Veer Narmad South Gujarat University 2010 B.E EC-306 C - Electronics & Instrumentation - 2 ( Sem3 )( Civil ) - Question Paper
RN-6151
B. E. II (Sem. Ill) (Civil) Examination May/June - 2010 EC-306 C - Electronics & Instrumentation
[Total Marks : 100
Time : Hours]
Instructions
Seat No.:
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Fillup strictly the details of signs on your answer book.
Name of the Examination :
B. E. 2 (Sem. 3) (Civil)
Name of the Subject:
EC-306 C - Electroncis & Instrumentation
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-Subject Code No. |
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-Section No. (1,2,.....): 1&2 |
(2) Attempt all the questions.
(3) Assume suitable data whenever necessary.
(4) Figures to right indicate full marks.
(5) Use scientific calculators casio fx 82, 83, 100 or equivalent of any company.
(6) Write both the sections on separate answer books.
Answer the following :
(a)
10
(i)
(ii)
(iii)
(iv)
(v)
where Ic and 1 are
IC =
E
collector and emitter currents of BJT.
Define : Knee voltage.
What is requirement of filter ckt?
Define : PIV
In a semiconductor, doner type impurities must have at least _valance electrons.
(vi) Draw the symbol of NPN transistor.
(vii) Draw the symbol of SCR.
(viii) Give the relation between a and (3 parameter of transistor.
The ripple factor of a half wave rectifier is_.
If +ve terminal of battery is connected in P-type of material and -ve terminal of battery is connected to a n-type material. Then this bias is called as
a !E +
(ix)
(x)
(b) Find the rms value of output for center-top rectifier. 6
(c) Explain intrinsic and extrinsic semiconductor. 4
2 (a) Explain basic working of NPN and PNP transistor. 7
(b) Explain UJT as a relaxation oscillator with ckt
diagram and necessary waveform. 8
OR
2 (a) What is necessary condition for oscillator ckt to 7
generate oscillation? Draw the ckt diagram of wein bridge oscillation and its working.
Draw and explain the circuit diagram of zener diode voltage regulator in brief.
3 (a) Explain full wave bridge rectifier with necessary 7
waveforms.
OR
3 (a) Describe the construction and working of UJT. 8
Define the term "Intrinsic stand off ratio'.
(b) Explain class A, class B, class C amplifier.
SECTION - II
4 (a) Explain the following terms : 10
(i) Electronic Instrument
(ii) Gross Error
(iii) Accuracy
(iv) Linearity
(v) Resolution
(c) Classified transducer and explain in detail. 5
5 (a) Derive the strain gauge factor equation Gf (l+2v) with 8
proper derivation.
(b) Draw the basic block diagram of CRO and explain 8 each block in detail.
5 (a) Describe with diagram, the operation of LVDT. 8
(b) Write a short note on capacitive transducer. 8
6 (a) Write any two : 10
(i) Explain in detail : Hat wire anemometer.
(ii) Explain semiconductor strain gauge in detail
(iii) State salient feature and application of thermistor
(b) State 4 advantages and 4 disadvantages of LVDT. 4
RN-6151] 2 [ 100 ]
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| Earning: Approval pending. |
