Msi Logic Circuits

How is the number one (1) indicated on the outputs of a 7447 BCD-to-seven-segment code converter?

A:

Segment a is active.

B:

Segment b is active.

C:

Segments a and b are active.

D:

Segments b and c are active.

Answer: D

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Output 5 of a 74138 octal decoder is selected when it is enabled by a data input of:

A:

B:

C:

D:

Answer: B

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A breadboard-circuit design using a BCD-to-decimal decoder has a problem wherein the operation of the system is erratic. The technician uses his scope to examine the waveforms throughout the system and doesn't really see any problems. While he's scratching his head, what helpful advice can you offer him as to what might be wrong and what to do to correct the problem?

A:

The decoder is thermally intermittent; replace it.

B:

There is probably a bad connection on the wire wrap protoboard; recheck the wiring.

C:

Glitches are probably the culprit; strobe the decoder.

D:

The decoder is thermally intermittent and must be replaced; or there is probably a bad connection on the wire wrap protoboard, and the wiring must be rechecked.

Answer: C

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A 16-input multiplexer is to be used to perform parallel-to-serial data conversion. Which of the following counters would be required to provide the data select inputs?

A:

MOD 8

B:

MOD 16

C:

MOD 4

D:

MOD 2

Answer: B

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The BCD/DEC decoder shown in figure (a) is examined with a logic analyzer and the results are shown in the waveforms in figure (b). What, if anything, is wrong with the circuit?

A:

The "2" output is shorted to V_cc.

B:

The A1 input is internally open.

C:

The A1 input node is internally stuck LOW.

D:

Nothing is wrong with the circuit.

Answer: C

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Questions for: Msi Logic Circuits