2291 + Mcqs in Digital Electronics Page 16 McqOptions

751.	The bit sequence 0010 is serially entered (right-most bit first) into a 4-bit parallel out shift register that is initially clear. What are the Q outputs after two clock pulses?
A.	0000
B.	0010
C.	1000
D.	1111
Answer» D. 1111

Discussion

752.	What is a shift register that will accept a parallel input, or a bidirectional serial load and internal shift features, called?
A.	tristate
B.	end around
C.	universal
D.	conversion
Answer» D. conversion

Discussion

753.	A half-adder circuit would normally be used each time a carry input is required in an added circuit.
A.	True
B.	False
Answer» C.

Discussion

754.	If B[7..0] = 10100101, what is the value of B[6..2]?
A.	10100
B.	01001
C.	10010
D.	00101
Answer» C. 10010

Discussion

755.	What is the most important operation in binary-coded decimal (BCD) arithmetic?
A.	addition
B.	subtraction
C.	multiplication
D.	division
Answer» B. subtraction

Discussion

756.	The range of positive numbers when using an eight-bit two's-complement system is:
A.	0 to 64
B.	0 to 100
C.	0 to 127
D.	0 to 256
Answer» D. 0 to 256

Discussion

757.	What are the two types of basic adder circuits?
A.	sum and carry
B.	half-adder and full-adder
C.	asynchronous and synchronous
D.	one- and two's-complement
Answer» C. asynchronous and synchronous

Discussion

758.	Using 4-bit adders to create a 1See Section 6-bit adder:
A.	requires 16 adders.
B.	requires 4 adders.
C.	requires the carry-out of the less significant adder to be connected to the carry-in of the next significant adder.
D.	requires 4 adders and the connection of the carry out of the less significant adder to the carry-in of the next significant adder.
Answer» E.

Discussion

759.	When performing subtraction by addition in the 2's-complement system:
A.	the minuend and the subtrahend are both changed to the 2's-complement.
B.	the minuend is changed to 2's-complement and the subtrahend is left in its original form.
C.	the minuend is left in its original form and the subtrahend is changed to its 2's-complement.
D.	the minuend and subtrahend are both left in their original form.
Answer» D. the minuend and subtrahend are both left in their original form.

Discussion

760.	The two's-complement system is to be used to add the signed numbers 11110010 and 11110011. Determine, in decimal, the sign and value of each number and their sum.
A.	14 and 13, 27
B.	113 and 114, 227
C.	27 and 13, 40
D.	11 and 16, 27
Answer» B. 113 and 114, 227

Discussion

761.	When 1100010 is divided by 0101, what is the decimal remainder?
A.	2
B.	3
C.	4
D.	6
Answer» C. 4

Discussion

762.
A.	10011110
B.	01211110
C.	000100000100
D.	001000001000
Answer» D. 001000001000

Discussion

763.	The most commonly used system for representing signed binary numbers is the:
A.	2's-complement system.
B.	1's-complement system.
C.	10's-complement system.
D.	sign-magnitude system.
Answer» B. 1's-complement system.

Discussion

764.	What is the major difference between half-adders and full-adders?
A.	Nothing basically; full-adders are made up of two half-adders.
B.	Full adders can handle double-digit numbers.
C.	Full adders have a carry input capability.
D.	Half adders can handle only single-digit numbers.
Answer» D. Half adders can handle only single-digit numbers.

Discussion

765.	If a 10-bit ring counter has an initial state 1101000000, what is the state after the second clock pulse?
A.	1101000000
B.	0011010000
C.	1100000000
D.	0000000000
Answer» C. 1100000000

Discussion

766.	How much storage capacity does each stage in a shift register represent?
A.	One bit
B.	Two bits
C.	Four bits (one nibble)
D.	Eight bits (one byte)
Answer» B. Two bits

Discussion

767.	Convert each of the decimal numbers to 8-bit two's-complement form and then perform subtraction by taking the two's-complement and adding.
A.	0001 0011
B.	0000 1110
C.	0010 1110
D.	1110 0000
Answer» C. 0010 1110

Discussion

768.	Adding in binary, a decimal 26 + 27 will produce a sum of:
A.	111010
B.	110110
C.	110101
D.	101011
Answer» D. 101011

Discussion

769.	Convert each of the following signed binary numbers (two's-complement) to a signed decimal number.00000101 11111100 11111000
A.	5 +4 +8
B.	+5 4 8
C.	5 +252 +248
D.	+5 252 248
Answer» C. 5 +252 +248

Discussion

770.	How many basic binary subtraction operations are possible?
A.	4
B.	3
C.	2
D.	1
Answer» B. 3

Discussion

771.	Fast-look-ahead carry circuits found in most 4-bit full-adder circuits:
A.	determine sign and magnitude
B.	reduce propagation delay
C.	add a 1 to complemented inputs
D.	increase ripple delay
Answer» C. add a 1 to complemented inputs

Discussion

772.	Add the following hexadecimal numbers. 3C &nbsp 14 &nbsp 3B +25 &nbsp +28 &nbsp +DC
A.	60 3C 116
B.	62 3C 118
C.	61 3C 117
D.	61 3D 117
Answer» D. 61 3D 117

Discussion

773.	What are constants in VHDL code?
A.	Fixed numbers represented by a name
B.	Fixed variables used in functions
C.	Fixed number types
D.	Constants do not exist in VHDL code.
Answer» B. Fixed variables used in functions

Discussion

774.	When the output of a tristate shift register is disabled, the output level is placed in a:
A.	float state
B.	LOW state
C.	high-impedance state
D.	float or high-impedance state
Answer» E.

Discussion

775.	Another way to connect devices to a shared data bus is to use a ________.
A.	circulating gate
B.	transceiver
C.	bidirectional encoder
D.	strobed latch
Answer» C. bidirectional encoder

Discussion

776.	To serially shift a nibble (four bits) of data into a shift register, there must be ________.
A.	one clock pulse
B.	four clock pulses
C.	eight clock pulses
D.	one clock pulse for each 1 in the data
Answer» C. eight clock pulses

Discussion

777.	Computers operate on data internally in a ________ format.
A.	tristate
B.	universal
C.	parallel
D.	serial
Answer» D. serial

Discussion

778.	In a 4-bit Johnson counter sequence there are a total of how many states, or bit patterns?
A.	1
B.	2
C.	4
D.	8
Answer» E.

Discussion

779.	What are the three output conditions of a three-state buffer?
A.	HIGH, LOW, float
B.	1, 0, float
C.	both of the above
D.	neither of the above
Answer» D. neither of the above

Discussion

780.	The primary purpose of a three-state buffer is usually:
A.	to provide isolation between the input device and the data bus
B.	to provide the sink or source current required by any device connected to its output without loading down the output device
C.	temporary data storage
D.	to control data flow
Answer» B. to provide the sink or source current required by any device connected to its output without loading down the output device

Discussion

781.	What is a recirculating register?
A.	serial out connected to serial in
B.	all
C.	<i>Q</i>
D.	outputs connected together
E.	a register that can be used over again
Answer» B. all

Discussion

782.	When is it important to use a three-state buffer?
A.	when two or more outputs are connected to the same input
B.	when all outputs are normally HIGH
C.	when all outputs are normally LOW
D.	when two or more outputs are connected to two or more inputs
Answer» B. when all outputs are normally HIGH

Discussion

783.	How would a latch circuit be used in a microprocessor system?
A.	as transportation for Intel employees
B.	for a group of data that is the same
C.	as a set of common connections for transfer of data
Answer» D.

Discussion

784.	What is the principal advantage of using address multiplexing with DRAM memory?
A.	reduced memory access time
B.	reduced requirement for constant refreshing of the memory contents
C.	reduced pin count and decrease in package size
D.	It eliminates the requirement for a chip-select input line, thereby reducing the pin count.
Answer» D. It eliminates the requirement for a chip-select input line, thereby reducing the pin count.

Discussion

785.	On a CD-ROM, ________ are raised areas representing a 1.
A.	mounds
B.	lands
C.	holes
D.	pits
Answer» C. holes

Discussion

786.	The location of a unit of data in a memory array is called its ________.
A.	storage
B.	RAM
C.	address
D.	data
Answer» D. data

Discussion

787.	How many address bits are required for a 4096-bit memory organized as a 512 8 memory?
A.	2
B.	4
C.	8
D.	9
Answer» E.

Discussion

788.	In general, the ________ have the smallest bit size and the ________ have the largest.
A.	EEPROMs, Flash
B.	SRAM, mask ROM
C.	mask ROM, SRAM
D.	DRAM, PROM
Answer» B. SRAM, mask ROM

Discussion

789.	Advantage(s) of an EEPROM over an EPROM is/are:
A.	the EPROM can be erased with ultraviolet light in much less time than an EEPROM
B.	the EEPROM can be erased and reprogrammed without removal from the circuit
C.	the EEPROM has the ability to erase and reprogram individual words
D.	the EEPROM can be erased and reprogrammed without removal from the circuit, and can erase and reprogram individual words
Answer» E.

Discussion

790.	The main advantage of semiconductor RAM is its ability to:
A.	retain stored data when power is interrupted or turned off
B.	be written to and read from rapidly
C.	be randomly accessed
D.	be sequentially accessed
Answer» C. be randomly accessed

Discussion

791.	For the given circuit, what is the bit length of the output data word?
A.	3
B.	4
C.	8
D.	32
Answer» C. 8

Discussion

792.	How many clock pulses will be required to completely load serially a 5-bit shift register?
A.	2
B.	3
C.	4
D.	5
Answer» E.

Discussion

793.	A 4-bit shift register that receives 4 bits of parallel data will shift to the ________ by ________ position(s) for each clock pulse.
A.	right, one
B.	right, two
C.	left, one
D.	left, three
Answer» B. right, two

Discussion

794.	Which of the following describes the action of storing a bit of data in a mask ROM?
A.	A 1 is stored in a bipolar cell by opening the base connection to the address line.
B.	A 0 is stored in a bipolar cell by shorting the base connection to the address line.
C.	A 1 is stored by connecting the gate of a MOS cell to the address line.
D.	A 0 is stored by connecting the gate of a MOS cell to the address line.
Answer» D. A 0 is stored by connecting the gate of a MOS cell to the address line.

Discussion

795.	Which type of ROM can be erased by UV light?
A.	ROM
B.	mask ROM
C.	EPROM
D.	EEPROM
Answer» D. EEPROM

Discussion

796.	Which of the following is NOT a type of memory?
A.	RAM
B.	ROM
C.	FPROM
D.	EEPROM
Answer» D. EEPROM

Discussion

797.	EEPROM stands for ________.
A.	encapsulated electrical programmable read-only memory
B.	elementary electrical programmable read-only memory
C.	electrically erasable programmable read-only memory
D.	elementary erasable programmable read-only memory
Answer» D. elementary erasable programmable read-only memory

Discussion

798.	Which is not a hard disk performance parameter?
A.	Seek time
B.	Break time
C.	Latency period
D.	Access time
Answer» C. Latency period

Discussion

799.	L1 is known as ________.
A.	primary cache
B.	secondary cache
C.	DRAM
D.	SRAM
Answer» B. secondary cache

Discussion

800.	Describe the timing diagram of a write operation.
A.	First the data is set on the data bus and the address is set, then the write pulse stores the data.
B.	First the address is set, then the data is set on the data bus, and finally the read pulse stores the data.
C.	First the write pulse stores the data, then the address is set, and finally the data is set on the data bus.
D.	First the data is set on the data bus, then the write pulse stores the data, and finally the address is set.
Answer» B. First the address is set, then the data is set on the data bus, and finally the read pulse stores the data.

Discussion

Explore topic-wise MCQs in Engineering.

The bit sequence 0010 is serially entered (right-most bit first) into a 4-bit parallel out shift register that is initially clear. What are the Q outputs after two clock pulses?

What is a shift register that will accept a parallel input, or a bidirectional serial load and internal shift features, called?

A half-adder circuit would normally be used each time a carry input is required in an added circuit.

If B[7..0] = 10100101, what is the value of B[6..2]?

What is the most important operation in binary-coded decimal (BCD) arithmetic?

The range of positive numbers when using an eight-bit two's-complement system is:

What are the two types of basic adder circuits?

Using 4-bit adders to create a 1See Section 6-bit adder:

When performing subtraction by addition in the 2's-complement system:

The two's-complement system is to be used to add the signed numbers 11110010 and 11110011. Determine, in decimal, the sign and value of each number and their sum.

When 1100010 is divided by 0101, what is the decimal remainder?

The most commonly used system for representing signed binary numbers is the:

What is the major difference between half-adders and full-adders?

If a 10-bit ring counter has an initial state 1101000000, what is the state after the second clock pulse?

How much storage capacity does each stage in a shift register represent?

Convert each of the decimal numbers to 8-bit two's-complement form and then perform subtraction by taking the two's-complement and adding.

Adding in binary, a decimal 26 + 27 will produce a sum of:

Convert each of the following signed binary numbers (two's-complement) to a signed decimal number.00000101 11111100 11111000

How many basic binary subtraction operations are possible?

Fast-look-ahead carry circuits found in most 4-bit full-adder circuits:

Add the following hexadecimal numbers. 3C &amp;nbsp 14 &amp;nbsp 3B +25 &amp;nbsp +28 &amp;nbsp +DC

What are constants in VHDL code?

When the output of a tristate shift register is disabled, the output level is placed in a:

Another way to connect devices to a shared data bus is to use a ________.

To serially shift a nibble (four bits) of data into a shift register, there must be ________.

Computers operate on data internally in a ________ format.

In a 4-bit Johnson counter sequence there are a total of how many states, or bit patterns?

What are the three output conditions of a three-state buffer?

The primary purpose of a three-state buffer is usually:

What is a recirculating register?

When is it important to use a three-state buffer?

How would a latch circuit be used in a microprocessor system?

What is the principal advantage of using address multiplexing with DRAM memory?

On a CD-ROM, ________ are raised areas representing a 1.

The location of a unit of data in a memory array is called its ________.

How many address bits are required for a 4096-bit memory organized as a 512 8 memory?

In general, the ________ have the smallest bit size and the ________ have the largest.

Advantage(s) of an EEPROM over an EPROM is/are:

The main advantage of semiconductor RAM is its ability to:

For the given circuit, what is the bit length of the output data word?

How many clock pulses will be required to completely load serially a 5-bit shift register?

A 4-bit shift register that receives 4 bits of parallel data will shift to the ________ by ________ position(s) for each clock pulse.

Which of the following describes the action of storing a bit of data in a mask ROM?

Which type of ROM can be erased by UV light?

Which of the following is NOT a type of memory?

EEPROM stands for ________.

Which is not a hard disk performance parameter?

L1 is known as ________.

Describe the timing diagram of a write operation.

Add the following hexadecimal numbers. 3C &nbsp 14 &nbsp 3B +25 &nbsp +28 &nbsp +DC

In general, the have the smallest bit size and the have the largest.

A 4-bit shift register that receives 4 bits of parallel data will shift to the by position(s) for each clock pulse.