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Digital Electronics

Digital Electronics
The binary number 10101 is equivalent to decimal number ___________.

19
27
21
12

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

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Digital Electronics
A NAND gate is called a universal logic element because

It is used by everybody
Any logic function can be realized by NAND gates alone
All the minization techniques are applicable for optimum NAND gate realization
Many digital computers use NAND gates.

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Digital Electronics
The maximum positive and negative numbers which can be represented in two’s complement form using n bits are respectively,

 +2n-1,-(2n-1+1)
 +2n-1,-2n-1
 +(2n-1-1),-2n-1
 +(2n-1-1),-(2n-1-1)

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Digital Electronics
Which logic family provide minimum power dissipation

 CMOS
 JFET
 TTL
 ECL

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Digital Electronics
Minimization of logical expressions while designing digital systems helps in reducing

 space requirements
 power requirements
All of these
 cost

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