![GATE ECE 2001 Digital Circuits - Logic Gates Question 6 English 1](https://gateclass.cdn.examgoal.net/examside/questions/28b4de4172489d28e29ded11dfe4efedf3d6c05bec531e828fa51913dd497598.jpg)
![GATE ECE 2001 Digital Circuits - Logic Gates Question 6 English 2](https://gateclass.cdn.examgoal.net/examside/questions/c571f9b11aa6924f89dbd9520376fc4736e37b54a40c0341e52cefb57b58c242.jpg)
(a) Enter the logical values in the given Karnaugh map [figure2(b)] for the output
Y.
(b) Write down the expression for Y in sum-of products from using minimum
number of terms.
(c) Draw the circuit for the digital logic boxes using four 2-input NAND gates
only for each of the boxes.
![GATE ECE 2000 Digital Circuits - Logic Gates Question 5 English](https://gateclass.cdn.examgoal.net/examside/questions/0231274fad5049ed1893493b032bd9847c188a5107e13fb3b9bd13cf93d2942d.jpg)
(a) Enter the logical values in the K-map in the format shown in figure 3(a). Derive
the minimal Boolean sum-of-products expression whose output is zero when a majority of the pumps fail.
(b) The above expression is implemented using logic gates, and point P is the
output of this circuit, as shown in figure 3(b). P is at 0 V when a majority of the pumps fails and is at 5 V otherwise. Design a circuit to drive the LED using this output. The current through the LED should be 10 mA and the voltage drop across it is 1V. Assume that P can source or sink 10 mA and a 5 V supply is available.
![GATE ECE 1993 Digital Circuits - Logic Gates Question 7 English](https://gateclass.cdn.examgoal.net/examside/questions/34a214a096d971bc39dd133a9ea62e000567b722dad5f2cf54f6ac8e959fc78e.jpg)