# Combinational Circuits – Exercise – 6

251. The inputs/outputs of an analog multiplexer/demultiplexer are: (a) bidirectional (b) unidirectional (c) even parity (d) binary-coded decimal

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252. Most demultiplexers facilitate which type of conversion? (a) decimal-to-hexadecimal (b) single input, multiple outputs (c) ac to dc (d) odd parity to even parity

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253. What is the function of an enable input on a multiplexer chip? (a) to apply Vcc (b) to connect ground (c) to active the entire chip (d) to active one half of the chip

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254. What is the status of the inputs S0, S1, and S2 of the 74151 eight-line multiplexer in order for the output Y to be a copy of input I5? (a) S0 = 0, S1 = 1, S2 = 0 (b) S0 = 0, S1 = 0, S2 = 1 (c) S0 = 1, S1 = 1, S2 = 0 (d) S0 = 1, S1 = 0, S2 = 1

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255. One multiplexer can take the place of: (a) several SSI logic gates (b) combinational logic circuits (c) several Ex-NOR gates (d) several SSI logic gates or combinational logic circuits