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Digital Electronics

Digital Electronics
Maximum number in decimal that can be represented by 4 bits (binary) is

 4
 15
 7
 16

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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
Counter is a

  combinational circuit.
  none.
  both.
  sequential circuit.

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Digital Electronics
A gate is enabled when its enable input is at logic 1. The gate is

 OR
 NOR
 NAND
 none of these

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Digital Electronics
A switch-tail ring counter is made by using a single D-FF, the following circuit is

  J-K FF.
  D FF.
  S-R FF.
  T FF.

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Digital Electronics
What is/are the configurable functions of each and every IOBs connected around the FPGA device from the operational point of view?

Bi-directional I/O pin access
Tristate output operation
Input operation
All of these

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