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#### Semiconductor Electronics Five Marks Questions

12th Standard EM

Reg.No. :
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Physics

Time : 01:00:00 Hrs
Total Marks : 50
10 x 5 = 50
1. The given circuit has two ideal diodes connected as shown in figure below. Calculate the current flowing through the resistance R1

2. Four silicon diodes and a 10 Ω resistor are connected as shown in figure below. Each diode has a resistance of 1Ω. Find the current flows through the 18Ω resistor.

3. Assuming VCEsat= 0.2 V and β = 50, find the minimum base current (IB) required to drive the transistor given in the figure to saturation.

4. A transistor having a = 0.99 and VBE = 0.7V collector current, is given in the circuit. Find the value of the collector current.

5. In the circuit shown in the figure, the BJT has a current gain (β) of 50. For an emitter - base voltage VEB = 600 mV, calculate the emitter - collector voltage VEC (in volts)

6. In the circuit shown in the figure, the input voltage Vi is 20 V, VBE = 0 V and VCE = 0 V. What are the values of IB, IC, β?

7. The current gain of a common emitter transistor circuit shown in figure is 120. Draw the dc load line and mark the Q point on it. (VBE to be ignored).

8. What is the output Y in the following circuit, when all the three inputs A, B, and C are first 0 and then 1?

9. In the combination of the following gates, write the Boolean equation for output Y in terms of inputs A and B.

10. Simplify the Boolean identity
AC + ABC = AC