### 9. Shift registers are used to store and transfer data.

### 10. A J-K flip-flop excitation table lists the present state, the next state, and the J and K levels required to produce each transition.

### 1. Counters are generally decoded in order to determine their count state.

### 2. Phototransistors have varying resistance from collector to emitter, depending on how much light strikes them.

### 3. An asynchronous counter differs from a synchronous counter in the method of clocking.

### 4. When a J-K flip-flop is used in a circuit, we only have to consider the level at J and K at the active clock edge to know the states of the outputs.

### 5. The MOD number of a Johnson counter will always be equal to one-half the number of flip-flops in the counter.

### 6. In a synchronous counter, each state is clocked by the same pulse.

### 7. To design a divide-by-200 counter using synchronous counters, two 4-bit counters could be cascaded together to form an 8-bit counter.

### 8. Another term used to describe up/down counters is bidirectional .

### 9. A state diagram is a table of states.

### 10. All flip-flops in an asynchronous counter change states at the same time.

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