Demultiplexer Question & Answers April 1, 2022 By WatElectronics This article lists 50 Demultiplexer MCQs for Engineering Students. All the Demultiplexer Questions & Answers given below includes solution and link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up their fundamentals on the demultiplexer. The demultiplexer is a combinational circuit having one input and many outputs, depending upon the selected inputs the single input transfer to any of the multiple-output. The demultiplexers have the reverse operation as compared to the multiplexer, in the case of multiplexers we have many inputs but single output. The demultiplexers are commonly used in data and clock demultiplexing, memory addressing, four-phase clock generator, switch encoding, serial to parallel converter, etc. The demux has many outputs, enable input and data input. The enable input in demultiplexers decides whether the circuit has to operate or not. If the enable is zero or low the circuit will not be operational and will get zero at all the output terminals, if the enable input is high then the demultiplexer is and data is transferred to any of the output depending on the selected input. The advantage of demultiplexers are they are used as decoders in security systems and increases the communication system efficiency and the disadvantage of demultiplexer is wastage of bandwidth may occur and delay may occur due to synchronization of signals. 1). Which one of the following is known as a data distributor? Demultiplexer Decoder Multiplexer All of the above Hint 2). Which one of the following is a digital switch? Demultiplexer Multiplexer Both a and b None of the above Hint 3). Which one of the following follows the combinational logic type? Demultiplexer Multiplexer Both a and b None of the above Hint Read more about Combinational Logic Circuit 4). Which one of the following works on one to many operational principles? Demultiplexer Multiplexer Both a and b None of the above Hint 5). Which one of the following has single data input and n data outputs? Demultiplexer Multiplexer Both a and b None of the above Hint 6). Where do the demultiplexers use? Receiver Transmitter Both a and b None of the above Hint 7). Which one of the following is also known as data distributor and one to many circuits? Demultiplexer Multiplexer Both a and b None of the above Hint 8). The outputs in a multiplexer depends on _______________ input? Data Select Enable All of the above Hint 9). When the enable input is zero, s1=0, S0=0 in the 1:4 demultiplexer then the outputs Y0, Y1, Y2, and Y3 are ________________ ? Y0=Y1=Y2=Y3=1 Y0=Y1=Y2=Y3=0 Y1=Y2=Y3=0, Y0=1 Y1=Y2=Y3=1, Y0=0 Hint 10). Which one of the following is a disadvantage of demultiplexer? Used as decoders Increases the communication system efficiency Wastage of bandwidth may occur All of the above Ans Hint 11). Which one of the following demultiplexers requires only one select line? 1-to-2 demux 1-to-4 demux 1-to-8 demux 1-to-16 demux Hint 12). Which one of the following is a type of combinational circuit? Demultiplexer Multiplexer Both a and b None of the above Hint 13). Which one of the following performs conversion from serial to parallel? Demultiplexer Multiplexer Both a and b None of the above Hint 14). Which one of the following is an operating principle for demultiplexer? One to many Many to one Both a and b None of the above Hint 15). How many 1 to 4 demux are used in the below block diagram? One Two Three Four Hint Demultiplexer MCQs for Interviews 16). In which one of the following logic circuits the feedback loop is not present? Sequential logic circuit Combinational logic circuit Both a and b None of the above Hint 17). In which one of the following logic circuits the combination of operands are not necessary? Sequential logic circuit Combinational logic circuit Both a and b None of the above Hint 18). The finite state machine is an example for _________________ circuit? Sequential logic circuit Combinational logic circuit Both a and b None of the above Hint 19). The encoder, multiplexers, decoder, demultiplexers are examples for __________________ logic circuit? Sequential logic circuit Combinational logic circuit Both a and b None of the above Hint 20). In which one of the following logic circuits the memory element is not present? Sequential logic circuit Combinational logic circuit Both a and b None of the above Hint 21). Which one of the following logic circuits generates output based on past output and present input? Sequential logic circuit Combinational logic circuit Both a and b None of the above Hint 22). Which one of the following is an example for demultiplexer? 16 input one output 8 inputs one output 1 input 16 outputs All of the above Hint 23). In which one of the following additional gates are included when designing? Demultiplexer Multiplexer Both a and b None of the above Hint 24). The function of integrated circuit i.e IC 74x154 is ________________ ? Quad 2:1 mux Quad 4:1 mux 1:16 demux None of the above Hint 25). The figure shown below is a _______________ demux circuit diagram? 1 to 4 1 to 8 1 to 16 None of the above Hint 26). Why do multiplexers behave as a data selector? N to one One to N Both a and b None of the above Hint 27). The figure shown below is a block diagram of _______________ demultiplexer? 1 to 4 1 to 8 1 to 16 None of the above Hint 28). Which one of the following IC provides multiplexing? IC 74x159 C 74x156 IC 74x157 None of the above Hint 29). The function of integrated circuit i.e IC 74x156 is ________________ ? Quad 2:1 mux Dual 1:4 demux 1:16 demux None of the above Hint 30). Which one of the following is known as a data selector? Demultiplexer Decoder Multiplexer All of the above Hint Demultiplexer MCQs for Quiz 31). Which one of the following demultiplexers requires only two select lines? 1-to-2 demux 1-to-4 demux 1-to-8 demux 1-to-16 demux Hint 32). The one input eight outputs is an example for ________________ ? Demultiplexer Multiplexer Both a and b None of the above Hint 33). The function of integrated circuit i.e IC 74x157 is ________________ ? Quad 2:1 mux Quad 4:1 mux Dual 2:1 mux None of the above Hint 34). The function of integrated circuit i.e IC 74x139 is ________________ ? Quad 2:1 mux Quad 4:1 mux Dual 1:4 demux None of the above Hint 35). The figure shown below is a _______________ demux block diagram? 1 to 4 1 to 8 1 to 16 None of the above Hint 36). Which one of the following is a demultiplexer IC? IC 74155 IC 74154 Both a and b None of the above Hint 37). The figure shown below is a _______________ demux circuit diagram? 1 to 4 1 to 8 1 to 16 None of the above Hint 38). Which one of the following is an example for multiplexer? 16 input one output 8 inputs one output 1 input 16 outputs Both a and b Hint 39). Which one of the following demultiplexers requires only five select lines? 1-to-2 demux 1-to-4 demux 1-to-8 demux 1-to-32 demux Hint 40). Which one of the following is also known as a data selector and many to one circuit? Demultiplexer Multiplexer Both a and b None of the above Hint Demultiplexer MCQs for Exams 41). When the enable input is one, s1=0, S0=1 in the 1:4 demultiplexer then the outputs Y0, Y1, Y2, and Y3 are ________________ ? Y0=Y1=Y2=Y3=1 Y0=Y1=Y2=Y3=0 Y1=Y2=Y3=0, Y0=1 Y1=Y2=Y3=1, Y0=0 Hint 42). How many 1 to 4 demux are used in the below block diagram? One Two Three Four Hint 43). Which one of the following is an advantage of demultiplexer? Used as decoders Increases the communication system efficiency Wastage of bandwidth may occur Both a and b Hint 44). Which one of the following demultiplexers requires only three select lines? 1-to-2 demux 1-to-4 demux 1-to-8 demux 1-to-16 demux Hint 45). When the enable input is one, s1=1, S0=0 in the 1:4 demultiplexer then the outputs Y0, Y1, Y2, and Y3 are ________________ ? Y0=Y1=Y2=Y3=1 Y0=Y1=Y2=Y3=0 Y0=Y1=Y3=0, Y2=1 Y1=Y2=Y3=1, Y0=0 Hint 46). The eight input one output is an example for ________________ ? Demultiplexer Multiplexer Both a and b None of the above Hint 47). Which one of the following performs conversion from parallel to serial? Demultiplexer Multiplexer Both a and b None of the above Hint 48). Which one of the following is an operating principle for multiplexer? One to many Many to one Both a and b None of the above Hint 49). Which one of the following demultiplexers requires only four select lines? 1-to-2 demux 1-to-4 demux 1-to-8 demux 1-to-16 demux Hint 50). When the enable input is one, s1=s0=1 in the 1:4 demultiplexer then the outputs Y0, Y1, Y2, and Y3 are ________________ ? Y0=Y1=Y2=Y3=1 Y0=Y1=Y2=Y3=0 Y0=Y1=Y3=0, Y2=1 Y0=Y1=Y2=1, Y3=1 Hint Read more about Demultiplexer Please fill in the comment box below. Time is Up! Time's up
