The access time of a word in 4 MB main memory is 100 ms. The access time of a wo

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Question
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

Correct Answer

14.5 ns

Explanation

Access time = 0.95 x 10 + 0.05 x 100.

Digital Electronics problems

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1. 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

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

5. 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

6. 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

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

8. A device which converts BCD to seven segment is called
Options
A. encoder
B. decoder
C. multiplexer
D. none of these

9. A 12 bit ADC is used to convert analog voltage of 0 to 10 V into digital. The resolution is
Options
A. 2.44 mV
B. 24.4 mV
C. 1.2 V
D. none of the above

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