Describing Logic Circuits Questions and Answers

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Q1
The format used to present the logic output for the various combinations of logic inputs to a gate is called a(n):
  • A truth table.
  • B input logic function.
  • C Boolean constant.
  • D Boolean variable.
Answer: Option A
Q2
What is the basic difference between AHDL and VHDL?
  • A ADHL is used in all PLD's.
  • B VHDL is used in all PLD's.
  • C ADHL is proprietary.
  • D VHDL is proprietary.
Answer: Option C
Q3
small circle on the output of a logic gate is used to represent the:
  • A Comparator operation.
  • B OR operation.
  • C NOT operation.
  • D AND operation.
Answer: Option C
Q4
In VHDL, the mode of a port does not define:
  • A an input.
  • B an output.
  • C both an input and an output.
  • D the TYPE of the bit.
Answer: Option D
Q5
Which of the following equations would accurately describe a 4-input OR gate when A = 1, B = 1, C = 0, and D = 0?
  • A 1 + 1 + 0 + 0 = 1
  • B 1 + 1 + 0 + 0 = 01
  • C 1 + 1 + 0 + 0 = 0
  • D 1 + 1 + 0 + 0 = 00
Answer: Option A
Q6
Which of the examples below expresses the distributive law?
  • A (A + B) + C = A + (B + C)
  • B A(B + C) = AB + AC
  • C A + (B + C) = AB + AC
  • D A(BC) = (AB) + C
Answer: Option B
Q7
How are the statements between BEGIN and END not evaluated in VHDL?
  • A Constantly
  • B Simultaneously
  • C Concurrently
  • D Sequentially
Answer: Option D
Q8
A NOR gate with one HIGH input and one LOW input:
  • A will output a HIGH
  • B functions as an AND
  • C will not function
  • D will output a LOW
Answer: Option D
Q9
A NAND gate has:
  • A active-LOW inputs and an active-HIGH output.
  • B active-LOW inputs and an active-LOW output.
  • C active-HIGH inputs and an active-HIGH output.
  • D active-HIGH inputs and an active-LOW output.
Answer: Option D
Q10
The logic gate that will have HIGH or "1" at its output when any one of its inputs is HIGH is a(n):
  • A NOR gate
  • B OR gate
  • C AND gate
  • D NOT operation
Answer: Option B

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