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 EC6201 ELECTRONIC DEVICES UNITTEST-I Branch: ECE Maximum mark: !0 "# ar $ S#m#%#r: I ECE & $ II Da%#: 0'(02(201!  )&RT &  (7*2 = 14 Marks) 1. Define Mass – action law. And give the diode crre nt e!ation" 2. Draw #$ % characteristics of &' diode %ts Alications. . +hat is deletion region ,arrier &otential in &' -nction" 4. ive the e/ression for Drift Diffsion crrent densit0. . Define arl0 ffect. 3. Draw the characteristics of 5 ,5 configrations. 7. o6are 5 ,5 .  )&RT B  (*12 = 3 Marks) . (i) /lain the oeration of &' -nction nder forward 8ias condition with its characteristics. (3)  (ii)./lain the oeration of &' -nction nder reverse 8ias condition with its characteristics.(3) 9. (i). /lain details a8ot the switching characteristics on &' diode with neat :ketch. (3)  (ii). ive diode crrent e!ation (3) 1;. (i) /lain the oeration of '&' and &'& transistors.(3)  (ii) /lain the drift and diffsion crrent Densities for &' diode.(3) 11. (i) Draw the circit diagra6 of a '&' transistor configration and the in t and ott characteristics. Also define its oerating regions.(3) (ii).Draw the circit diagra6 of a '&' transistor , configration and the int and ott characteristics. Also define its oerating regions.(3)

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EC6201 ELECTRONIC DEVICES

UNITTEST-I

Branch: ECE Maximum marks: 50Year & Semester: I ECE A & IIDate: 07.02.2015

PART A (7*2 = 14 Marks)1. Define Mass action law. And give the diode current equation?2. Draw V-I characteristics of PN diode & Its Applications.3. What is depletion region & Barrier Potential in PN junction?4. Give the expression for Drift & Diffusion current density.5. Define Early Effect.6. Draw the characteristics of CE, CB, CC configurations.7. Compare CE, CB, CC.

PART B (3*12 = 36 Marks)

8. (i) Explain the operation of PN junction under forward bias condition with its characteristics. (6) (ii).Explain the operation of PN junction under reverse bias condition with its characteristics.(6)

9. (i). Explain details about the switching characteristics on PN diode with neat Sketch. (6) (ii). Give diode current equation (6)

10. (i) Explain the operation of NPN and PNP transistors.(6) (ii) Explain the drift and diffusion current Densities for PN diode.(6)

11. (i) Draw the circuit diagram of a NPN transistor CE configuration and the input and output characteristics. Also define its operating regions.(6) (ii).Draw the circuit diagram of a NPN transistor CB configuration and the input and output characteristics. Also define its operating regions.(6)


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