Digital Electronics and Logic Design MCQs with answers Page - 46

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Q. Which statement below best describes a Karnaugh map?

  • (A) a karnaugh map can be used to replace boolean rules.
  • (B) the karnaugh map eliminates the need for using nand and nor gates.
  • (C) variable complements can be eliminated by using karnaugh maps.
  • (D) karnaugh maps provide a visual approach to simplifyin g boolean expression s.

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Q. A certain BCD-to-decimal decoder has active-HIGH inputs and active- LOW outputs. Which output goes LOW when the inputs are 1001?

  • (A) 0
  • (B) 3
  • (C) 9
  • (D) none. all outputs are high.

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Q. A full-adder has a Cin = 0. What are the sum and the carry (Cout) when A = 1 and B = 1?

  • (A) = 0, cout = 0
  • (B) = 0, cout = 1
  • (C) = 1, cout = 0
  • (D) = 1, cout = 1

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Q. When adding an even parity bit to the code 110010, the result is .

  • (A) 1110010
  • (B) 110010
  • (C) 1111001
  • (D) 1101

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Q. Which of the following combinations of logic gates can decode binary 1101?

  • (A) one 4-input and gate
  • (B) one 4-input and gate, one or gate
  • (C) one 4-input nand gate, one inverter
  • (D) one 4- input and gate, one inverter

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Q. What is the indication of a short to ground in the output of a driving gate?

  • (A) only the output of the defective gate is affected.
  • (B) there is a signal loss to all load gates.
  • (C) the node may be stuck in either the high or the low state.
  • (D) the affected node will be stuck in the high state.

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Q. How many outputs would two 8-line-to-3-line encoders, expanded to a 16-line-to-4-line encoder, have?

  • (A) 3
  • (B) 4
  • (C) 5
  • (D) 6

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Q. A half-adder does not have .

  • (A) carry in
  • (B) carry out
  • (C) two inputs
  • (D) all of the above

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Q. A circuit that can convert one of ten numerical keys pressed on a keyboard to BCD is a .

  • (A) priority encoder
  • (B) decoder
  • (C) multiplexer
  • (D) demultiple xer

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Q. When an open occurs on the input of a TTL device, the output will .

  • (A) go low, because there is no current in an open circuit
  • (B) react as if the open input were a high
  • (C) go high, since full voltage appears across an open
  • (D) still be good, if only the good inputs are used

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