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NCERT Physics Class 12 Exemplar Ch 14 Semiconductor Electronics Materials Devices and Simple Circuits Part 3
26 Two car garages have a common gate which needs to open automatically when a car enters either of the garages or cars enter both. Devise a circuit that resembles this situation using diodes for this situation.
Ans:
OR gate gives output according to the truth table.
A | B | C |
0 | 0 | 0 |
0 | 1 | 1 |
1 | 0 | 1 |
1 | 1 | 1 |
Q 27 How would you set up a circuit to obtain NOT gate using a transistor?
Input | Output |
A | A |
0 | 1 |
1 | 0 |
Q 28 Explain why elemental semiconductor cannot be used to make visible LEDs.
Elemental semiconductor՚s band-gap is such that emissions are in IR region.
Q 29 Write the truth table for the circuit shown in Fig.
Name the gate that the circuit resembles.
Ans:
Truth table
A | B | Y |
---|---|---|
0 | 0 | 0 |
0 | 1 | 0 |
1 | 0 | 0 |
1 | 1 | 1 |
AND Gate
Q 30 A Zener of power rating 1 W is to be used as a voltage regulator. If Zener has a breakdown of and it has to regulate voltage which fluctuated between and , what should be the value of Rs for safe operation (Fig.) ?
And: