Q.1

A typical AHDL comparator follows an algorithm described as ________.

  • FUNCTION constructs
  • CASE constructs
  • IF/ELSE constructs
  • PROCESS constructs
Q.2

A(n) ________ has a number of input lines, only one of which is activated at a given time, and produces on N-bit output code, depending on which input is activated.

  • encoder
  • code converter
  • demultiplexer
  • decoder
Q.3

An everyday illustration of a multiplexer is ________.

  • the volume control in a stereo receiver
  • the function switch on a stereo receiver
  • the balance control on a stereo receiver
  • the treble-bass control on a stereo receiver
Q.4

A(n) ________ display controls the reflection of available light.

  • MOS
  • LCD
  • LED
  • LSC
Q.5

The data transmission system shown in below has a problem; the parity error output is always high. A logic analyzer is used to examine the system and shows that the DATA IN on the left matches the DATA OUT on right. What might be causing the problem?

  • The error gate could be defective.
  • The storage circuit could be defective.
  • The parity checker could be bad.
  • Any of the above.
Q.6

The IEEE/ANSI symbol for a decoder has the internal designation bcd/dec. This means the decoder is a:

  • decimal-to-BCD decoder with ten inputs and four outputs.
  • BCD-to-decimal decoder with ten inputs and four outputs.
  • decimal-to-BCD decoder with four inputs and ten outputs.
  • BCD-to-decimal decoder with four inputs and ten outputs.
Q.7

How is the number one (1) indicated on the outputs of a 7447 BCD-to-seven-segment code converter?

  • Segment a is active.
  • Segment b is active.
  • Segments a and b are active.
  • Segments b and c are active.
Q.8

Another name for a multiplexer is ________.

  • encoder
  • decoder
  • code converter
  • data selector
Q.9

In HDL, the operation of the DEMUX is exactly described using a ________.

  • function
  • process
  • variable type
  • number of conditional signal assignment statements
Q.10

The binary value of the BCD number 1000 0001 (81) is ________.

  • 0101 0001
  • 0110 0011
  • 0100 0001
  • 1000 0000
Q.11

A decimal-to-BCD encoder has ________ data inputs.

  • two
  • four
  • five
  • ten
Q.12

The device that places its input data onto one of several outputs is a ________.

  • demultiplexer
  • multiplexer
  • comparator
  • counter
Q.13

Which statement below best describes the function of a decoder?

  • A decoder will convert a decimal number into the proper binary equivalent.
  • A decoder will convert a binary number into a specific output representing a particular character or digit.
  • Decoders are used to prevent improper operation of digital systems.
  • Decoders are special ICs that are used to make it possible for one brand of computer to talk to another.
Q.14

When data input I5 of a 74148 octal-to-binary encoder is active, the data output is:
A0 = 1
A1 = 0
A2 = 0

  • True
  • False
Q.15

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

  • True
  • False
Q.16

Multiplexing of digital signals is usually required when:

  • moving data internally within a microprocessor.
  • moving data between memory and storage registers in a microprocessor.
  • moving data over long distance transmission lines.
  • moving data internally within a microprocessor or between memory and storage registers.
Q.17

When an application, such as an encoder, calls for a unique response from a circuit corresponding to a combination of its input variables, the two methods that best serve this purpose are the ________ and the ________.

  • CASE construct, truth TABLE
  • if then statement, elsif statement
  • VARIABLE, PROCESS
  • FUNCTION, TYPE
Q.18

A(n) ________ is a logic circuit that accepts a set of inputs that represents a binary number, and activates only the output that corresponds to that input number.

  • decoder
  • LED
  • encoder
  • demultiplexer
Q.19

The normal outputs of a magnitude comparator are ________.

  • A < B, A = B, and A > B
  • Sum, difference, and carry
  • Cin, Cout, and Sum
  • A = B, A + B, and carry
Q.20

What must be done in the given figure in order to use two 7485 4-bit comparators to compare two 8-bit numbers?

  • The P < Q, P = Q, and P > Q outputs of COMP A must be connected to the same outputs of COMP B.
  • The P < Q, P = Q, and P > Q outputs of COMP A must be connected to the inputs of COMP B.
  • The = input of COMP A must be connected to Vcc, and the < and > inputs must be connected to ground.
  • The P < Q, P = Q, and P > Q outputs of COMP A must be connected to the inputs of COMP B, the = input of COMP A must be connected to Vcc, and the inputs must be connected to ground.
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