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Digital Electronics

Digital Electronics
A full adder has

 2 inputs, 1 output
 3 inputs, 1 output
 3 inputs, 2 outputs
 2 inputs, 2 outputs

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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

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

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Digital Electronics
NAND. gates are preferred over others because these

consume least electronic power
provide maximum density in a chip.
can be used to make any gate
have lower fabrication area

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Digital Electronics
While using a frequency counter for measuring frequency, two modes of measurement are possible. 1. Period time 2. Frequency mode There is a ‘cross-over frequency’ below which the period mode is preferred. Assuming the crystal oscillator frequency to be 4Mhz the crossover frequency is given by

 8 Mhz
 2 Mhz
 1 Khz
 2 Khz

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Digital Electronics
Which of the following is equivalant to an ODD function

 AND-NOR
 XNOR
 XOR
 NOR

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Digital Electronics
The binary number designations of the rows and columns of the K-map are in

 BCD code
 Gray code
 XS-3 code
 binary code

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