MSI Logic Circuits - General Questions (3)

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MSI Logic Circuits - General Questions

17.

The IEEE/ANSI symbol for a decoder has the internal designation bcd/dec. This means the decoder is a:

A.	decimal-to-BCD decoder with ten inputs and four outputs.
B.	BCD-to-decimal decoder with ten inputs and four outputs.
C.	decimal-to-BCD decoder with four inputs and ten outputs.
D.	BCD-to-decimal decoder with four inputs and ten outputs.

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

18.

The data transmission system shown in below has a problem; the parity error output is always high. A logic analyzer is used to examine the system and shows that the DATA IN on the left matches the DATA OUT on right. What might be causing the problem?

mcq9_1017_1

A.	The error gate could be defective.
B.	The storage circuit could be defective.
C.	The parity checker could be bad.
D.	Any of the above.

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

19.

Which statement best describes the given figure, and what is the function of the terminal labeled EN?

mcq9_1009_2

A.	Quad two-input multiplexer. EN is the enable input, which requires an active LOW for the device to work.
B.	Quad two-bit multiplier, EN is the active HIGH trigger.
C.	Dual quad-input multiplexer, which requires an active LOW on the EN terminal for the device to work.
D.	Quad two-input AND gate, which requires an active LOW on the EN input to enable all the gates.

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

20.

It is suspected that the comparator in the figure given below has a problem. The inputs are activated in the table shown below and the corresponding outputs noted. What is most likely wrong with the circuit?
For P0 – P3 = 1 and Q0 – Q3 = 0, P > Q = 1, P = Q = 1, P < Q = 0
For P0 – P3 = 0 and Q0 – Q3 = 1, P > Q = 0, P = Q = 1, P < Q = 1
For P0 – P3 = 1 and Q0 – Q3 = 1, P > Q = 0, P = Q = 1, P < Q = 0

mcq9_1016_1

A.	The P0–P3 inputs are defective.
B.	One or more of the Q inputs is bad.
C.	The P = Q output is shorted to Vcc.
D.	Nothing is wrong; the circuit is functioning properly.

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

21.

For the input values (A0–A3, B0–B3, Data Select = 1) given for the circuit given below, what will be indicated on the displays?

mcq9_1022_1

A.	A = 0, B = 5
B.	A = 5, B = 0
C.	A = 6, B = 0
D.	A = 0, B = 6

Answer: Option D

Explanation:

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22.

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: Option D

Explanation:

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23.

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

A.
B.
C.
D.

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

24.

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: Option C

Explanation:

No answer description available for this question. Let us discuss.

MSI Logic Circuits - General Questions (3)

MSI Logic Circuits - General Questions

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