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Digital Electronics

Digital Electronics
What logic function is produced by adding an inverter to each input and output of an AND gate?

 NOR
 NAND
 OR
 X-OR

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Digital Electronics
Consider the following multiplication: (10w1z) × (15)10 = (y01011001)2 Which one of the following gives appropriate values of w,y and z?

 w = 0,y = 0,z = 1
 w = 1,y = 1,z = 1
 w = 1,y = 1,z = 0
 w = 0,y = 1,z = 1

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Digital Electronics
Which one of the following is not a vectored interrupt?

 TRAP.
 RST 6.5.
 INTR.
 RST 7.5.

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Digital Electronics
The Quine– McClusky method of minimization of a logic expression is a (i) graphical method (ii) algebraic method (iii) tabular method (iv) a computer-oriented algorithm The correct answers are

 (i) and (iii)
 (ii) and (iv)
 (i) and (ii)
 (iii) and (iv)

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Digital Electronics
A gate is enabled when its enable input is at logic 0. The gate is

 NOR
 none of these
 AND
 NAND

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Digital Electronics
ASCII and EBCDIC codes are

 BCD codes
 numeric codes
 alphanumeric codes
 error correcting codes

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