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Digital Electronics - Engineering

Q1:

In the figure, the LED

A emits light when both S1 and S2 are closed

B emits light when both S1 and S2 are open

C emits light when only S1 and S2 is closed

D does not Emit light, irrespective of the switched positions

ANS:D - does not Emit light, irrespective of the switched positions

To emit the light, it is necessary NAND gate output is zero, for NAND O/P zero. Both the I/O must be height. And it is not possible in any case.