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Digital Design -Morris Mano
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ResnickHalliday Fundamentals of Physics 8th Ed
The following question appeared in Kerala Engineering Entrance 2009 Examination question paper:
Kerala Engineering and Medical Entrance Examination (KEAM) 2009 Questions on Digital Circuits
The truth table for the following logic circuit is
The top AND gate gets inputs (NOT A) and B. The bottom AND gate gets inputs A and (NOT B). The outputs of the two AND gates are respectively [(NOT A) AND B] and [A AND (NOT B)]. These are the inputs for the final OR gate. The output of the final OR gate is [(NOT A) AND B] OR [A AND (NOT B)]. This is the Boolean expression for the XOR gate (exclusive OR gate, also termed EXOR gate). The truth table for the XOR gate is given in option (A).
Even if you don’t know the XOR gate and its truth table, you can substitute values 0 and 1 for the inputs A and B and find the output in each trial. You can easily arrive at the answer given in option (A).
The following question appeared in Kerala Medical Entrance 2009 Examination question paper:
If the two inputs of a NAND gate are shorted, the gate is equivalent to
(a) XOR
(b) OR
(c) NOR
(d) NOT
(e) AND
If both inputs of a two input NAND gate are shorted, both inputs get the same signal. Because of the NOT operation at the output side of the NAND, the output is the complement of the input. The circuit therefore behaves as a NOT gate [Option (d)].
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Welcome to my world of distributed training.How many times have you been frustrated looking out for a particular information,be it a book, whitepaper,CBT's Simulators only to be disappointed being directed to a paid file hosting server.This is my world as well as your's for those seeking the materials needed for quickly grasping a subject.Request for any training materials and your wish will be granted.
Yours True Friend
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