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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?

 2:1
 1:2
 1:1
 2:3

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Digital Electronics
NOT gates are to be added to the inputs of which gate to convert it to a NAND gate?

 AND
 X-OR
 OR
 NOT

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Digital Electronics
In which code do the successive code characters differ in only one position?

 8421 code
 Gray code
 XS-3 code
 Hamming code

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Digital Electronics
An AND gate can be imagined as

 transistors connected in paralle
 switches connected in series
 switches connected in parallel
 transistors connected in series

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Digital Electronics
(44)8 in BCD 8421 code is

 00100100
 00110110
 01000100
 01100011

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Digital Electronics
The number 10000 would appear just immediately after

FFFF (hex)
7777 (octal)
All of these
1111 (binary)

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