Electronics and Communication Engineering - Digital Electronics

21. 

Which of the following can provide a digital signal?

A. Slow change in the value of a resister
B. Sine wave
C. Square wave
D. Gradual turning of a potentiometer

Answer: Option C

Explanation:

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22. 

If all bubbles are removed, what are the new RAM locations?
The 8156 of a figure has RAM locations from 2000 H to 20 FFH.

A. (8000)H - (83FF)H
B. (80AA)H - (80FF)H
C. (FF00)H - (FFFF)H
D. none of the above

Answer: Option C

Explanation:

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23. 

Data are recorded on a 2, 400 ft reel of magnetic tape at a density of 556 characters per inch. If the record length is of 100 characters and 0.75 inch of record gap, the tape utilization factor is

A. 0.85
B. 0.67
C. 0.19
D. 0.08

Answer: Option C

Explanation:

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24. 

Some of MOS families are PMOS, CMOS, the family dominating the LSI field, where low power consumption is necessary is

A. NMOS
B. CMOS
C. PMOS
D. both NMOS, CMOS

Answer: Option B

Explanation:

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25. 

For a particular type of memory the access time and cycle time are 200 ns each. The maximum rate at which data can be accessed by

A. 2.5 x 106/s
B. 5 x 106/s
C. 0.2 x l06/s
D. 106/s

Answer: Option A

Explanation:

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