 191. In an SR latch made by cross coupling two NAND gates, If both S and R inputs are set to 0, then it will result in a. q = 0, q’ = 1 b. q = 1, q’ = 0 c. q = 1, q’ = 1 d. Indeterminate states
 Answer: (c).q = 1, q’ = 1

 192. The purpose of latch feedback is? a. Increase speed b. Improve performance c. Uneven propagation d. All the above

 193. The minimum number of D flip – flops needed to design a mod – 258 counter is a. 9 b. 8 c. 512 d. 258

 194. A 10 – bit Asynchronous counter is having initial value 0 1 0 0 0 1 1 1 1 1. How many flip flops are complemented at next clock? a. 1 b. 5 c. 6 d. 7

 195. A sequential circuit is having one input and 2 states; The clock is initially in state A. It remains in the same state as long as (x=0) (i.e., input =0). If the input is 1, it switches to the state B and remains there as long as input is 0. On receiving 1 it switches back to state A. If it is realized with D – FF. what is the expression for D FF? a. XQ + XQ’ b. X’Q’ + XQ c. X’Q + XQ’ d. X’Q + X’Q’

 196. How many 3 – to – 8 line decoders with an enable input are needed to construct a 6 – to – 64 line decoder without using any other logic gates? a. 7 b. 8 c. 9 d. 10

 197. Let the 3 variable function f (a, b, c) = Σ (0, 1, 4, 5,7) is realized with 4x1 mux. The select line S₁ & S₀ are connected with A, B. What will be the connections for data inputs? a. 1, 0, 1, C b. 1, 0, C, C c. 1, C, C, C d. 1, C, C, C