Flip Flops – 1 – 1

1. A latch has _____ stable states.

(a) One
(b) Two
(c) Three
(d) Four

ANSWER

EXPLANATION

2. An S-R latch can be implemented by using _______ gates.

(a) AND, OR
(b) NAND, NOR
(c) NAND, XOR
(d) NOT, XOR

ANSWER

EXPLANATION

3. If an active-HIGH S-R latch has a 0 on the S input and a 1 on the R input and then the R input goes to 0, the latch will be ________.

(a) SET
(b) RESET
(c) Clear
(d) Invalid

ANSWER

EXPLANATION

4. 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) Clear
(d) Invalid

ANSWER

EXPLANATION

5. Gated S-R latch is a combination of which latch and gate ?

(a) J-K latch and NOR gate
(b) S-R latch and NAND gate
(c) S-R latch and NOR gate
(d) J-K latch and NAND gate

ANSWER

EXPLANATION

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