# Electronics and Communication Engineering - Digital Electronics

46.

The number of flip-flops required to build a mod-19 counter is

 A. 4 B. 5 C. 6 D. 7

Explanation:

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47.

The number of flip-flops needed to divide the input frequency by 32 is

 A. 2 B. 4 C. 5 D. 16

Explanation:

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48.

Given two numbers A and B in sign magnitude representation in an eight bit format A = 00011110 and B = 10011100 then A ⊕ B gives

 A. 10000010 B. 00011111 C. 10011101 D. 11100001

Explanation:

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49.

The 8086 arithmetic instruction work on

1. signed and unsigned numbers
2. ASCII data
3. unpacked BCD data
Select the correct answer using the codes given below :

 A. 1 and 2 B. 1 and 3 C. 2 and 3 D. 1, 2 and 3

Explanation:

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50.

For the K map of the given figure the simplified Boolean expression is

 A. A + BC B. A + BC C. A + B C D. A + B C