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Digital Electronics

Digital Electronics
Which of the following is not a transmission medium?

 Coaxial cables.
  Modem.
 Telephone lines.
 Microwave systems.

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Digital Electronics
Which circuit is used in between two systems having two different codes

 Conversion
 Sequential
 Combinational
 Both A and B

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Digital Electronics
To add two m-bit numbers, the required number of half adder is

 2m-1
 2m+1
 2m-1
 2m

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Digital Electronics
The main criterion in the design of a digital circuit is reduction of

 volume
 size
 cost
 weight

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Digital Electronics
The AND-OR realization of a combinational circuit requires three 3-input AND gates and one 3-input OR gate. This circuit can be designed using

 three 3-input NAND gates and one 3-input NOR gate
None of these
 four input NAND gates only
 three 3-input OR gates and one 3-input AND gate

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Digital Electronics
The set of which logic gates is designated as universal gate?

 XNOR, NOR, NAND.
 XNOR, NOR, NAND.
  NOR , NAND.
 NOT, OR , AND.

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