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Digital Electronics

Digital Electronics
Which of the following is known as a mod-2 adder?

 NOR gate
 X-NOR gate
 X-OR gate
 NAND gate

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Digital Electronics
If two numbers in excess-3 code are added and the result is less than 9, then to get equivalent binary

 0011 is added
 0110 is added
 0011 is subtracted
 0110 is subtracted

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Digital Electronics
2's Complement of 10101011 is

 00111100
 10101100
 10101011
 01010101

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

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

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Digital Electronics
The NAND gate can function as a NOT gate if

 one input is set to 0
 inputs are left open
 one input is set to 1
 all inputs are connected together

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Digital Electronics
Which number system has a base of 16

 Hexadecimal
 Octal
 Decimal
 None

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