Veer Narmad South Gujarat University 2011-1st Year B.Sc Electronics SB-0612 - 1 ( Old ) - Question Paper

SB-0612

First Year B. Sc. Examination March / April - 2011 Electronics : Paper - I

(Electronics Devices & Components)

Time : 3 Hours]    [Total Marks : 70

Instruction

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Fillup strictly the details of signs on your answer book.

Name of the Examination :

F. Y. B. Sc.

Name of the Subject:

Electronics - 1

-Subject Code No.:

0 6 1 2

-Section No. (1,2,.....): Nil

(a)    What is V.D.R and L.D.R ? Explain in brief

(b)    Write note on LVDT

(a)    Compare conductor, semiconductor and insulator

(b)    What is Avalanche and Zener breakdown ? Explain with figure.

(c)    How is transistor working as switch?

OR

(a)    Explain diode characteristics with figure.

(b)    Briefly explain working of SCR

(3) If V_F = 0.9 and I_F = 18 mA in forward diode

characteristics, calculate the static forward resistance.

4 (a) Define a . Show that it is always less than unity    8

a

Define /? , Show that P (l-a)

(b)    Draw the load line and explain the importance    3 of load line

(c)    A transistor has an I_c of 100 mA and I_B of 0.6 mA. 3 What is the value of a_dc ?

OR

4 (a) Explain principle and working MOSFET    8

working of UJT.

5 Write short notes on any two :    7x2=14

(a)    Tunnel diode

(b)    Reed relay

(c)    Photo voltaic Cell

(d)    TRIAC.

SB-0612]    2    [ 300 ]

Attachment: veer-narmad-south-gujarat-university-2011-b-sc-electronics-28532-1.pdf

Earning:   Approval pending.