2291 + Mcqs in Digital Electronics Page 38 McqOptions

1851.	________ symbols are needed to represent all digits in hexadecimal.
A.	Six
B.	Ten
C.	Twelve
D.	Sixteen
Answer» E.

Discussion

1852.	Each hexadecimal digit converts to ________ binary digits.
A.	four
B.	eight
C.	12
D.	six
Answer» B. eight

Discussion

1853.	Decimal 2875 is ________ bytes in binary.
A.	2
B.	3
C.	4
D.	5
Answer» B. 3

Discussion

1854.	Binary-coded-decimal 0111 1001 0011 is ________ in binary.
A.	011110010011
B.	010110101111
C.	001100110011
D.	001100011001
Answer» E.

Discussion

1855.	Decimal 42 is equivalent to binary ________.
A.	01000010
B.	52
C.	2A
D.	101010
Answer» E.

Discussion

1856.	The decimal number 128 is represented in the signed 2's complement system as ________.
A.	1111 1110
B.	0111 1111
C.	1000 0000
D.	1111 1111
Answer» D. 1111 1111

Discussion

1857.	A typical CD-ROM can store ________ of digital data.
A.	90 minutes
B.	analog portions
C.	650 megabytes
D.	octal bytes
Answer» D. octal bytes

Discussion

1858.	Hexadecimal 44 is ________ in binary.
A.	01000100
B.	10011010
C.	01011000
D.	10001100
Answer» B. 10011010

Discussion

1859.	Resistors usually 300 apiece inserted between a decoder and a 7-segment display are ________.
A.	pull-up resistors to keep logic HIGH when the input is open
B.	sense resistors to enable a test of logic levels
C.	current limiting resistors for the 7-segment display
D.	surge resistors to prevent damage from power-line variations
Answer» D. surge resistors to prevent damage from power-line variations

Discussion

1860.	Decimal 37 is ________ in binary with an even parity bit.
A.	00100101
B.	10100101
C.	11000100
D.	01001011
Answer» C. 11000100

Discussion

1861.	Adding a zero to the leftmost bit of an ASCII code is called ________.
A.	extra zero
B.	zero padding
Answer» C.

Discussion

1862.	The largest BCD number that can be represented with four binary bits is ________.
A.	9
B.	10
C.	15
D.	16
Answer» B. 10

Discussion

1863.	The two digits in the binary number system are ___ and ___.
A.	1, 2
B.	H, L
C.	T, F
D.	0, 1
Answer» E.

Discussion

1864.	The decimal fraction 1/4 can be written in binary as________.
A.	0.010
B.	0.100
C.	0.110
D.	0.011
Answer» B. 0.100

Discussion

1865.	An unweighted code in which only one bit changes from one code number to the next is ________.
A.	BCD
B.	Excess-3
C.	Gray
D.	ASCII
Answer» D. ASCII

Discussion

1866.	Decimal 474 is ________ in BCD.
A.	0100 0111 0100
B.	0100 1011 0101
C.	0100 1001 0011
D.	0110 1011 1001
Answer» B. 0100 1011 0101

Discussion

1867.	Hexadecimal F2 is ________ in binary.
A.	11100011
B.	10100001
C.	11110010
D.	11111100
Answer» D. 11111100

Discussion

1868.	An ADC is an analog-to-digital converter.
A.	True
B.	False
Answer» B. False

Discussion

1869.	Memory devices store binary data.
A.	True
B.	False
Answer» B. False

Discussion

1870.	A graph of phase vs. time is a timing diagram.
A.	True
B.	False
Answer» C.

Discussion

1871.	The arithmetic/logic unit will send the results of its decisions to memory.
A.	True
B.	False
Answer» C.

Discussion

1872.	Digital systems require that voltage levels change between high and low.
A.	True
B.	False
Answer» B. False

Discussion

1873.	It is possible to have an overlap between high and low levels in digital logic.
A.	True
B.	False
Answer» C.

Discussion

1874.	X-ray, MRI, and ultrasound systems in hospitals are examples of analog systems.
A.	True
B.	False
Answer» B. False

Discussion

1875.	With an OR gate, the output is HIGH only when both inputs are HIGH.
A.	True
B.	False
Answer» C.

Discussion

1876.	A microcomputer is not a general-purpose computer.
A.	True
B.	False
Answer» C.

Discussion

1877.	An invalid digital signal is used as a zero.
A.	True
B.	False
Answer» C.

Discussion

1878.	In a positive logic system, the logic LOW could be between 0 V and 0.8 V.
A.	True
B.	False
Answer» B. False

Discussion

1879.	An inverter performs a NOT operation.
A.	True
B.	False
Answer» B. False

Discussion

1880.	Greater accuracy and precision are possible with digital techniques.
A.	True
B.	False
Answer» B. False

Discussion

1881.	The real world is mainly analog.
A.	True
B.	False
Answer» B. False

Discussion

1882.	Using digital techniques of information storage is easy.
A.	True
B.	False
Answer» B. False

Discussion

1883.	One advantage of analog circuits over digital circuits is that it's easier to store data.
A.	True
B.	False
Answer» C.

Discussion

1884.	Digital circuits cannot perform logic comparisons since the circuit can have only one of two values at any instant.
A.	True
B.	False
Answer» C.

Discussion

1885.	Telecommunications systems do not use digital techniques.
A.	True
B.	False
Answer» C.

Discussion

1886.	Binary means having two states or values.
A.	True
B.	False
Answer» B. False

Discussion

1887.	Four bits equal one byte.
A.	True
B.	False
Answer» C.

Discussion

1888.	The time interval on the leading edge of a pulse between 10% and 90% of the amplitude is the rise time.
A.	True
B.	False
Answer» B. False

Discussion

1889.	In a negative logic system, the area represented by #3 in the given figure would be the ________ level.
A.	HIGH
B.	LOW
C.	off
D.	uncertain
Answer» B. LOW

Discussion

1890.	The area represented by #4 in the given figure is the ________ level.
A.	HIGH
B.	LOW
C.	off
D.	unacceptable
Answer» E.

Discussion

1891.	A continually variable, proportional indicator is a(n) ________ representation.
A.	decimal
B.	digital
C.	unconstitutional
D.	analog
Answer» E.

Discussion

1892.	The control and arithmetic/logic units are often considered as one unit called the ________.
A.	central processing unit
B.	inputs and outputs
C.	microcomputer
D.	arithmetic/logic unit
Answer» B. inputs and outputs

Discussion

1893.	A microcontroller would not be used in a(n) ________.
A.	VCR
B.	automobile ignition system
C.	antilock brakes
D.	grandfather clock
Answer» E.

Discussion

1894.	________ is the highest-value seven-bit binary number.
A.	128
B.	127
C.	126
D.	125
Answer» C. 126

Discussion

1895.	The systems shown in the given figure communicate using ________.
A.	parallel data
B.	serial data
C.	serial-parallel data
D.	both parallel and serial data
Answer» B. serial data

Discussion

1896.	A binary number can be converted to be viewed on a 7-segment display by a(n) ________.
A.	decoder
B.	encoder
C.	multiplexer
D.	magnitude comparator
Answer» B. encoder

Discussion

1897.	The CPU contains all the circuitry for ________.
A.	storing data
B.	keeping track of time
C.	fetching and interpreting instructions
D.	Internet operations
Answer» D. Internet operations

Discussion

1898.	Demultiplexing is a logic function that ________.
A.	determines which of several inputs is the greatest
B.	switches logic from one input to any of several output lines
C.	switches logic from several inputs onto one output line
D.	converts a code from one form to another
Answer» C. switches logic from several inputs onto one output line

Discussion

1899.	In ________ the quantities are not represented by continuously variable indicators.
A.	analog representation
B.	digital representation
C.	signal representation
D.	computer representation
Answer» C. signal representation

Discussion

1900.	The combination of waveforms consisting of the given figures 1 and 2 is generally referred to as ________.
A.	simultaneous waveforms
B.	a timing diagram
C.	two-phase waveforms
D.	pulse waveforms
Answer» C. two-phase waveforms

Discussion

Explore topic-wise MCQs in Engineering.

________ symbols are needed to represent all digits in hexadecimal.

Each hexadecimal digit converts to ________ binary digits.

Decimal 2875 is ________ bytes in binary.

Binary-coded-decimal 0111 1001 0011 is ________ in binary.

Decimal 42 is equivalent to binary ________.

The decimal number 128 is represented in the signed 2's complement system as ________.

A typical CD-ROM can store ________ of digital data.

Hexadecimal 44 is ________ in binary.

Resistors usually 300 apiece inserted between a decoder and a 7-segment display are ________.

Decimal 37 is ________ in binary with an even parity bit.

Adding a zero to the leftmost bit of an ASCII code is called ________.

The largest BCD number that can be represented with four binary bits is ________.

The two digits in the binary number system are ___ and ___.

The decimal fraction 1/4 can be written in binary as________.

An unweighted code in which only one bit changes from one code number to the next is ________.

Decimal 474 is ________ in BCD.

Hexadecimal F2 is ________ in binary.

An ADC is an analog-to-digital converter.

Memory devices store binary data.

A graph of phase vs. time is a timing diagram.

The arithmetic/logic unit will send the results of its decisions to memory.

Digital systems require that voltage levels change between high and low.

It is possible to have an overlap between high and low levels in digital logic.

X-ray, MRI, and ultrasound systems in hospitals are examples of analog systems.

With an OR gate, the output is HIGH only when both inputs are HIGH.

A microcomputer is not a general-purpose computer.

An invalid digital signal is used as a zero.

In a positive logic system, the logic LOW could be between 0 V and 0.8 V.

An inverter performs a NOT operation.

Greater accuracy and precision are possible with digital techniques.

The real world is mainly analog.

Using digital techniques of information storage is easy.

One advantage of analog circuits over digital circuits is that it's easier to store data.

Digital circuits cannot perform logic comparisons since the circuit can have only one of two values at any instant.

Telecommunications systems do not use digital techniques.

Binary means having two states or values.

Four bits equal one byte.

The time interval on the leading edge of a pulse between 10% and 90% of the amplitude is the rise time.

In a negative logic system, the area represented by #3 in the given figure would be the ________ level.

The area represented by #4 in the given figure is the ________ level.

A continually variable, proportional indicator is a(n) ________ representation.

The control and arithmetic/logic units are often considered as one unit called the ________.

A microcontroller would not be used in a(n) ________.

________ is the highest-value seven-bit binary number.

The systems shown in the given figure communicate using ________.

A binary number can be converted to be viewed on a 7-segment display by a(n) ________.

The CPU contains all the circuitry for ________.

Demultiplexing is a logic function that ________.

In ________ the quantities are not represented by continuously variable indicators.

The combination of waveforms consisting of the given figures 1 and 2 is generally referred to as ________.

The two digits in the binary number system are _ and _.