Question

Answers are at the end of the chapter 1. If an S-R latch has a 1 on the S input and a 0 on the R input and then the S input goes to 0, the latch will be (a) set (b) reset (c) invalid (d) clear 2. The invalid state of an S-R latch occurs when (c) S 1,R-1 (d) S-0, R-O 3. For a gated D latch, the output always equals the D input (a) before the enable pulse (b) during the enable pulse (c) immediately after the enable pulse (d) answers (b) and (e) 4. Like the latch, the flip-flop belongs to a category of logic circuits known as (a) monostable multivibrators (b) bistable multivibrators (c) astable multivibrators (d) one-shots 5. The purpose of the clock input to a flip-flop is to (a) clear the device (b) set the device (c) always cause the output to change states (d) cause the output to assume a state dependent on the controlling (J-K or D) inputs. 6. For an edge-triggered D flip-flop, (a) a change in the state of the flip-flop can occur only at a clock pulse edge (b) the state that the flip-flop goes to depends on the D input (e) the output follows the input at each clock pulse (d) all of these answers 7. A feature that distinguishes the J-K flip-flop from the D flip-flop is the (a) toggle condition (c) type of clock (b) preset input (d) clear input 8. A flip-flop is in the toggle condition when (b) J-1,K-1 (a) J-1,K-0 9. A J-K flip-flop withJ 1 and K 1 has a 10 kHz clock input. The Q output is (a) constantly HIGH (c) a 10 kHz square wave (b) constantly LOW (d) a 5 kHz square wave 10. A one-shot is a type of (a) monostable multivibrator (c) timer (e) answers (b) and (c) (b) astable multivibrator (d) answers (a) and (c)

Answer 1