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At what temperature the saturation current will be the twice of the diode current
when the contact potential of the diode is 15 V. Assuming the diode is made by
silicon material.
Find the solution of the diffusion equation in the base region where the
diffusion length is .02 m and the distance between emitter depletion region and
collector depletion region is 1 cm. Given that the hole concentration at the
emitter depletion region is 100 cm-3 whereas the hole concentration at the
collector depletion region can be neglected.
The hot resistance of an incandescent lamp is 10 ohms and the rated voltage is 50 V. Find the resistance required to operate the lamp from an 80 V supply.
Class Coordinator of the section 01 wants to select the student class representative. A student is
eligible to become class representative if he/she has scored minimum of 75% in 12th Standard and
less than 15K ranking in the entrance test.
A software needs to be developed to help Class coordinator to select the class representative.
1. Students rank in entrance test should be captured.
2. Students 12th percentage should be captured.
3. Check if rank is less than 15k and 12th percentage is more than 75%
4. If both the criteria is true, Display Eligible.
5. If any one of the criteria is false, Display Not Eligible
a. What is doping?
[2 marks]
b. Describe the difference between majority and minority carriers.
[4 marks]
c. With the use if diagrams explain how a diode is connected in reverse and forward bias.
[8 marks]
d. Draw and label the characteristics curve for a silicon pn junction diode.
[5 marks]
e. Explain with the use of a diagram how a full wave rectifier converts ac current to direct current.
a. Define the following terms:
i. Permeability ii. Magnetic field strength iii. Magnetic flux density
[3 marks]
b.
i. Determine the inductance of a coil 0.01m long, 4 turns, cross-sectional area of
0. Im2 with a permeability of the core material is 0.25x10-3H/m.
[4 marks]
ii. If a current of 3A flow for 5ms what is the induce voltage.
[2 marks]
c. Calculate the flux density produced by a magnetizing force of 2000 At/m in a steel of relative permeability 400.
a. At what point in an RLC circuit does resonance occur? [3marks]
b. The resonant frequency of a series RLC circuit is 2380kHz when the current is 560 PA and the voltage across it is 240mV. If the value of the inductance in the circuit is 60gH, find the resistance and the capacitance.
[6 marks]
c. A resistor of 150, an inductor of 0.0318H and a 150uF capacitor are connected in series to a 240V sinusoidal supply at 50Hz. Calculate:
i. The impedance of the whole circuit; [6 marks] ii. The circuit current; [3 marks] iii. The voltage across each component; [4 marks] iv. The power factor; [3 marks]
A self bias circuit uses Si transistor, RC = 330 Ω, RE = 100 Ω and VCC = 12 V. Estimate the values of R1 and R2 required to provide a base current of 0.3 mA, so as to locate the operating point at ICQ = 18 mA and VCEQ = 4.25 V
Suppose if the transistor used in problem 1 failed and was replaced with a
new transistor with β = 75. Is the new transistor still biased for active region
operation? (calculate Q-point and then conclude)
Find the charge flowing q(t) through a device if the current is i(t) = 10 e-30t sin 40t A,
q(0) = 0
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#339914 on Dec 2023