Digital Electronics

Exercise: Digital Electronics

Assertion (A): A demultiplexer can be used as a decoder.

Reason (R): A demultiplexer can be built by using AND gates only.

Both A and R are correct and R is correct explanation of A

Both A and R are correct but R is not correct explanation of A

A is true, R is false

A is false, R is true

Answer: C

Demultiplexer requires NOT gates also in addition to AND gates.

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1's complement of 11100110 is

00011001

10000001

00011010

00000000

Answer: A

Replace 1 by 0 and 0 by 1.

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Maxterm designation for A + B + C is

M₀

M₁

M₃

M₄

Answer: A

A + B + C = 000 = M₀ .

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A three state switch has three outputs. These are

low, low and high

low, high, high

low. floating, low

low, high, floating

Answer: D

Third state is floating.

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In a BCD to 7 segment decoder the minimum and maximum number of outputs active at any time is

2 and 7

3 and 7

1 and 6

3 and 6

Answer: A

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

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