Digital Electronics and Logic Design MCQs with answers Page - 35

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Q. In VHDL, macrofunctions is/are:

  • (A) digital circuits.
  • (B) analog circuits.
  • (C) a set of bit vectors.
  • (D) preprogra mmed ttl devices.

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Q. Which of the following expressions is in the product-of-sums form?

  • (A) (a + b )(c + d )
  • (B) (ab )(cd )
  • (C) ab (cd )
  • (D) ab + cd

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Q. Which of the following is an important feature of the sum-of-products form of expressions?

  • (A) all logic circuits are reduced to nothing more than simple and and or operations.
  • (B) the delay times are greatly reduced over other forms.
  • (C) no signal must pass through more than two gates, not including inverters.
  • (D) the maximum number of gates that any signal must pass through is reduced by a factor of two.

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Q. An output gate is connected to four input gates; the circuit does not function. Preliminary tests with the DMM indicate that the power is applied; scope tests show that the primary input gate has a pulsing signal, while the interconnecting node has no signal. The four load gates are all on different ICs. Which instrument will best help isolate the problem?

  • (A) current tracer
  • (B) logic probe
  • (C) oscilloscope
  • (D) logic analyzer

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Q. The binary numbers A = 1100 and B = 1001 are applied to the inputs of a comparator. What are the output levels?

  • (A) a > b = 1, a < b = 0, a < b = 1
  • (B) a > b = 0, a < b = 1, a = b = 0
  • (C) a > b = 1, a < b = 0, a = b = 0
  • (D) a > b = 0, a < b = 1, a = b = 1

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Q. A logic probe is placed on the output of a gate and the display indicator is dim. A pulser is used on each of the input terminals, but the output indication does not change. What is wrong?

  • (A) the output of the gate appears to be open.
  • (B) the dim indication on the logic probe indicates that the supply voltage is probably low.
  • (C) the dim indication is a result of a bad ground connection on the logic probe.
  • (D) the gate may be a tristate device.

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Q. Each "1" entry in a K-map square represents:

  • (A) a high for each input truth table condition that produces a high output.
  • (B) a high output on the truth table for all low input combination s.
  • (C) a low output for all possible high input conditions.
  • (D) a don care condition for all possible input truth table combinati ons.

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Q. Looping on a K-map always results in the elimination of:

  • (A) variables within the loop that appear only in their complemented form.
  • (B) variables that remain unchanged within the loop.
  • (C) variables within the loop that appear in both complemente d and uncompleme nted form.
  • (D) variables within the loop that appear only in their uncomple mented form.

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Q. What will a design engineer do after he/she is satisfied that the design will work?

  • (A) put it in a flow chart
  • (B) program a chip and test it
  • (C) give the design to a technician to verify the design
  • (D) perform a vector test

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Q. The 7447A is a BCD-to-7-segment decoder with ripple blanking input and output functions. The purpose of these lines is to .

  • (A) turn off the display for any nonsignificant digit
  • (B) turn off the display for any zero
  • (C) turn off the display for leading or trailing zeros
  • (D) test the display to assure all segments are operationa l

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