Q.1

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.2

One can safely state that the output lines for a demultiplexer are under the direct control of the:

  • input data select lines.
  • the internal AND gates.
  • the internal OR gate.
  • Input data line.
Q.3

Basically, a multiplexer changes parallel data inputs to a serial output.

  • True
  • False
Q.4

Incandescent 7-segment displays are especially well suited for use in portable battery-operated devices.

  • True
  • False
Q.5

A device that selects one of several inputs to be placed on the output is a multiplexer.

  • True
  • False
Q.6

A(n) ________ is a combinational logic circuit that compares two input binary quantities and generates outputs to indicate which one has the greater magnitude.

  • demultiplexer
  • code converter
  • magnitude comparator
  • E-MOS
Q.7

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

  • demultiplexer
  • multiplexer
  • comparator
  • counter
Q.8

In HDL, a process is usually thought of as a wire connecting two points in a circuit.

  • True
  • False
Q.9

A demultiplexer is a device that converts some code to a recognizable number or character.

  • True
  • False
Q.10

A device that determines which of two numbers is greater is a comparator.

  • True
  • False
Q.11

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

  • four
  • three
  • two
  • one
Q.12

An eight-line multiplexer must have as inputs ________.

  • four data inputs and three select inputs
  • eight data inputs and two select inputs
  • eight data inputs and three select inputs
  • eight data inputs and four select inputs
Q.13

Incandescent 7-segment displays are especially well suited for use in portable battery-operated devices.

  • 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

Modern computers transfer data between different devices over a common set of connecting lines called a data bus.

  • True
  • False
Q.16

A very important attribute of the conditional signal assignment statement is its sequential operation.

  • True
  • False
Q.17

The device that is an application of SOP logic is a multiplexer.

  • True
  • False
Q.18

A logic circuit that determines if one input is equal to another is called a comparator.

  • True
  • False
Q.19

If by chance more than one of the inputs in an HDL encoder is activated at the same time, the priority encoder ________.

  • enters a fault mode
  • ignores the least significant input
  • resamples the data
  • finds some other input
Q.20

Output 6 of a 74138 octal decoder is selected when it is enabled by a data input of:

A0 = 1
A1 = 1
A2 = 0

  • True
  • False
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