Q.1

When outputs a, b, c, d, and g of a 7447 BCD-to-seven-segment code converter are active, the number displayed is 5.

  • True
  • False
Q.2

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.
Q.3

The select inputs to a multiplexer may also be called address lines.

  • True
  • False
Q.4

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.5

A multiplexer is a device that converts some code into a recognizable number or character.

  • True
  • False
Q.6

ADHL does not offer a multiplication operator.

  • True
  • False
Q.7

A VARIABLE can be thought of as a piece of scrap paper used to write down some numbers that can be used later.

  • True
  • False
Q.8

A circuit that converts some binary code into a singular active output representing its numerical value is a comparator.

  • True
  • False
Q.9

When data input I4 of a 74148 octal-to-binary encoder is active, the data output is:
A0 = 1
A1 = 1
A2 = 0

  • True
  • False
Q.10

A demultiplexer takes an input and turns it into a binary number.

  • True
  • False
Q.11

The outputs of a 7485 four-bit magnitude comparator when the inputs are A = 0110 and B = 1010 are:

A < B is 1
A = B is 0
A > B is 1

  • True
  • False
Q.12

Output 3 of a 74138 octal decoder is selected when it is enabled by a data input of:
A0 = 1
A1 = 1
A2 = 0

  • True
  • False
Q.13

When data input I1 of a 74148 octal-to-binary encoder is active, the data output is:

A0 = 0
A1 = 0
A2 = 1

  • True
  • False
Q.14

For the input values (A0–A3, B0–B3, Data Select = 1) given for the circuit given below, what will be indicated on the displays?

  • A = 0, B = 5
  • A = 5, B = 0
  • A = 6, B = 0
  • A = 0, B = 6
Q.15

The device that generates a coded output from a single active numeric input line is ________.

  • a decoder
  • a multiplexer
  • a comparator
  • an encoder
Q.16

The select inputs to a multiplexer may also be called address lines.

  • True
  • False
Q.17

A 1-of-8 octal decoder has eight outputs and decodes an input of ________ bit(s).

  • three
  • two
  • four
  • one
Q.18

It is normal for more than one decoder output to be active at the same time.

  • True
  • False
Q.19

The device that generates a coded output from a single active numeric input line is ________.

  • a decoder
  • a multiplexer
  • a comparator
  • an encoder
Q.20

The diagram given below shows a ________ being used as a(n) ________ and Y = ________.

  • multiplier, divider, 2.25
  • multiplexer, encoder, 7641
  • multiplexer, logic function generator, ABC + ABC + ABC + ABC
  • logic function generator, multiplexer, 1467
0 h : 0 m : 1 s