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MCQs

Total Questions : 88 | Page 3 of 9 pages
Question 21. . The special software application that translates from HDL into a grid of 1's and 0's, which can be loaded into a PLD, is called a:
  1.    formatter.
  2.    compiler.
  3.    programmable wiring.
  4.    CPU.
 Discuss Question
Answer: Option B. -> compiler.
Question 22. . ________ is a correct combination for an ODD-parity data transmission system.
  1.    data = 1101 1011 parity = 1
  2.    data = 1101 0010 parity = 0
  3.    data = 0001 0101 parity = 1
  4.    data = 1010 1111 parity = 0
 Discuss Question
Answer: Option A. -> data = 1101 1011 parity = 1
Question 23. . A circuit that can convert one of ten numerical keys pressed on a keyboard to BCD is a ________.
  1.    priority encoder
  2.    decoder
  3.    multiplexer
  4.    demultiplexer
 Discuss Question
Answer: Option A. -> priority encoder
Question 24. . A half-adder does not have ________.
  1.    carry in
  2.    carry out
  3.    two inputs
  4.    all of the above
 Discuss Question
Answer: Option A. -> carry in
Question 25. . When an open occurs on the input of a TTL device, the output will ________.
  1.    go LOW, because there is no current in an open circuit
  2.    react as if the open input were a HIGH
  3.    go HIGH, since full voltage appears across an open
  4.    still be good, if only the good inputs are used
 Discuss Question
Answer: Option B. -> react as if the open input were a HIGH
Question 26. . The ________ prefix on IC's indicates a broader operating temperature range, and the devices are generally used by the military.
  1.    54
  2.    2N
  3.    74
  4.    TTL
 Discuss Question
Answer: Option A. -> 54
Question 27. . The largest truth table that can be implemented directly with an 8-line-to-1-line MUX has ________.
  1.    3 rows
  2.    4 rows
  3.    8 rows
  4.    16 rows
 Discuss Question
Answer: Option C. -> 8 rows
Question 28. . Parity generation and checking is used to detect ________.
  1.    which of two numbers is greater
  2.    errors in binary data transmission
  3.    errors in arithmetic in computers
  4.    when a binary counter counts incorrectly
 Discuss Question
Answer: Option B. -> errors in binary data transmission
Question 29. . A gate that could be used to compare two logic levels and provide a HIGH output if they are equal is a(n) ________.
  1.    XOR gate
  2.    XNOR gate
  3.    NAND gate
  4.    NOR gate
 Discuss Question
Answer: Option B. -> XNOR gate
Question 30. . Except for ________, STD_LOGIC may have the following values.
  1.    'z'
  2.    'U'
  3.    '?'
  4.    'L'
 Discuss Question
Answer: Option C. -> '?'

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