NCERT Physics Class 12 Exemplar Ch 14 Semiconductor Electronics Materials Devices and Simple Circuits Part 4

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Long Answer

31 If each diode in Fig. has a forward bias resistance of and infinite resistance in reverse bias, what will be the values of the current?

Has a forward bias resistance

Has a Forward Bias Resistance

Ans:

  • is zero as the diode in that branch is reverse bised. Resistance in the branch AB and EF are each

  • As AB and EF are identical parallel branches, their effective resistance is

  • Net resistance in the circuit

  • Current

  • As resistances of AB and EF are equal, and

Q 32 In the circuit shown in Fig., when the input voltage of the base resistance is, is zero and is also zero. Find the values of.

Find currents

Find Currents

Ans:

As , potential drop across is .

Since, potential drop across , i.e. is .

Q 33 Draw the output signals and in the given combination of gates (Fig.).

Draw the output of combination of gates (Q).

Draw the Output of Combination of Gates (Q)

Ans:

Output of combination of gates (Ans).

Output of Combination of Gates (Ans)

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