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Digital Electronics

Digital Electronics
Which one of the following is 2’s complement of -68?

 11000100
 00111100
 10111100
 01111100

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Digital Electronics
A full adder has

 2 inputs, 2 outputs
 3 inputs, 2 outputs
 3 inputs, 1 output
 2 inputs, 1 output

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Digital Electronics
Extremely low power dissipation per gate can be gained from

 ECL ICs
 TTL ICs
 MOS ICs
 CMOS ICs

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Digital Electronics
A D-flip-flop is said to be transparent when

 the output follow input
 the output is HIGH
 the output is LOW
 the output follows clock

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

 Hamming code
 XS-3 code
 8421 code
 Gray code

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Digital Electronics
The voltages corresponding to LOW and HIGH levels respectively are given below. Identify the voltages which correspond to positive logic system.

 0 V and 5 V
 –1.5 V and – 5 V
 5 V and 0 V
 1 V and -5 V

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