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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?

 four
 three
 one
 two

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Digital Electronics
The number of 1 in 8-bit representation of 127 in 2’s complement form is m and that in 1,s complement form is n. What is the value of m:n?

 1:2
 2:1
 2:3
 1:1

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Digital Electronics
A device which converts BCD into octal is called

 encoder
 decoder
 demultiplexer
 code converter

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Digital Electronics
In a T flip-flop no of input circuit is

 3
 4
 1
 2

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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
12 CPS
120 CPS
10 CPS

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Digital Electronics
A 10 bit A/D conveter is used to digitize an analog signal in the 0 to 6 volt. The maximum peak to ripple voltage that can be allowed in the D.C. supply voltage is

 5 mV.
 10 mV.
  6 mV.
  5.85 mV.

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