrayFixed OR Array
Programmable AND ArrayProgrammable OR Array
PAL refers to ____________
Programmable Array Loaded
Programmable Logic Array
Programmable Array Logic
Programmable AND Logic
Which of the following design versions are NOT available in PAL devices?
One-Time Programmable
UV Erasable Version
Flash Erasable Version
None of the above
Which of the following combination best defines Programmable Array Logic (PAL)?
Fixed AND ArrayFixed OR Array
Fixed AND ArrayProgrammable OR Array
Programmable AND ArrayFixed OR Array
Programmable AND ArrayProgrammable OR Array
If a PAL has been programmed once __________
Its logic capacity is lost
Its outputs are only active HIGH
Its outputs are only active LOW
It cannot be reprogrammed
Which of the following output is generated from PAL circuit?
Sum Term Output ONLY
SOP Term Output
Product Term Output ONLY
POS Term Output
Which of the following is/are the basic element/s of FPGA?
Configuration Logic Block (CLB)
Interconnections
I/O Block
all of the above
FPGA stands for __________
Full Programmable Gate Array
Full Programmable Genuine Array
First Programmable Gate Array
Field Programmable Gate Array
Which of the following is a reprogrammable gate array?
EPROM
FPGA
Both a & b
ROM
How FPGA differs from PLD?
FPGA is slower than PLD
FPGA has high power dissipation
FPGA incorporates logic blocks
None of the above
Which of the following display devices are NOT the type of Digital Displays?
Matrix Displays
CRTs
Numeric Displays
Multiplexed Display
In 7 segment display, how many LEDs are used?
7
8
9
10
In seven segment display, which of the following component is used to construct seven segments?
Capacitor
Diodes
Inductor
LED
In a Common Anode Seven Segment Display, which of the segment LEDs are ON for displaying decimal digit '0'?
Segments a, b, c, d, e are ON
Segments a, b, c, d, e, f are ON
Segments a, b, c are ON
Segments a, c, d, e, f, g are ON
In a Common Anode Seven Segment Display, which of the segment LED will be OFF for displaying decimal digit '6'?
Segment b is OFF
Segment c is OFF
Segment d is OFF
Segment g is OFF
Which of the following type of Alphanumeric Display contains LED aligned in the form of Matrix?
Dot-Matrix Display
Mutliplexed Display
Liquid Crystal Display
Twisted Nematic Display
Which of the following factor is NOT an ADVANTAGE of Multiplexed Displays?
fewer wires are needed for connection
reduced cost
reduced power consumption
None of the above
The full form of LCD is ____________
Liquid Crystal Display
Logical Crystal Display
Logical Crystalline Display
Liquid Crystalline Display
Select the operating voltage range for LCDs.
3 to 15V
10 to 15V
15 to 24V
10 to 32V
What is backplane in LCD?
The ac voltage applied between segment and a common element
The dc voltage applied between segment and a common element
The amount of power consumed
For adjusting the intensity of the LCD
Which of the following type of LCD is used in Watches & Calculators?
Direct Address LCD
Passive Matrix Display
Active Matrix Display
Twisted Nematic Display
Which of following DO NOT describe Active Matrix LCD?
High Contrast
High Resolution
High Viewing Angle
High Cost
