## Practice MCQ Digital Electronics

Page 1 of 50, Total 225 results. | Shuffle Order | Flagged | Next Page
Conversion of decimal number 7110 to it's binary number equivalent is
Options:1100112,    11100112,    01100112,    10001112

Which of the following flip-flops is free from race around problem?
Options:T flip-flop,    SR flip-flop,    master slave JK flip-flop,    All of the above

Conversion of decimal number 6710 to it's octal number equivalent is
Options:1008,    1038,    1098,    998

A NOR gate has two or more input signals. All input must be _____ to get a high output
Options:low,    high,    some low some high,    1's

The inverter OR gate and AND gate are called decision-making elements because they can recognize some input _____ while disregarding others. A gate recognizes a word when its output is _____
Options:words, high,    bytes, low,    bytes, high,    character, low

A positive AND gate is also a negative
Options:NAND gate,    NOR gate,    AND gate,    OR gate

In which code the successive code characters differ in only one bit position?
Options:gray code,    excess 3 code,    8421 code,    algebraic code

Conversion of binary number 1011012 to hexadecimal is
Options:3716,    2D16,    2E16,    2716

ASCII and EBCDIC differ in
Options:their efficiency in storing data,    the random and sequential access method,    the number of bytes used to store characters,    their collecting sequences

A p- channel enhancement type MOSFET performs much the same function as a PNP transistor, except that
Options:it operates much faster,    it is considerably larger,    it is controlled by voltage rather than by current, so that it requires very little current at the control terminal,    it is controlled by current rather than by voltage like a bipolar transistor.

De Morgan's second therm says that NAND gate is equivalent to a bubbled _____ gate.
Options:AND,    XAND,    XOR,    OR

What logic function is produced by adding an inverter to each input and the output of an AND gate?
Options:NAND,    NOR,    OR,    XOR

When a transistor is cut off or saturated, transistor _____ have almost no effect
Options:wave,    variations,    stage,    circuits

Express -7 as 16-bit signed binary numbers.
Options:0000 0000 0000 0111,    1000 0000 0000 0111,    . 0111 0000 0000 0001,    0111 0000 0000 0000

With an RS latch a high S and low R sets the output to _____ ; a low S and a high R _____ the output to low.
Options:No change, set,    Race, high,    high, reset,    set, reset

Flip-flop outputs are always
Options:complimentary,    the same,    independent of each other,    same as inputs

The output 0 and 1 levels for TTL logic family is approximately
Options:0.1 and 5 V,    0.6 and 3.5 V,    0.9 and 1.75V,    -1.75 and -0.9 V

A _____ TTL device can sink up to 16mA and can source up to 400 MA.
Options:Low-power,    high-power,    Standard,    Schottky

What is the 2's complement of 0011 0101 1001 1100 number?
Options:1100 1010 1100 1011,    1100 1010 0110 0011,    1100 1010 0110 0100,    1100 1010 1111 1111

Digital design often starts by constructing a _____ table.
Options:Standard,    Two-stage,    Truth,    Two-dinensional

The hexadecimal digits are 0 to 9 and A to _____
Options:E,    F,    G,    D

The ASCII
Options:is a subset of 8-bit EBCDIC,    is used only in Western Countries,    is version II of the ASC Standard,    has 128 characters, including 32 control characters

An OR gate has 6 inputs. What is the only input word that produces a 0 output?
Options:000000,    000111,    111000,    111111

A diagram that illustrates the ore (Logic) of functions in a progran called a
Options:Flowchart,    Sequence of steps,    Direction of flow,    All of the above

The Gray code for decimal 7 is
Options:0111,    1011,    0100,    0101

The time required for a pulse to decrease from 90 to 10 percent of its maximum value is known as
Options:rise time,    decay time,    binary level transition period,    propagation delay

Conversion of binary number 1010000101112 to hexadecimal number is
Options:D8F916,    A8B916,    A1716,    D9F816

_____dominates the LSI field, and _____ is used extensively where lowest power consumption is necessary.
Options:NMOS, PMOS,    PMOS, CMOS,    NMOS, CMOS,    MOSFET, PMOS

Conversion of an octal number 1438 to its decimal number is
Options:9010,    97110,    9910,    10710

How many inputs signals can a gate have?
Options:one,    more than one,    two only,    both (a) and (b)

A combinational logic circuit which is used when it is desired to send data from two or more source through a single transmission line is known as
Options:encoder,    decoder,    multiplexer,    demultiplexer

Conversion of binary number 10010012 to hexadecimal is
Options:4016,    3916,    4916,    4216

Which logic family dissipates the minimum power?
Options:DTL,    TTL,    ECL,    CMOS

What logic function is obtained by adding an inverter to the inputs of an AND gate?
Options:OR,    NAND,    XOR,    NOR

A bus is a group of _____ carrying digital signals.
Options:wires,    gates,    transistors,    registers

The simplified form of the Boolean expression (X + Y + XY)(X + Z) is
Options:X + Y + Z,    XY + YZ,    X + YZ,    XZ + Y

De Morgan's first theorem says that a NOR gate is equivalent to a bubbled _____ gate.
Options:AND,    XAND,    XOR,    NOR

Addition of 102 and 112 is
Options:1002,    1012,    1112,    1102

How many bits are required to encode all twenty six letters ten symbols, and ten numerals?
Options:5,    6,    2,    3

An inverter is also called a _____ gate.
Options:NOT,    OR,    AND,    NAND

Conversion of decimal number 1310 to it's octal number equivalent is
Options:158,    178,    138,    118

The binary number 1100 0101 has _____ bytes
Options:1,    2,    4,    8

With a NAND latch a low R and a low S produce a _____ condition.
Options:race,    set,    reset,    no change

Which of the following logic families has the highest noise immunity?
Options:RTL,    DTL,    TTL,    HTL

Conversion of decimal number 6110 to it's binary number equivalent is
Options:1100112,    110011102,    1111012,    111112

An OR gate can be imagined as
Options:switches connected in series,    switches connected in parallel,    MOS transistors connected in series,    All of the above

Address 200H contains the byte 3FH. What is the decimal equivalent of 3FH
Options:63,    32,    16,    38

Conversion of an octal number 1128 to hexadecimal number is
Options:4A16,    5A16,    1516,    2016