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Digital Electronics

Digital Electronics
What is the Boolean expression for a two-input AND gate ?

 A & B
 A + B
 A - B
 A.B

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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

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

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Digital Electronics
Which of the following gates cannot be used as an inverter?

 X-NOR
 AND
 NAND
 NOR

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Digital Electronics
The number of rows in the truth table of a 4-input gate is

 4
 8
 12
 16

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Digital Electronics
The output of a logic gate is 1 when all its inputs are at logic 1. The gate is either

 an AND or a NOR
 an AND or an OR
 an OR or an X-OR
 a NAND or a NOR

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Digital Electronics
A digital voltmeter has a read out range from 0 to 999 counts, the resolution is

 1 V.
 0.01 V.
 1.1 V.
  1 mV.

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