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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
Counter is a

  combinational circuit.
  none.
  sequential circuit.
  both.

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

 none of these
 OR
 NOR
 NAND

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Digital Electronics
Assuming 8 bits for data, 1 bit for parity, I start bit and 2 stop bits, the number of characters that 1200 BPS communication line can transmit is.

None of these
10 CPS
120 CPS
12 CPS

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Digital Electronics
An 8 × 4 ROM contains a decoder of size

 3 × 8
 3 × 4
 8 × 8
 8 × 4

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

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