Digital Electronics MCQ Questions and Answers Quiz

31. The output of an OR gate is LOW when ________.

  1. Any input is LOW
  2. Any input is HIGH
  3. All inputs are HIGH
  4. All inputs are LOW

32. The Ex-NOR is sometimes called the ________.

  1. Parity gate
  2. Equality gate
  3. Inverted OR
  4. Parity gate or the equality gate

33. A logic circuit that provides a HIGH output if one input or the other input, but not both, is HIGH, is a(n):

  1. Ex-NOR gate
  2. OR gate
  3. Ex-OR gate
  4. NAND gate

34. The output of an AND gate with three inputs, A, B, and C, is HIGH when ________.

  1. A = 1, B = 1, C = 0
  2. A = 0, B = 0, C = 0
  3. A = 1, B = 1, C = 1
  4. A = 1, B = 0, C = 1

35. When used with an IC, what does the term "QUAD" indicate?

  1. 2 circuits
  2. 4 circuits
  3. 6 circuits
  4. 8 circuits1

36. The output of an OR gate with three inputs, A, B, and C, is LOW when ________.

  1. A = 0, B = 0, C = 0
  2. A = 0, B = 0, C = 1
  3. LA = 0, B = 1, C = 1
  4. All of the above

37. Which of the following logical operations is represented by the + sign in Boolean algebra?

  1. Inversion
  2. AND
  3. OR
  4. Complementation

38. Output will be a LOW for any case when one or more inputs are zero for a(n):

  1. OR gate
  2. NOT gate
  3. AND gate
  4. NOR gate

39. A basic multiplexer principle can be demonstrated through the use of a:

  1. Single-pole relay
  2. DPDT switch
  3. Rotary switch
  4. Linear stepper

40. One multiplexer can take the place of:

  1. Several SSI logic gates
  2. Combinational logic circuits
  3. Several Ex-NOR gates
  4. Several SSI logic gates or combinational logic circuits
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MCQ Multiple Choice Questions and Answers on Digital Electronics

Digital Electronics Question and Answer