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Electronics and Communication Engineering - Digital Electronics

Exercise : Digital Electronics - Section 1
26.
A 12 bit ADC is used to convert analog voltage of 0 to 10 V into digital. The resolution is
2.44 mV
24.4 mV
1.2 V
none of the above
Answer: Option
Explanation:

.

27.
For the truth table of the given figure Y =
A + B + C
A + BC
A
B
Answer: Option
Explanation:

Y = A B C + A B C + AB C + A B C = A B (C + C) + A B (C + C) = A B + AB = B(A + A) = B.

28.
A full adder can be made out of
two half adders
two half adders and a OR gate
two half adders and a NOT gate
three half adders
Answer: Option
Explanation:

29.
If the functions w, x, y, z are as follows.
w = R + PQ + RS ,
x = PQR S + PQR S + PQ R S


Then
w = z x = z
w = z, x = y
w = y
w = y = z
Answer: Option
Explanation:

Use k-map, then it will be easy.

30.
The output of a half adder is
SUM
CARRY
SUM and CARRY
none of the above
Answer: Option
Explanation:

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