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Digital Electronics problems

1. An 8 bit DAC has a full scale output of 2 mA and full scale error of � 0.5%. If input is 10000000 the range of outputs is
Options
A. 994 to 1014 ?A
B. 990 to 1020 ?A
C. 800 to 1200 ?A
D. none of the above

3. For the K map in the given figure the simplified Boolean expression is
Options
A. A C + A D + ABC
B. A C + A D + ABC
C. A C + A D + ACD
D. A C + A D + AB C

5. For the truth table of the given figure Y =
Options
A. A + B + C
B. A + BC
C. A
D. B

7. If the functions w, x, y, z are as follows.
w = R + PQ + RS ,
x = PQR S + PQR S + PQ R S

Then
Options
A. w = z x = z
B. w = z, x = y
C. w = y
D. w = y = z

8. The access time of a word in 4 MB main memory is 100 ms. The access time of a word in a 32 kb data cache memory is 10 ns. The average data cache bit ratio is 0.95. The efficiency of memory access time is
Options
A. 9.5 ns
B. 14.5 ns
C. 20 ns
D. 95 ns

9. An OR gate has 4 inputs. One input is high and the other three are low. The output
Options
A. is low
B. is high
C. is alternately high and low
D. may be high or low depending on relative magnitude of inputs

10. Which of the following is non-saturating?
Options
A. TTL
B. CMOS
C. ECL
D. Both (a) and (b)

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