NCERT Physics Class 12 Exemplar Ch 14 Semiconductor Electronics Materials Devices and Simple Circuits Part 3

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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:

Two car garages have a common gate automatically

Two Car Garages Have a Common Gate Automatically

Two car garages have a common gate automatically

OR gate gives output according to the truth table.

Title: Table of Gate Gives Output According to the Truth Table
A B C 0 0 0 0 1 1 1 0 1 1 1 1

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?

circuit to obtain NOT gate using a transistor

Circuit to Obtain NOT Gate Using a Transistor

circuit to obtain NOT gate using a transistor

Title: Table of Input and Output
Input Output A A 0 1 1 0

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.

Write the truth table for the circuit

Write the Truth Table for the Circuit

Write the truth table for the circuit

Ans:

Truth table

Title: Table of Truth Table
A B Y 0 0 0 0 1 0 1 0 0 1 1 1

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.)?

A Zener of power rating 1 W voltage regulator

A Zener of Power Rating 1 W Voltage Regulator

A Zener of power rating 1 W voltage regulator

And: