Digital Concepts Questions and Answers

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Q21
In positive logic, ________.
  • A a HIGH = 1, a LOW = 0
  • B a LOW = 1, a HIGH = 0
  • C only HIGHs are present
  • D only LOWs are present
Answer: Option A
Q22
Convert the fractional binary number 0000.1010 to decimal.
  • A 0.625
  • B 0.50
  • C 0.55
  • D 0.10
Answer: Option A
Q23
Digital representations of numerical values of quantities may BEST be described as having characteristics:
  • A that are difficult to interpret because they are continuously changing
  • B that vary constantly over a continuous range of values.
  • C that vary in constant and direct proportion to the values they represent.
  • D that vary in discrete steps in proportion to the values they represent.
Answer: Option D
Q24
A common instrument used in troubleshooting a digital circuit is a(n) ________.
  • A logic probe
  • B oscilloscope
  • C pulser
  • D all of the above
Answer: Option D
Q25
The parallel transmission of digital data:
  • A is much slower than the serial transmission of data.
  • B requires only one signal line between sender and receiver.
  • C requires as many signal lines between sender and receiver as there are data bits.
  • D is less expensive than the serial method of data transmission.
Answer: Option C
Q26
Convert the fractional decimal number 6.75 to binary.
  • A 0111.1100
  • B 0110.1010
  • C 0110.1100
  • D 0110.0110
Answer: Option C
Q27
What is one relative disadvantage of serial transfer?
  • A It requires too many conductors.
  • B Its interconnect system is complex.
  • C It is slow.
  • D It can only be used over very short distances.
Answer: Option C
Q28
Which format requires fewer conductors?
  • A Parallel
  • B Serial
  • C Both are the same
  • D Cannot tell
Answer: Option B
Q29
A pulse has a period of 15 ms. Its frequency is ________.
  • A 6.66 Hz
  • B 66.66 Hz
  • C 666.66 Hz
  • D 15 Hz
Answer: Option B
Q30
Give the decimal value of binary 10000110.
  • A 13410
  • B 14410
  • C 11010
  • D 12610
Answer: Option A

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