STUPIDSID
GTU Electronics and Communication Engineering (Semester 3)
Electronic Devices and Circuits
December 2015
Electronic Devices and Circuits
December 2015
1(a)
How much forward diode voltage is there with the ideal diode Approximation?
1 M
1(b)
Which device is work as voltage controlled?
1 M
1(c)
What is the maximum efficiency of a class B push-pull amplifier?
1 M
Solved any one question from Q.2(b) & Q.2(c)
1(d)
What is the maximum peak to peak unclipped output if an emitter follower has V CEQ =6V, I CQ =200mA and re=10Ω?
1 M
1(e)
What is the total ac emitter resistance of an emitter follower?
1 M
Solved any one question from Q.3 & Q.4
1(f)
Write down the use of a common base amplifier.
1 M
1(g)
Which feedback is used by the swamped amplifier?
1 M
1(h)
What kind of the effect on the output voltage if bypass capacitor is not present?
1 M
1(i)
What is the value of the AC resistance of the emitter diode if the AC voltage across the emitter diode is 1mV and emitter current is 100μA?
1 M
Solved any one question from Q.5 & Q.6
1(j)
Which circuit is removing positive or negative parts of a wave form?
1 M
1(k)
What is the value of base current if the current gain is 100 and collector current is 10mA?
1 M
1(l)
Which diode has a negative resistance region?
1 M
1(m)
Which diode has a forward voltage drop of approximately 0.25V?
1 M
Solved any one question from Q.7 & Q.8
1(n)
If N1/N2 =4 and the primary voltage is 120V, what is the secondary voltage?
1 M
2(a)
What is semiconductor? Define n-type semiconductor
3 M
2(b)
Give minimum four comparison of LED and photo diode.
4 M
2(c)
Explain bridge rectifier in detail.
7 M
Short Questions
2(d)
Explain parallel clipper circuit in detail.
7 M
3(a)
If the base current of transistor is 30μA when the emitter current is 7.2 mA, what are the values of β and α?
3 M
3(b)
Write the advantages of transistor, and explain why it is called ??Bipolar Transistor????
4 M
3(c)
Explain biased and unbiased NPN transistor in detail.
7 M
4(a)
Explain applications of optocoupler.
3 M
4(b)
Explain advantages and disadvantages of photo transistor.
4 M
4(c)
Explain Voltage Divider Bias biasing in detail with its circuit operation and required equations.
7 M
5(a)
Draw T model and ? model circuit for CE amplifier.
3 M
5(b)
State and Explain miller's theorem.
4 M
5(c)
Explain Darlington pair in detail, also derive its current gain
7 M
6(a)
A JFET has a pinch off voltage of -4 volts and the saturation current of 9 mA. calculate the drain current if V GS =-2 volts.
3 M
6(b)
State the advantages and disadvantaged of FET over BJT.
4 M
6(c)
Explain construction, operation and characteristic of
n-channel Depletion MOSFET in detail.
7 M
7(a)
What is the difference between voltage amplifier and power
Amplifier?
3 M
7(b)
Compare different types of power amplifier based on conduction angle, position of Q-point, efficiency and distortion
4 M
7(c)
Explain operation of class B-push pull amplifier with the help
of circuit and wave form.
7 M
Solved any one question from Q.2(c) & Q.2(d)
8(a)
In a negative feedback amplifier A=100, β=0.02 and input
voltage is 40 mV. Determine voltage gain with feedback, output voltage and feedback voltsge.
3 M
8(b)
Obtain the expression for transistor gain for negative feedback.
4 M
Solved any one question from Q.3 & Q.4
8(c)
Derive the expression of the input resistance with feedback for current series feedback amplifier.
7 M
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