Digital Electronics - ECE Questions and Answers

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Assertion (A): A demultiplexer cannot be used as a decoder

Reason (R): A multiplexer selects one of many outputs whereas a decoder selects on output corresponding to coded input.

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

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Hexadecimal number F is called to octal number

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A half adder can be used only for adding

1 s

2 s

4 s

8 s

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In the 8421 BCD code, the decimal number 125, is written as

1111101

0001 0010 0101

7 D

none of these

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110.11₂ x 110₂ = __________ ₁₀

40.5

30.5

20.5

10.5

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Y = A + A B is the same as

Y = AB

Y = A + B

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Assertion (A): Different symbols are used for different gates

Reason (R): IEEE symbols are the same as traditional symbols for gates.

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