MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -The 2×1 multiplexer has only 1 selection line. For getting 8 data inputs, we need two 4×1 multiplexers. The 4×1 multiplexer produces one output. So, in order to get the final output, we need a 2×1 multiplexer.

Detailed explanation-2: -We know that 4x1 Multiplexer has 4 data inputs, 2 selection lines and one output. Whereas, 8x1 Multiplexer has 8 data inputs, 3 selection lines and one output. So, we require two 4x1 Multiplexers in first stage in order to get the 8 data inputs.

Detailed explanation-3: -Usually they have several inputs and several outputs that form an open matrix. Loading a specific code word can connect one input to several outputs simultaneously.

Detailed explanation-4: -These two control lines can form 4 different combinational logic signals and for each signal one particular input will be selected. So, for instance a 2:1 Multiplexer will have 1 control line because 21 = 2 and a 4:1 Multiplexer will have 2 control lines because 22 = 4.