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Digital Electronics

Digital Electronics
Which of the following is a self-complementing code?

 cyclic code
 Gray code
 XS-3 code
 Hamming code

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Digital Electronics
Which one of the following even parity codes are in errors. (I)100110010 (II)011101010 (III)10111111010001010

 Both (II)&(III)
 Both (I)&(III)
 Only (III)
 Only (II)

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Digital Electronics
Digital computers are more widely used as compared to analog computers, because they are

Useful over wider ranges of problem types
Always more accurate and faster
Easier to maintain
Less expensive

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Digital Electronics
A computer has a word length of 8 bits (including sign). It is required to determine the range of integers that can be stored in the computer. If 2’s complement is used to represent the numbers, then the range will be

 -256 to 256
 -128 to 128
 -128 to 127
 -256 to 255

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Digital Electronics
The voltage levels for positive logic system

 must necessarily be negative
 must necessarily be 0 V and 5 V
 may be positive or negative
 must necessarily be positive

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Digital Electronics
What is the logic which controls a stair case light associated with two switches A and B located at the bottom and top of the stair case respectively?

 OR
 AND
 X-NOR
 X-OR

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