Electrical Engineering XYZ MCQs
A three-state buffer has the following output states:
- High, Low, Float
- 1, 0, float
- Both 1 and 2
- Set, Reset, Halt
Correct answer: 3. Both 1 and 2
Explanation: A three-state buffer is a digital circuit that can have three possible output states: High (1), Low (0), and Float. Let’s break down the options:
- High, Low, Float: This is a correct description of the output states of a three-state buffer. The buffer can be in a high state (outputting a logic 1), low state (outputting a logic 0), or it can be in a high-impedance state (Float), where the output is effectively disconnected.
- 1, 0, float: This is also correct and corresponds to the standard notation for the logic levels – 1 for High, 0 for Low, and “float” for the high-impedance state.
- Both 1 and 2: This is the correct answer because options 1 and 2 are essentially the same.
- Set, Reset, Halt: These terms are typically associated with flip-flops or latches rather than three-state buffers. Set and Reset refer to the states where the output is forced to a particular logic level, and Halt is not a standard state for a three-state buffer.