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Digital Electronics

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

 01111100
 00111100
 11000100
 10111100

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Digital Electronics
A half adder has

 1 input and 1 output
 2 inputs and 1 outputs
 1 input and 2 outputs
 2 inputs and 2 output

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Digital Electronics
Each term in the standard POS form is called a

 minterm
 don’t care
 literal
 maxterm

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Digital Electronics
The parity of the binary number 11011001 is

 not known
 same as the number of zeros
 even
 odd

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Digital Electronics
Which of these sets of logic gates are designated as universal gates?

 OR, NOT, AND.
 NOR, NAND.
 NOR, NAND, XNOR.
 XOR, NOR, NAND.

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Digital Electronics
Why small bubble is given on the output of the NAND gate symbol ?

 Open collector output
 Output is inverted
 Tristate
None of these

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