D ൧1109 Pages: 2

12 a) Explain the working principle of LEDs? Also discuss the various types of LEDs. (6)

b) Explain about the working of a photo diode. (4)
“ತೆ Module 111
13 Explain the input and output characteristics of an NPN transistor in CE (10)

configuration. Indicate active, cut-off and saturation regions in output

characteristics.
OR
14 Explain an RC coupled amplifier with the frequency response. (10)
Module IV
15 ஐ Explain the structure and operation of n-channel FET. ⋅ . (6)
b) Draw and explain the drain and transfer characteristic curves of n-channel FET (4)
OR

16 a) Explain the working principle of SCR. Draw and explain the characteristics of (8)

SCR.
b) Explain holding current and latching currents in SCR. (2)
Module ५
17 a) Explain the working of half wave rectifier with diagram (4)
തത്ത... Derive the RMS value, DC value, ripple factor of a Half Wave Rectifier. (6)
ணை ~ OR ` ‏سكسس سمت‎ படட
18 Explain the working of SMPS with block diagram. What are its applications? (10)
Module VI
19 Describe the working of CRT with diagram. (10)
OR
20 a) Draw the block diagram of a digital storage oscilloscope and explain its working. (8)
b) Give the advantages of DSO over CRO (2)
1;

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