Q.1

A binary code that progresses such that only one bit changes between two successive codes is:

  • nine's-complement code
  • 8421 code
  • excess-3 code
  • Gray code
Q.2

What do the mathematical symbols A < b and A > B mean?

  • A < B means A is greater than B. A > B means A is less than B.
  • A > B means A is less than B. A < B means A is greater than B.
  • A < B means A is less than B. A > B means A is greater than B.
Q.3

What control signals may be necessary to operate a 1-line-to-16 line decoder?

  • flasher circuit control signal
  • a LOW on all gate enable inputs
  • input from a hexadecimal counter
  • a HIGH on all gate enable circuits
Q.4

In a Gray code, each number is 3 greater than the binary representation of that number.

  • True
  • False
Q.5

The inputs/outputs of an analog multiplexer/demultiplexer are:

  • bidirectional
  • unidirectional
  • even parity
  • binary-coded decimal
Q.6

What is the status of the inputs S0, S1, and S2 of the 74151 eight-line multiplexer in order for the output Y to be a copy of input I5?

  • S0 = 0, S1 = 1, S2 = 0
  • S0 = 0, S1 = 0, S2 = 1
  • S0 = 1, S1 = 1, S2 = 0
  • S0 = 1, S1 = 0, S2 = 1
Q.7

Which of the following is not a weighted value positional numbering system:

  • hexadecimal
  • binary-coded decimal
  • binary
  • octal
Q.8

A basic multiplexer principle can be demonstrated through the use of a:

  • single-pole relay
  • DPDT switch
  • rotary switch
  • linear stepper
Q.9

One multiplexer can take the place of:

  • several SSI logic gates
  • combinational logic circuits
  • several Ex-NOR gates
  • several SSI logic gates or combinational logic circuits
Q.10

Use the weighting factors to convert the following BCD numbers to binary.

0101 0011        0010 0110 1000

  • 01010011    001001101000
  • 11010100    100001100000
  • 110101        100001100
  • 101011        001100001
Q.11

Why can a CMOS IC be used as both a multiplexer and a demultiplexer?

  • It cannot be used as both.
  • CMOS uses bidirectional switches.
Q.12

One way to convert BCD to binary using the hardware approach is:

  • with MSI IC circuits
  • with a keyboard encoder
  • with an ALU
  • UART
Q.13

How many inputs are required for a 1-of-16 decoder?

  • 2
  • 4
  • 8
  • 16
Q.14

A truth table with output columns numbered 0–15 may be for which type of decoder IC?

  • binary-to-hexadecimal
  • hexadecimal 1-of-16
  • dual octal outputs
  • hexadecimal-to-binary
Q.15

How many inputs will a decimal-to-BCD encoder have?

  • 4
  • 8
  • 10
  • 16
Q.16

How many exclusive-NOR gates would be required for an 8-bit comparator circuit?

  • 4
  • 6
  • 8
  • 10
Q.17

Which digital system translates coded characters into a more useful form?

  • encoder
  • display
  • counter
  • decoder
Q.18

In a BCD-to-seven-segment converter, why must a code converter be utilized?

  • to convert the 4-bit BCD into 7-bit code
  • to convert the 4-bit BCD into 10-bit code
  • to convert the 4-bit BCD into Gray code
  • No conversion is necessary.
Q.19

The digit bus and display bus are each just a common set of conductors shared by the digit storage registers and display segments.

  • True
  • False
Q.20

In a multiplexer, the data select control inputs are responsible for determining which data input is selected to be transmitted to the data output line.

  • True
  • False
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