Digital Circuits

Encoders and Decoders

21 questions By Tony R. Kuphaldt

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Question 4 of 21

Identify which diode is failed in this circuit, given the following truth table (showing the actual operation of the encoder circuit, not what it should do):


Switch position	Output code

0	`000`

1	`001`

2	`010`

3	`011`

4	`100`

5	`001`

6	`110`

7	`111`

Be sure to specify whether you think the failed diode is open or shorted.

Reveal answer

Question 5 of 21

Identify which diode is failed in this circuit, given the following truth table (showing the actual operation of the encoder circuit, not what it should do):


Switch position	Output code

0	`000`

1	`111`

2	`010`

3	`111`

4	`100`

5	`111`

6	`110`

7	`111`

Be sure to specify whether you think the failed diode is open or shorted.

Reveal answer

Question 6 of 21

Identify which diode is failed in this circuit, given the following truth table (showing the actual operation of the encoder circuit, not what it should do):


Switch position	Output code

0	`000`

1	`001`

2	`110`

3	`111`

4	`100`

5	`101`

6	`110`

7	`111`

Be sure to specify whether you think the failed diode is open or shorted.

Reveal answer

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