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Digital Electronics

Digital Electronics
(11011) 2 in BCD 8421 code is

 11011001
 00100111
 01101100
 00011011

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Digital Electronics
Which of the following operations is commutative but not associative?

 AND
 NAND
 OR
 X-OR

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Digital Electronics
Which of the following codes is known as the 8421 code?

 ASCII code
 BCD code
 XS-3 code
 Gray code

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Digital Electronics
The fan put of a 7400 NAND gate is

10TTL
5TTL
2TTL
8TTL

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Digital Electronics
The output of a logic gate is 0 when all its inputs are at logic 1. The gate is either

 a NOR or an X-NOR
 a NAND or an X-OR
 a NAND or an AND
 a NAND or an X-NOR

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Digital Electronics
What is the minimum number of 2 input NAND gates used to perform the function of 2 input OR gate

 4
 1
 3
 2

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