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Intro to Hardware Description Language

Is a programming language used to describe the behavior or structure of digital circuits for simulating the circuit and Verilog is by far the most popular.

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The expression of a NAND gate is_______

  • (A.B)’
  • A’B+AB’
  • (A+B)’
  • A.B

The subtraction using 1’s complement of 110 – 100 will give the result ___________

  • -010
  • -011
  • 010
  • 011

The value of radix in binary number system is _____________

  • 2
  • 8
  • 1
  • 10

In double precision format, the size of the mantissa is ______

  • 64
  • 52 bit
  • 72
  • 32 bit

In the boolean function w=f(X,Y,Z), what is the RHS referred to as ________

  • boolean
  • expression
  • right hand side
  • literals

In parts of the processor, adders are used to calculate ____________

  • Addresses
  • All of the Mentioned
  • Increment and decrement operators
  • Table indices

In a multiplexer the output depends on its ___________

  • Select outputs
  • Enable pin
  • Select inputs
  • Data inputs

The 10’s complement of 562 is __________

  • 3
  • 7
  • 4
  • 8

The device shown here is most likely a ________

  • Inverter
  • Multiplexer
  • Comparator
  • Demultiplexer

The following figure shows a ___________ gate.

  • NOR
  • OR
  • NAND
  • EXOR

Which of the following logical operations is represented by the + sign in Boolean algebra?

  • complementation
  • OR
  • AND
  • inversion

The max term when X=Y=Z=1 is ________

  • xyz
  • x’y’z’
  • x’+y’+z’
  • x+y+z

Which of the following is the correct representation of a binary number?

  • 1110
  • (000)2
  • (124)2
  • (110)2

The Output is LOW if any one of the inputs is HIGH in case of a _________ gate.

  • AND
  • NAND
  • NOR
  • OR

Which of the circuits in figure (a to d) is the sum-of-products implementation of figure (e)?

  • d
  • c
  • b
  • a

Convert (22)8 into its corresponding decimal number.

  • 18
  • 28
  • 82
  • 81

The binary number 111 in octal format is ________________

  • 8
  • 5
  • 7
  • 6

(1217)8 is equivalent to

  • (2297)10
  • (1217)16
  • (028F)16
  • (0B17)16

The 9’s complement of 6578 is ___________

  • 3124
  • 1234
  • 3420
  • 3421

CPU has built-in ability to execute a particular set of machine instructions, called as __________

  • Instruction Set
  • User instructions
  • Registers
  • Sequence Set

7’s complement of 432 is _________________

  • 345
  • 432
  • 543
  • 777

3 bits full adder contains ________

  • 3 combinational inputs
  • 8 combinational inputs
  • 6 combinational inputs
  • 4 combinational inputs

The complement of the input given is obtained in case of:

  • EX-OR
  • NOR
  • AND+NOR
  • NOT

What type of logic circuit is represented by the figure shown below?

  • AND
  • NAND
  • XNOR
  • XOR

The sequential circuit is also called ___________

  • Flip-flop
  • Latch
  • Adder
  • Strobe

Whose operations are more faster among the following?

  • Latches
  • Sequential circuits
  • Combinational circuits
  • Flip-flops

The complement term for X’.Y’.Z + X.Y will be _____________

  • (X+Y+Z’)(X’+Y)
  • (X+Y+Z’)(X’+Y’)
  • XYZ’+X’Y’

Most demultiplexers facilitate which type of conversion?

  • Odd parity to even parity
  • Single input, multiple outputs
  • Decimal-to-hexadecimal
  • AC to DC

The truth table for an S-R flip-flop has how many VALID entries?

  • 2
  • 1
  • 3
  • 4

The ________ gate is an OR gate followed by a NOT gate.

  • EXOR
  • EXNOR
  • NOR
  • NAND

What could be the maximum value of a single digit in an octal number system?

  • 6
  • 7
  • 8
  • 5

The input hexadecimal representation of 1110 is _______________

  • E
  • 14
  • 0111
  • 15

The 32 bit representation of the decimal number is called as ____

  • Extended format
  • None of the mentioned
  • Double-precision
  • Single-precision

If a signal passing through a gate is inhibited by sending a LOW into one of the inputs, and the output is HIGH, the gate is aNo:

  • NAND
  • NOR
  • AND
  • OR

For the device shown here, assume the D input is LOW, both S inputs are LOW and the input is LOW. What is the status of the Y’ outputs?

  • All are HIGH
  • All but Y0 are LOW
  • All are LOW
  • All but Y0 are HIGH

Which of the following is not a binary number?

  • 101
  • 000
  • 1111
  • 11E

The Boolean expression for a 3-input AND gate is ________.

  • X = A + B + C
  • X = ABC
  • X = AB
  • X = AB + C

For voice, each channel contains a ___ word of digitized data.

  • 1
  • 2
  • 4
  • 0

Convert 111 110 010 from base 2 to base 8

  • 215
  • 762
  • 125
  • 672

The result obtained on subtraction using 2’s complement of 1111-0010 will be _________

  • 11011
  • 1011
  • 11101
  • 1101

A technique that can be a solution to the problem of synchronizing data sources.

  • pulse stuffing
  • data link control
  • framing
  • full link control

If a 3-input NOR gate has eight input possibilities, how many of those possibilities will result in a HIGH output?

  • 7
  • 2
  • 1
  • 8

It is rooted in binary code, a series of zeroes and ones each having an opposite value.

  • Numeric System
  • Decimal Base
  • Radix Number System
  • Digital Logic

The decimal value 0.5 in IEEE single precision floating point representation has

  • fraction bits of 100…000 and exponent value of 0
  • fraction bits of 000…000 and exponent value of −1
  • fraction bits of 000…000 and exponent value of 0

For a two-input XNOR gate, with the input waveforms as shown below, which output waveform is correct?

  • a
  • b
  • c
  • d

Convert the binary equivalent 10101 to its decimal equivalent.

  • 31
  • 22
  • 21
  • 12

>> operator is used to denote _________

  • less than
  • greater than
  • right shift
  • left shift

What does the symbol D represent in a hexadecimal number system?

  • 8
  • 14
  • 13
  • 16

It is possible for an enable or strobe input to undergo an expansion of two or more MUX ICs to the digital multiplexer with the proficiency of large number of ___________

  • Inputs
  • Selection lines
  • Enable lines
  • Outputs

What is the 1’s complement of 11010?

  • 11011
  • 00101
  • 11010
  • 00110

A basic S-R flip-flop can be constructed by cross-coupling of which basic logic gates?

  • AND or OR gates
  • XOR or XNOR gates
  • AND or NOR gates
  • NOR or NAND gates

The binary equivalent of the decimal number 10 is __________

  • 1010
  • 10
  • 0010
  • 010

Which of the following is not a visible register?

  • Address Register
  • General Purpose Registers
  • MAR
  • Status Register

In this type of multiplexing time slots are preassigned to sources and fixed.

  • Asynchronous TDM
  • FDM
  • Synchronous TDM
  • TDM

There are 5 universal gates.

  • True
  • False

The 1’s complement of 1111111110.101 is _______________

  • 1.101
  • 1111111110.101
  • 0000000000.010
  • 1.010

A ____________ is a circuit with only one output but can have multiple inputs.

  • Truth table
  • Logic gate
  • Binary circuit
  • Boolean circuit

Many time slots are wasted in __________

  • FDM
  • Synchronous TDM
  • TDM
  • Asynchronous TDM

The octal equivalent of 1100101.001010 is ______

  • 624.12
  • 145.12
  • 154.12
  • 145.21

A computer language that is written in binary codes only is _____

  • C
  • Pascal
  • C#
  • machine language

How many select lines would be required for an 8-line-to-1-line multiplexer?

  • 3
  • 8
  • 4
  • 2

Which of the following is a data transfer instruction?

  • RET
  • STA 16-bit address
  • ADD A, B
  • MUL C, D

The minterm of any expression is denoted by ___________

  • Mt
  • m
  • min

Which combinational circuit is renowned for selecting a single input from multiple inputs & directing the binary information to output line?

  • DeMultiplexer
  • Both data selector and data distributor
  • Data Selector
  • Data distributor

In 1-to-4 demultiplexer, how many select lines are required?

  • 5
  • 3
  • 4
  • 2

The 16’s complement of 74E will be __________

  • F8B2
  • 2B8
  • 8B2
  • 8C2

The output of an AND gate with three inputs, A, B, and C, is HIGH when ________.

  • A = 1, B = 1, C = 0
  • A = 1, B = 1, C = 1
  • A = 1, B = 0, C = 1
  • A = 0, B = 0, C = 0

A system in which two channels are dedicated to transfer data.

  • TV
  • Cable
  • Cable modem
  • Modem

How many AND gates are required to realize the following expression Y=AB+BC?

  • 4
  • 8
  • 2
  • 1

Boolean Function is of the form of ________

  • Truth values
  • Algebraic Expression
  • Truth Table
  • K=f(X,Y,X)

The logic circuits whose outputs at any instant of time depends only on the present input but also on the past outputs are called

  • Combinational circuits
  • Latches
  • Sequential circuits
  • Flip-flops

The normalized representation of 0.0010110 * 2 9 is _______

  • 0 10101010 1110
  • 0 10001000 0010110
  • 0 10000101 0110
  • 0 11110100 11100

Which of the following is not a positional number system?

  • Hexadecimal Number System
  • Roman Number System
  • Binary Number System
  • Octal Number System

The word demultiplex means ___________

  • One into many
  • Distributor
  • One into many as well as Distributor
  • Many into one

P is a 16-bit signed integer. The 2's complement representation of P is (F87B)16.The 2's complement representation of 8*P

  • (C3D8)16
  • (F878)16
  • (987B)16
  • (187B)16

Convert (52)16 into its decimal equivalent.

  • 80
  • 28
  • 82
  • 83

The general form for calculating the number of rows in a truth table is ________

  • 2n
  • -2n
  • 2n+1
  • 2n-1

The format used to present the logic output for the various combinations of logic inputs to a gate is called aNo:

  • Boolean variable
  • truth table
  • Boolean constant
  • input logic function

Output will be a LOW for any case when one or more inputs are zero for aNo:

  • NOR Gate
  • OR Gate
  • AND Gate
  • NOT Gate

The smallest integer that can be represented by an 8-bit number in 2’s complement form is

  • -128
  • -127
  • 0
  • -256

How many AND, OR and EXOR gates are required for the configuration of full adder?

  • 3, 1, 2
  • 1, 2, 2
  • 2, 1, 2
  • 4, 0, 1

Which is the major functioning responsibility of the multiplexing combinational circuit?

  • Decoding the binary information
  • Generation of selected path between multiple sources and a single destination
  • Generation of all minterms in an output function with OR-gate
  • Encoding of binary information

The number of literals in the expression F=X.Y’ + Z are _____________

  • 3
  • 4
  • 2
  • 1

The output of a NOR gate is HIGH if ________.

  • any input is LOW
  • all inputs are HIGH
  • any input is HIGH
  • all inputs are LOW

What is the complement of X’Y’Z?

  • XYZ’
  • X+Y+Z’
  • X’+Y+’Z’
  • X+YZ

In the IEEE floating point representation, the hexadecimal value 0 × 00000000 corresponds to

  • the normalized value +0
  • the special value +0
  • the normalized value 2-127
  • the normalized value 2-126

In the hexadecimal system, we allow _______ values for each digit of a number

  • 2
  • 16
  • 8
  • 10

A digital multiplexer is a combinational circuit that selects ___________

  • Many decimal inputs and transmits the selected information
  • One digital information from several sources and transmits the selected one
  • Many digital information and convert them into one
  • Many decimal outputs and accepts the selected information

New CPU whose instruction set includes the instruction set of its predecessor CPU is said to be ___________ with its predecessor.

  • fully compatible
  • backward compatible
  • compatible
  • forward compatible

Convert the binary number 11001 to decimal.

  • 3
  • 25
  • 15
  • 13

How many types of sequential circuits are?

  • 5
  • 2
  • 4
  • 3

What is the indication of a short to ground in the output of a driving gate?

  • There is a signal loss to all load gates
  • Only the output of the defective gate is affected
  • The affected node will be stuck in the HIGH state
  • The node may be stuck in either the HIGH or the LOW state

What is the function of an enable input on a multiplexer chip?

  • To connect ground
  • To apply Vcc
  • To active one half of the chip
  • To active the entire chip

In a number system, each position of a digit represents a specific power of the base.

  • True
  • False
  • 82 * 1 + 81 * 1 + 80 *3.

The binary number 1110 in hexadecimal format is _____________

  • 15
  • 14
  • 6
  • E

When both inputs of a J-K flip-flop cycle, the output will ___________

  • Be invalid
  • Toggle
  • Change
  • Not change

WDM stands for?

  • Wavelength division multiplexing
  • Wave division multiplexing
  • Wave dependent multiplexing
  • Wavelength dependent multiplexing

The result of X+X.Y is X.

  • True
  • False

The output of an OR gate with three inputs, A, B, and C, is LOW when ________.

  • all of the above
  • A = 0, B = 1, C = 1
  • A = 0, B = 0, C = 1
  • A = 0, B = 0, C = 0

Which of the following is correct for a gated D-type flip-flop?

  • The output complement follows the input when enabled
  • Only one of the inputs can be HIGH at a time
  • The output toggles if one of the inputs is held HIGH
  • The Q output is either SET or RESET as soon as the D input goes HIGH or LOW

The carry propagation can be expressed as ________

  • Cp = AB
  • All but Y0 are LOW
  • Cp = A + B
  • All but Y0 are HIGH

The _________ holds the contents of the accessed memory word.

  • PC
  • MBR
  • IR
  • MAR

Which of the following gates has the exact inverse output of the OR gate for all possible input combinations?

  • AND
  • NOR
  • NAND
  • NOT

ABC is a valid hexadecimal number.

  • True
  • False

2’s complement is obtained by adding 1 to 1’s complement of a number.

  • True
  • False

Let r denote number system radix. The only value(s) of r that satisfy the equation 12

  • any value > 2
  • decimal 10
  • decimal 11
  • decimal 10 and 11

Number of outputs in a half adder _____________

  • 1
  • 3
  • 2
  • 0

The min term when X=Y=Z=0 is _____________

  • x’+y’+z’
  • x+y+z
  • xyz
  • x’y’z’

One example of the use of an S-R flip-flop is as ___________

  • Switch debouncer
  • Racer
  • Transition pulse generator
  • Astable oscillator

A technique that allocates time slots dynamically.

  • Statistical TDM
  • TDM
  • WDM
  • Dynamic TDM

Which of the following combinations of logic gates can decode binary 1101?

  • One 4-input NAND gate, one inverter
  • One 4-input AND gate, one OR gate
  • One 4-input AND gate
  • One 4-input AND gate, one inverter

Why is a demultiplexer called a data distributor?

  • One of the inputs will be selected for the output
  • The input will be distributed to one of the outputs
  • Single input to Single Output
  • The output will be distributed to one of the inputs

In this technique, there is a link between subscriber and network and a local loop.

  • DSDL
  • SSDL
  • TSDL
  • ASDL

If a 3-input AND gate has eight input possibilities, how many of those possibilities will result in a HIGH output?

  • 2
  • 7
  • 1
  • 8

One multiplexer can take the place of ___________

  • Several Ex-NOR gates
  • Several SSI logic gates or combinational logic circuits
  • Combinational logic circuits
  • Several SSI logic gates

What is correct instruction if you want the control to go to the location 2000h?

  • RET 2000h
  • JMP 2000h
  • MOV 2000h
  • MOV A, 2000h

A bit in a computer terminology means either 0 or 1.

  • True
  • False

What kind of a flag is the sign flag?

  • Status
  • Instruction
  • General Purpose
  • Address

The length of a register is called _______

  • word size
  • word limit
  • register limit
  • register size

In TDM, the samples occupy adjacent time slots.

  • True
  • False

Latches constructed with NOR and NAND gates tend to remain in the latched condition due to which configuration feature?

  • Synchronous operation
  • Gate impedance
  • Low input voltages
  • Cross coupling

The numbers written to the power of 10 in the representation of decimal numbers are called as _____

  • Size factors
  • Height factors
  • Scale factors
  • None of the mentioned

Controlling the frequency is referred as _________

  • phase modulation
  • hertz modulation
  • amplitude modulation
  • frequency modulation

Opcode indicates the operations to be performed.

  • True
  • False

Which of the following logic expressions represents the logic diagram shown?

  • X=A’B’+AB
  • X=(AB)’+A’B’
  • X=(AB)’+AB
  • X=AB’+A’B

Which of the following correctly describes the distributive law.

  • (AB)(A+B)=AB
  • (A+B).C=AC+BC
  • ( A+B)(C+D)=AB+CD
  • (A.B)C=AC.AB

What is a multiplexer?

  • It is a type of decoder which decodes several inputs and gives one output
  • A multiplexer is a device which converts many signals into one
  • It is a type of encoder which decodes several inputs and gives one output
  • It takes one input and results into many output

The maximum number of bits sufficient to represent a hexadecimal number in binary:

  • 3
  • 8
  • 7
  • 4

The number of sign bits in a 32-bit IEEE format __________

  • 1
  • 11
  • 9
  • 23
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