Q.1

A microcontroller differs from a microprocessor in that it has several ________ ports and ________ built into its architecture, making it better suited for ________ applications.

  • communication, PROMs, control
  • parallel, logic gates, processing
  • input/output, memory, control
  • data, memory, decoding
Q.2

How can the active condition (HIGH or LOW) or the decoder output be determined from the logic symbol?

  • A bubble indicates active-HIGH.
  • A bubble indicates active-LOW.
  • A square indicates active-HIGH.
  • A square indicates active-LOW.
Q.3

How is an encoder different from a decoder?

  • The output of an encoder is a binary code for 1-of-N input.
  • The output of a decoder is a binary code for 1-of-N input.
Q.4

If two inputs are active on a priority encoder, which will be coded on the output?

  • the higher value
  • the lower value
  • neither of the inputs
  • both of the inputs
Q.5

Why is the Gray code more practical to use when coding the position of a rotating shaft?

  • All digits change between counts.
  • Two digits change between counts.
  • Only one digit changes between counts.
Q.6

A circuit that responds to a specific set of signals to produce a related digital signal output is called a(n):

  • BCD matrix
  • display driver
  • encoder
  • decoder
Q.7

For the following conditions on a 7485 magnitude comparator, what will be the state of each of the three outputs?

A0 = 0B0 = 1IA < B = 0
A1 = 1B1 = 0IA = B = 1
A2 = 1B2 = 0IA > B = 0
A3 = 0B3 = 0 
  • A = B = 0, A < B = 0, A > B = 1
  • A = B = 0, A < B = 1, A > B = 0
  • A = B = 1, A < B = 0, A > B = 0
  • A = B = 0, A < B = 0, A > B = 0
Q.8

How many 74184 BCD-to-binary converters would be required to convert two complete BCD digits to a binary number?

  • 8
  • 4
  • 2
  • 1
Q.9

When two or more inputs are active simultaneously, the process is called:

  • first-in, first-out processing
  • priority encoding
  • ripple blanking
  • first-in, first-out processing or priority encoding
Q.10

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

  • 2
  • 3
  • 4
  • 8
Q.11

A BCD decoder will have how many rows in its truth table?

  • 10
  • 9
  • 8
  • 3
Q.12

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

  • to apply Vcc
  • to connect ground
  • to active the entire chip
  • to active one half of the chip
Q.13

How many possible outputs would a decoder have with a 6-bit binary input?

  • 16
  • 32
  • 64
  • 128
Q.14

One application of a digital multiplexer is to facilitate:

  • data generation
  • serial-to-parallel conversion
  • parity checking
  • data selector
Q.15

The expansion inputs to a comparator are used for expansion to a(n):

  • 4-bit system
  • 8-bit system
  • BCD system
  • counter system
Q.16

A principle regarding most IC decoders is that when the correct input is present, the related output will switch:

  • active-HIGH
  • to a high impedance
  • to an open
  • active-LOW
Q.17

How many outputs are on a BCD decoder?

  • 4
  • 16
  • 8
  • 10
Q.18

Most demultiplexers facilitate which type of conversion?

  • decimal-to-hexadecimal
  • single input, multiple outputs
  • ac to dc
  • odd parity to even parity
Q.19

The primary use for Gray code is:

  • coded representation of a shaft's mechanical position
  • turning on/off software switches
  • to represent the correct ASCII code to indicate the angular position of a shaft on rotating machinery
  • to convert the angular position of a shaft on rotating machinery into hexadecimal code
Q.20

Why is a demultiplexer called a data distributor?

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