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Digital Electronics

Digital Electronics
The number of 1 in 8-bit representation of 127 in 2’s complement form is m and that in 1,s complement form is n. What is the value of m:n?

 1:1
 1:2
 2:1
 2:3

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Digital Electronics
Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is

ECL
TTLAS
CMOS
TTLLS

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Digital Electronics
11001, 1001 and 111001 correspond to the 2’scomplement representation of the following set of numbers

 -7, -7 and -7 respectively
 25, 9 and 57 respectively
 -6, -6 and -6 respectively
 -25, -9 and -57 respectively

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Digital Electronics
Which of the logical operations is represented by the + sign in Boolean algebra ?

 AND
 NOT
 OR
 NAND

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Digital Electronics
Which of the following gate is a two-level logic gate

EXCLUSIVE OR gate
NOT gate
NAND gate
OR gate

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Digital Electronics
A bubbled NAND gate is equivalent to a

 X-OR gate
 NOR gate
 OR gate
 NAND gate

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