Digital Electronics Multiple Choice Questions and Answers

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