Questions and answers for exam Preparation

MCQs

Total Questions : 41 | Page 1 of 5 pages

Question 1. Which statement below best describes the function of a decoder?

A decoder will convert a decimal number into the proper binary equivalent.
A decoder will convert a binary number into a specific output representing a particular character or digit.
Decoders are used to prevent improper operation of digital systems.
Decoders are special ICs that are used to make it possible for one brand of computer to talk to another.

Discuss Question

Answer: Option B. -> A decoder will convert a binary number into a specific output representing a particular character or digit.

Question 2. How is the number one (1) indicated on the outputs of a 7447 BCD-to-seven-segment code converter?

Segment a is active.
Segment b is active.
Segments a and b are active.
Segments b and c are active.

Discuss Question

Answer: Option D. -> Segments b and c are active.

Question 3. 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.

Discuss Question

Answer: Option C. -> moving data over long distance transmission lines.

Question 4.
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?

The decoder is thermally intermittent; replace it.
There is probably a bad connection on the wire wrap protoboard; recheck the wiring.
Glitches are probably the culprit; strobe the decoder.
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.

Discuss Question

Answer: Option C. -> Glitches are probably the culprit; strobe the decoder.

Question 5. 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?