digital logic

D P 4. The following table shows a 4-to-2 priority encoder with inputs A, B, C, D and outputs P and Q. 'X' represents don't care value. The simplified SOP expressions for P(A,B,C,D) and Q(A,B,C,D) are: A B A. P=D'+ BC; Q=D+B' 0 B. PED+B C; Q=D+B C. PED+B'C'; Q=D'+B D. P=D'+B'C; Q=D+B E. None of the above X 0 0 x X X 1 1 1 O XOO X 0 0 1 1 0 1 0 1 0 0 0 0 5. The circuit below shows a 1:4 demultiplexer with input 0 and selection lines 10. What are the outputs? A. Yo= 0; Y= 0; Y2 = 0; Y3= 0) B. Yo = 1; Y1 = 0; Y2 = 0; Y3 = 0 C. Yo=0; Y1 = 1; Y2= 0; Y3 = 0 D. Yo= 0; Y1 = 0; Y2= 1; Y3 = 0 E. Yo= 0; Y= 0; Y2= 0; Y3 = 1 0 1:4 Yc DEMUX Y S Y So yut 1 0 6. A Boolean function Z(A,B,C) is implemented using a 4:1 multiplexer as shown below. What is Z? A. Z(A,B,C) = 2 m(1,4,5,6) B B. Z(A,B,C) = m(2,3,4,6) C. Z(A,B,C) = m(0,2,5, 6) D. Z(A,B,C)= 2 m(2, 4, 6, 7) E. ZA,B,C) = m(2, 4, 5, 6) 0 0 4:1 I MUX Z AC