Electronics-I Question Paper of 3rd Semester Electrical(D) Download Previous Years Question Paper 1

S.B. Roll No……

ELECTRONICS-I

3^rd Exam/Elect/0264/Dec’05

Duration 3 Hrs.

Section –A

1.     Fill in the blanks

a.     The electrons in the outermost orbit are called ______ electrons.

b.      The capacitance of a reverse blazed PN junction Increases / decreases/ remains unaffected as the reverses blas is increased.

c.      For proper operation of an N-channel JFET, the gate voltage needs to be ___________ with respect to the drain.

d.     An amplifier hat an output of 2 v when an input signal of 40 mv is applied to it , its voltage gain is ________

e.      Holes are ________ carriers in an n-types semi-conductor

f.       DC load line of a transistor is drawn between two points called  _________ point and ____________ point.

g.     The operation of JFET involves a flow of minority carriers / a flow of majority carriers/ recombination.

h.     The turn on voltage of a germanium diode is 3/7/1.0 volt.

i.       In which condition does BJT act like a closed switch a, cut off b, saturation c, active region

j.       In a bipolar transistor, then base collector junction has; a forward bias b, revise bias c zero blas.

Section –B

          Note: Attempt any five questions

2.      

a.     With the help of a diagram, explain the functioning of an emitter bais circuit.

b.     What is transition region or depletion-region capacitance? Explain.

c.      What is a tunnel diode. Draw it symbol and explain its characteristics.

d.       What do you mean by hi-parameters of a transistor? Explain.

e.      Explain the working of an RC coupled amplifier using a circuit diagram.

f.       What is a Zener diode? With the help of a diagram explain is characteristics.

g.     Differentiate between dc and ac load lines.

Section –C

Note: Attempt any three questions.

3.     Draw and explain the common –source drain characteristics of an n- channel FET.

4.     With the help of a circuit diagram, explain the functioning of a bridge rectifier.

5.     What are direct coupled amplifiers? Discuss their limitations and applications.

6.     Write short notes on any two

a.     Transistor data heats

b.     Decibel gain

c.      Ple fitters