Rajiv Gandhi Proudyogiki Vishwavidyalaya 2010 B.E _basic_electronics(107)_ - Question Paper
"Tbtal NG. of Questions ;' 10 ] [ Total No. of Printed Pages : 3
Roil No.
B. E. (First/Second Semester) EXAMINATION, Feb., 2010 (Common to all Branches)
BASIC ELECTRONICS Time : Three Hours Maximum Marks : 100 Minimum Pass Marks : 35
Not*: Attempt any one question from each Unit. All questions carry equal marks.
Unit I
1. (a) What is a semiconductor ? Which are the commonly
used semiconductors ? How are n-type and p-type semiconductors obtained ?
(b) Explain in detail the V-I characteristics of a semiconductor diode.
Or
2. (a) What is a p-n junction ? Explain the formation of
depletion layer in an unbiased p-n junction. How does it vary with external Bias ?
(b) Give the structure of a transistor and the circuit symbol. Compare the physical sizes, doping levels and the functions of the three layer in the transistor.
P. T. O.
[ 2 ] UnitII
3. (a) With the help of circuit diagram explain the working.
B-107
of a half wave rectifier. Show the relevant wave forms, (b) Obtain expression for efficient of rectification and ripple factor for half wave rectifier.
Or
4. Draw the circuit and characteristics of low pass filter and explain its working.
(b) What are the disadvantages of half wave rectifier ? How are they overcome in full wave rectifier ? Unit-111
(a) With the help of neat sketch, describe the construction ' and working of CKT in CRO.
(b) Describe how CRO can be used to measure the amplitude, frequency of wave forms. _
Or
6. Explain the working and applications of the following :
(i) Multimeter
fit) LCR-Q meter
Unit IV T
7. (a) Do the following conversions :
(i) mw = ( >2
~ (ii) (1527)8 = ( )10
(iii) (25)g = ( )2
(iv) (10110011)2 = ( )16
(b) Write symbols and truth table for the following :
(i) NAND gate
(ii) NOR gate
[ 3 ] Or
Draw the circuit diagram of half adder with the help of truth table. Also give expression for sum and cany,
(b) Explain J-K flip-flop with the help of circuit diagram. Unit V
9. (a) Give classification of ICs based on density level.
(b) Draw the circuit of an Op-Amp. used in an integrator. Explain its working.
Or
TT)(a) With the help of a sketch, show how an Op-Amp. can be used as a differentrator.
(b) Explain 555 timer with the aid of circuit diagram and explain its applications.
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