2291 + Mcqs in Digital Electronics Page 25 McqOptions

1201.	An octal-to-binary encoder has eight data inputs and encodes an output of ________ bits.
A.	two
B.	three
C.	four
D.	five
Answer» C. four

Discussion

1202.	In an AHDL BCD to binary coded converter, multiplication by 10 is performed by ________.
A.	a multiplication operator
B.	shifting bits
C.	a library function
D.	a variable type
Answer» B. shifting bits

Discussion

1203.	In most modern computers, the transfer of data takes place over a common set of connecting lines called a ________.
A.	data bus
B.	bus line
C.	bus cable
D.	data line
Answer» B. bus line

Discussion

1204.	A typical AHDL comparator follows an algorithm described as ________.
A.	FUNCTION constructs
B.	CASE constructs
C.	IF/ELSE constructs
D.	PROCESS constructs
Answer» D. PROCESS constructs

Discussion

1205.	Another name for a multiplexer is ________.
A.	encoder
B.	decoder
C.	code converter
D.	data selector
Answer» E.

Discussion

1206.	When data input I6 of a 74148 octal-to-binary encoder is active, the data output is ________.
A.	<img src="/_files/images/digital-electronics/digital-systems/fba9_0160a.gif">
B.	<img src="/_files/images/digital-electronics/digital-systems/fba9_0160b.gif">
C.	<img src="/_files/images/digital-electronics/digital-systems/fba9_0160c.gif">
D.	<img src="/_files/images/digital-electronics/digital-systems/fba9_0160d.gif">
Answer» D. <img src="/_files/images/digital-electronics/digital-systems/fba9_0160d.gif">

Discussion

1207.	Output 6 of a 74138 octal decoder is selected when it is enabled by a data input of: A0 = 1 A1 = 1 A2 = 0
A.	True
B.	False
Answer» C.

Discussion

1208.	A circuit that converts some binary code into a singular active output representing its numerical value is a comparator.
A.	True
B.	False
Answer» C.

Discussion

1209.	The maximum output voltage recognized as a LOW by a TTL gate is 2.0 V.
A.	True
B.	False
Answer» C.

Discussion

1210.	Which of the figures in figure (a to d) is equivalent to figure (e)?
A.	a
B.	b
C.	c
D.	d
Answer» D. d

Discussion

1211.	What does the term "random access" mean in terms of memory?
A.	Addresses must be accessed in a specific order.
B.	Any address can be accessed in any order.
Answer» C.

Discussion

1212.	A four-line multiplexer must have as inputs four data inputs and two select inputs.
A.	True
B.	False
Answer» B. False

Discussion

1213.	In HDL, a process is usually thought of as a wire connecting two points in a circuit.
A.	True
B.	False
Answer» C.

Discussion

1214.	A demultiplexer is a device that converts some code to a recognizable number or character.
A.	True
B.	False
Answer» C.

Discussion

1215.	The original Pentium was the first CPU to feature separate data and instruction caches.
A.	True
B.	False
Answer» B. False

Discussion

1216.	A NOR gate and an OR gate operate in exactly the same way.
A.	True
B.	False
Answer» C.

Discussion

1217.	Synchronous binary counters can only be used for the application of timing of digital systems.
A.	True
B.	False
Answer» C.

Discussion

1218.	An OR gate with inverted inputs functions as:
A.	an AND gate.
B.	a NAND gate.
C.	a NOR gate.
D.	an inverter.
Answer» C. a NOR gate.

Discussion

1219.	How many BCD adders would be required to add the numbers 97310 + 3910?
A.	3
B.	4
C.	5
D.	6
Answer» B. 4

Discussion

1220.	The diagram given below shows a ________, and in order for the decimal number 3 to be displayed, terminals ________ must be ________.
A.	common-cathode seven-segment display, ef, LOW
B.	common-anode seven-segment display, abcdg, HIGH
C.	common-anode seven-segment display, abcdg, LOW
D.	common-cathode seven-segment display, abcdg, HIGH
Answer» D. common-cathode seven-segment display, abcdg, HIGH

Discussion

1221.	A(n) ________ is a combinational logic circuit that compares two input binary quantities and generates outputs to indicate which one has the greater magnitude.
A.	demultiplexer
B.	code converter
C.	magnitude comparator
D.	E-MOS
Answer» D. E-MOS

Discussion

1222.	If by chance more than one of the inputs in an HDL encoder is activated at the same time, the priority encoder ________.
A.	enters a fault mode
B.	ignores the least significant input
C.	resamples the data
D.	finds some other input
Answer» C. resamples the data

Discussion

1223.	A device that selects one of several inputs to be placed on the output is a multiplexer.
A.	True
B.	False
Answer» B. False

Discussion

1224.	The circuit shown below is a(n) ________.
A.	4-bit magnitude comparator
B.	4-bit half adder
C.	8-bit comparator
D.	8-bit binary adder
Answer» B. 4-bit half adder

Discussion

1225.	The device that generates a coded output from a single active numeric input line is ________.
A.	a decoder
B.	a multiplexer
C.	a comparator
D.	an encoder
Answer» E.

Discussion

1226.	A logic circuit that determines if one input is equal to another is called a comparator.
A.	True
B.	False
Answer» B. False

Discussion

1227.	A VARIABLE can be thought of as a piece of scrap paper used to write down some numbers that can be used later.
A.	True
B.	False
Answer» B. False

Discussion

1228.	Output 3 of a 74138 octal decoder is selected when it is enabled by a data input of: A0 = 1 A1 = 1 A2 = 0
A.	True
B.	False
Answer» B. False

Discussion

1229.	When data input I1 of a 74148 octal-to-binary encoder is active, the data output is: A0 = 0 A1 = 0 A2 = 1
A.	True
B.	False
Answer» C.

Discussion

1230.	Subtract the following binary numbers. 0101 1000 &nbsp 1010 0011 &nbsp 1101 1110 0010 0011 &nbsp 0011 1000 &nbsp 0101 0111
A.	0011 0100 0110 1010 1000 0110
B.	0011 0101 0110 1011 1000 0111
C.	0011 0101 0110 1010 1000 0111
D.	0011 0101 0110 1010 1000 0110
Answer» C. 0011 0101 0110 1010 1000 0111

Discussion

1231.	Inside a computer all arithmetic operations take place in the ________.
A.	accumulator register
B.	ALU
C.	CPU
D.	B register
Answer» C. CPU

Discussion

1232.	A ________ is user-programmable memory that cannot be erased and reprogrammed.
A.	ROM
B.	EPROM
C.	EEPROM
D.	PROM
Answer» E.

Discussion

1233.	PROMs are programmed by ________ fuses.
A.	zapping
B.	blowing
C.	charging
D.	inputting
Answer» B. blowing

Discussion

1234.	Read-only memory is memory ________.
A.	that has unlimited storage capacity
B.	whose data can never be altered by the user
C.	that must be refreshed periodically or it will lose storage
D.	that maintains storage as long as power is applied
Answer» C. that must be refreshed periodically or it will lose storage

Discussion

1235.	A device that needs constant refreshing to avoid losing data is a(n) ________.
A.	SRAM
B.	DRAM
C.	ROM
D.	EPROM
Answer» C. ROM

Discussion

1236.	The major advantage of CMOS logic circuits over TTL is very low power consumption.
A.	True
B.	False
Answer» B. False

Discussion

1237.	A FIFO ________.
A.	allows data to be clocked in and out at different clock rates
B.	outputs the data in the same order that it was input
C.	can be used to smooth out bursts of data into a continuous stream
D.	All of the above
Answer» E.

Discussion

1238.	When a computer is executing a program of instructions, the CPU will ________ memory locations as dictated by the program instructions.
A.	format
B.	scan
C.	store data into
D.	verify
Answer» D. verify

Discussion

1239.	A DRAM has a RAS and a CAS because ________.
A.	the address lines are multiplexed to reduce pin count
B.	the RAS determines the operation mode and the CAS enables the tristate outputs
C.	the RAS latches in the address and the CAS latches in data
D.	None of the above
Answer» B. the RAS determines the operation mode and the CAS enables the tristate outputs

Discussion

1240.	Dynamic memory is memory ________.
A.	that will maintain storage even if power is removed
B.	whose data can never be altered
C.	that must be refreshed periodically or it will lose storage
D.	that maintains storage as long as power is applied
Answer» D. that maintains storage as long as power is applied

Discussion

1241.	Dynamic RAMs store information by using ________.
A.	magnetism
B.	flip-flops
C.	latches
D.	capacitors
Answer» E.

Discussion

1242.	When more than one IC is used to provide all the addressable locations in a memory, a technique called ________ is used to identify which IC is being accessed.
A.	address decoding
B.	memory refresh
C.	data encoding
D.	memory paging
Answer» B. memory refresh

Discussion

1243.	The memory operation that presents data on the memory outputs after entering a new address is called ________.
A.	a read cycle
B.	a write cycle
C.	a refresh cycle
D.	a chip select
Answer» B. a write cycle

Discussion

1244.	Because of their nonvolatility, high speed, low power requirements, and lack of moving parts, ________ have become feasible alternatives to magnetic disk storage.
A.	CD-ROMs
B.	flash memory modules
C.	ROMs
D.	EPROMs
Answer» C. ROMs

Discussion

1245.	The EPROM is strictly a MOS device.
A.	True
B.	False
Answer» B. False

Discussion

1246.	A term often used commercially to refer to read/write memory is sequential-access memory.
A.	True
B.	False
Answer» C.

Discussion

1247.	DRAM chips can be combined for larger capacity and word sizes using the same methods as for other memory types.
A.	True
B.	False
Answer» B. False

Discussion

1248.	More than one bit of data can occupy each memory cell.
A.	True
B.	False
Answer» C.

Discussion

1249.	Flash memories are frequently used in place of floppy or small-capacity hard disk drives in portable computers.
A.	True
B.	False
Answer» B. False

Discussion

1250.	Information that is stored in a mask ROM ________.
A.	can be modified by using special equipment
B.	is stored by the manufacturer and cannot be changed
C.	is lost if power is interrupted
D.	can be modified by using special equipment and is lost if power is interrupted
Answer» C. is lost if power is interrupted

Discussion

Explore topic-wise MCQs in Engineering.

An octal-to-binary encoder has eight data inputs and encodes an output of ________ bits.

In an AHDL BCD to binary coded converter, multiplication by 10 is performed by ________.

In most modern computers, the transfer of data takes place over a common set of connecting lines called a ________.

A typical AHDL comparator follows an algorithm described as ________.

Another name for a multiplexer is ________.

When data input I6 of a 74148 octal-to-binary encoder is active, the data output is ________.

Output 6 of a 74138 octal decoder is selected when it is enabled by a data input of: A0 = 1 A1 = 1 A2 = 0

A circuit that converts some binary code into a singular active output representing its numerical value is a comparator.

The maximum output voltage recognized as a LOW by a TTL gate is 2.0 V.

Which of the figures in figure (a to d) is equivalent to figure (e)?

What does the term "random access" mean in terms of memory?

A four-line multiplexer must have as inputs four data inputs and two select inputs.

In HDL, a process is usually thought of as a wire connecting two points in a circuit.

A demultiplexer is a device that converts some code to a recognizable number or character.

The original Pentium was the first CPU to feature separate data and instruction caches.

A NOR gate and an OR gate operate in exactly the same way.

Synchronous binary counters can only be used for the application of timing of digital systems.

An OR gate with inverted inputs functions as:

How many BCD adders would be required to add the numbers 97310 + 3910?

The diagram given below shows a ________, and in order for the decimal number 3 to be displayed, terminals ________ must be ________.

A(n) ________ is a combinational logic circuit that compares two input binary quantities and generates outputs to indicate which one has the greater magnitude.

If by chance more than one of the inputs in an HDL encoder is activated at the same time, the priority encoder ________.

A device that selects one of several inputs to be placed on the output is a multiplexer.

The circuit shown below is a(n) ________.

The device that generates a coded output from a single active numeric input line is ________.

A logic circuit that determines if one input is equal to another is called a comparator.

A VARIABLE can be thought of as a piece of scrap paper used to write down some numbers that can be used later.

Output 3 of a 74138 octal decoder is selected when it is enabled by a data input of: A0 = 1 A1 = 1 A2 = 0

When data input I1 of a 74148 octal-to-binary encoder is active, the data output is: A0 = 0 A1 = 0 A2 = 1

Subtract the following binary numbers. 0101 1000 &amp;nbsp 1010 0011 &amp;nbsp 1101 1110 0010 0011 &amp;nbsp 0011 1000 &amp;nbsp 0101 0111

Inside a computer all arithmetic operations take place in the ________.

A ________ is user-programmable memory that cannot be erased and reprogrammed.

PROMs are programmed by ________ fuses.

Read-only memory is memory ________.

A device that needs constant refreshing to avoid losing data is a(n) ________.

The major advantage of CMOS logic circuits over TTL is very low power consumption.

A FIFO ________.

When a computer is executing a program of instructions, the CPU will ________ memory locations as dictated by the program instructions.

A DRAM has a RAS and a CAS because ________.

Dynamic memory is memory ________.

Dynamic RAMs store information by using ________.

When more than one IC is used to provide all the addressable locations in a memory, a technique called ________ is used to identify which IC is being accessed.

The memory operation that presents data on the memory outputs after entering a new address is called ________.

Because of their nonvolatility, high speed, low power requirements, and lack of moving parts, ________ have become feasible alternatives to magnetic disk storage.

The EPROM is strictly a MOS device.

A term often used commercially to refer to read/write memory is sequential-access memory.

DRAM chips can be combined for larger capacity and word sizes using the same methods as for other memory types.

More than one bit of data can occupy each memory cell.

Flash memories are frequently used in place of floppy or small-capacity hard disk drives in portable computers.

Information that is stored in a mask ROM ________.

The diagram given below shows a , and in order for the decimal number 3 to be displayed, terminals must be .

Subtract the following binary numbers. 0101 1000 &nbsp 1010 0011 &nbsp 1101 1110 0010 0011 &nbsp 0011 1000 &nbsp 0101 0111