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Digital Electronics

Digital Electronics
What is the minimum number of two-input NAND gates used to perform the function of 2-input OR gate?

 one
 three
 four
 two

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Digital Electronics
The simplified block diagram of a 10-bit A/D converter of dual slope integrator type is shown in figure. The 10-bit counter at the output is clocked by a 1 Mhz clock. Assuming negligible timing overhead for the control logic, the maximum frequency of the analog signal that can be converted using this A/D converted is approximately .

 500 Hz.
 250 Hz.
 2 KHz.
  1 KHz.

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Digital Electronics
If 4 input MUXes drive a 4 input multiplexer, it results a

 6 input MUX
 4 input MUX
 8 input MUX
 16 input MUX

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Digital Electronics
The time required for a gate to change its output is called as

 start time
 propagation time
 Decay time
 run time

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Digital Electronics
What is the requirement of fullsubstractor circuit ?

 Three inputs and two outputs
 Two inputs and three outputs
 Two inputs and two outputs
 Three inputs and one output

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Digital Electronics
The output of a NAND gate is low

 only when at least one input is high
 only when all the inputs are low
 only when all the inputs are high
 only when at least one input is low

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