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Digital Electronics

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

 4
 7
 15
 16

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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?

 2:3
 1:1
 2:1
 1:2

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Digital Electronics
Which of the following is known as a mod-2 adder?

 X-NOR gate
 NOR gate
 X-OR gate
 NAND gate

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Digital Electronics
Which of the following represents (E3)16 ?

 (1CE)16+(A2)16
 (200)16-(11D)16
 (1BC)16-(DE)16
 (2BC)16-(1DE)16

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Digital Electronics
In the toggle mode a JK flip-flop has

 J = 0, K = 1.
 J = 1, K = 0.
 J = 0, K = 0.
 J = 1, K = 1.

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Digital Electronics
A half adder has

 2 inputs and 2 output
 2 inputs and 1 outputs
 1 input and 1 output
 1 input and 2 outputs

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