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Digital Electronics

Digital Electronics
A combinational circuit can be designed using only

 OR gates
 AND gates
 OR and X-NOR gates
 NOR gates

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Digital Electronics
An OR gate has 6 inputs. The number of input words in its truth table are

64
32
6
128

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Digital Electronics
X = 01110 and Y = 11001 are two 5-bit binary numbers represented in 2’s complement format. The sum of X and Y in 2’s complement format using 6 bits is

 101001
 0001111
 100111
 001000

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Digital Electronics
An X-OR gate gives a high output

 for odd decimal value.
 if it has even number of 0s
 if there are odd number of 1s
 if the decimal value of digital word is even

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Digital Electronics
The following code is not a BCD code.

 8421 code
 XS-3 code
 Gray code
 all of these

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Digital Electronics
Which one of the following is an invalid state in 8-4-2-1 binary coded decimal counter

 1100
 1001
 0011
 1000

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