The number of distinct Boolean expression of 4 variables is 16 256 1024 65536 22

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Question
The number of distinct Boolean expression of 4 variables is
Options
A. 16
B. 256
C. 1024
D. 65536

Correct Answer

65536

Explanation

2^2ⁿ = 2^2⁴ = 2¹⁶ .

Digital Electronics problems

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1. 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

3. 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

5. If duty cycle is a and the load is a resistance R, the rms value of output voltage is
Options
A. aV
B. a V
C. a²V
D.

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

8. 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

9. 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

10. 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

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