Digital Electronics - Code Converters and Multiplexers

Exercise :: Code Converters and Multiplexers - General Questions

11. 

A principle regarding most IC decoders is that when the correct input is present, the related output will switch:

A. active-HIGH
B. to a high impedance
C. to an open
D. active-LOW

Answer: Option D

Explanation:

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12. 

What control signals may be necessary to operate a 1-line-to-16 line decoder?

A. flasher circuit control signal
B. a LOW on all gate enable inputs
C. input from a hexadecimal counter
D. a HIGH on all gate enable circuits

Answer: Option B

Explanation:

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13. 

One multiplexer can take the place of:

A. several SSI logic gates
B. combinational logic circuits
C. several Ex-NOR gates
D. several SSI logic gates or combinational logic circuits

Answer: Option D

Explanation:

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14. 

How many exclusive-NOR gates would be required for an 8-bit comparator circuit?

A. 4
B. 6
C. 8
D. 10

Answer: Option C

Explanation:

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15. 

How many inputs are required for a 1-of-10 BCD decoder?

A. 4
B. 8
C. 10
D. 1

Answer: Option A

Explanation:

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