University of Mumbai 2009-3rd Sem B.E Electrical and Electronics Engineering Basic Electronics Old - Question Paper

Basic Electronics Old Course Sem III May 2009

(3 Hours)

six questions.

(3)    Figures to the right indicate full marks.

I. (a) Define the terms of FET :

(i) Pinch-off voltage ' (i i) Trans-conductancc

(iii) Drain resistance.

(b)    Differentiate between BJT and FET

(c)    Differentiate between Scries Voltage Regulator and Shunt Voltage Regulator.

(d)    Explain the construction of a Solar cell.

2.    (a) Draw circuit diagram of full wave reciifier with CLC filter.

Ivxplain its working with neal sketches. Derive relation for ripple factor.

(b) Define polarization and explain the different types of polarizations in dielectrics. 10

3.    (a) For the zener diode circuit shown below, determine V_t , V_R and    5

iiAAA/vw-

(L- <kjl.

Vt*-(oV

(b)    Compare Fixed bias with collector to base bias in case of BJT.    5

(c)    In the circuit shown in figure, determine the co-ordinates of operating point of 10 die transistor. Draw the DC load line on output characteristics and show the location

* *

Con. 2756-VR-3048-09.    2

4.    (a) Oivc th methods used for biasing the JFET with operating points.    8

(b) Explain the procedure for designing a single stage CS amplifier for audio frequency 12 range using zero temperature drift.

5.    Design a single stage R-C coupled CE amplifier using the transistor BCI47A to meet 20 the following/:

I Av | > 180. V₀ = 3V_f S_]CO< 10_tf_L = 20Hz,V_cc= 18V.

Given : Data for BC 147A :

ic_max - 0-1 Amp, Pd_m - 0-25 W, h_FE(TYP) = 180,

h_rehyp) = 220, h_lc = 2-7 kCJ.

Calculate Ri, Ro and Av of the designed circuit.

6.    (a) Draw a circuit diagram of the full dual clipper circuit to have clipping levels 10

of 5V. Explain its operation with the help of appropriate waveforms and transfer characteristics.

(b) Explain the Hall effect and derive the expression for Hall coefficient.    10

7.    Write notes on following :    20

(a)    Types of capacitors

(b)    BJT as a switch

(c)    Thermistors and their applications

(d)    Base width modulation and its consequences.

Attachment: university-of-mumbai-2009-b-e-electrical-and-electronics-engineering-51173-1.pdf

Earning:   Approval pending.