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Digital Electronics - MSI Logic Circuits

Exercise : MSI Logic Circuits - General Questions
11.

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

The P0–P3 inputs are defective.
One or more of the Q inputs is bad.
The P = Q output is shorted to Vcc.
Nothing is wrong; the circuit is functioning properly.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.

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

Quad two-input multiplexer. EN is the enable input, which requires an active LOW for the device to work.
Quad two-bit multiplier, EN is the active HIGH trigger.
Dual quad-input multiplexer, which requires an active LOW on the EN terminal for the device to work.
Quad two-input AND gate, which requires an active LOW on the EN input to enable all the gates.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.

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?

The error gate could be defective.
The storage circuit could be defective.
The parity checker could be bad.
Any of the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
The IEEE/ANSI symbol for a decoder has the internal designation bcd/dec. This means the decoder is a:
decimal-to-BCD decoder with ten inputs and four outputs.
BCD-to-decimal decoder with ten inputs and four outputs.
decimal-to-BCD decoder with four inputs and ten outputs.
BCD-to-decimal decoder with four inputs and ten outputs.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
Multiplexing of digital signals is usually required when:
moving data internally within a microprocessor.
moving data between memory and storage registers in a microprocessor.
moving data over long distance transmission lines.
moving data internally within a microprocessor or between memory and storage registers.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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