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Electronics and Communication Engineering - Digital Electronics

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Exercise :: Digital Electronics - Section 1

46. 

AB + AB =
A. B
B. A
C. 1
D. 0

Answer: Option B

Explanation:

AB + AB = A(B + B) = A . 1 = A.

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47. 

In a BCD to 7 segment decoder the minimum and maximum number of outputs active at any time is
A. 2 and 7
B. 3 and 7
C. 1 and 6
D. 3 and 6

Answer: Option A

Explanation:

Minimum number of outputs when input is decimal 1 and maximum number of outputs when input is decimal 8.

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48. 

A three state switch has three outputs. These are
A. low, low and high
B. low, high, high
C. low. floating, low
D. low, high, floating

Answer: Option D

Explanation:

Third state is floating.

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49. 

Maxterm designation for A + B + C is
A. M0
B. M1
C. M3
D. M4

Answer: Option A

Explanation:

A + B + C = 000 = M0 .

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50. 

1's complement of 11100110 is
A. 00011001
B. 10000001
C. 00011010
D. 00000000

Answer: Option A

Explanation:

Replace 1 by 0 and 0 by 1.

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