Digital Electronics
The output of a NAND gate is low

 only when all the inputs are high
 only when all the inputs are low
 only when at least one input is high
 only when at least one input is low

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Digital Electronics
Positive logic in a logic circuit is one in which

logic 0 voltage level is higher than logic 1 voltage level
logic 0 voltage level is lower than logic 1 voltage level.
logic 0 and 1 are represented by 0 and positive voltage respectively
logic 0 and, -1 are represented by negative and positive voltages respectively

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