STUPIDSID
1(a)
What is Zener diode?
2 M
1(b)
Why CE configuration is generally used?
2 M
1(c)
Explain FET
3 M
Solve any one question from Q.1(d) & Q.1(e)
1(d)
The following test results were obtained in a CE amplifier circuit while measuring h-parameters experimentally :
i) With AC output shorted Ib=25μA, Ic=1.2mA, Vbe=30mV and Vce=1.2V
ii) With AC input open circuited Ib=32μ, Vbe=0.3mV and Vce=1.2V
Determine hybrid parameters of the transistor.
i) With AC output shorted Ib=25μA, Ic=1.2mA, Vbe=30mV and Vce=1.2V
ii) With AC input open circuited Ib=32μ, Vbe=0.3mV and Vce=1.2V
Determine hybrid parameters of the transistor.
7 M
1(e)
The collector and bare current of an N-P-N transistor are measured as IC=5mA, IB=50μA and ICBO=1μA
i) Determine α β and IE
ii) Determine new level of IB required to produce IC=10mA.
i) Determine α β and IE
ii) Determine new level of IB required to produce IC=10mA.
7 M
2(a)
Write down the advantage of negative feedback
2 M
2(b)
What is power amplifier?
2 M
2(c)
Compare class A, B and C amplifier.
2 M
Solve any one question from Q.2(d) & Q.2(e)
2(d)
In a transistor Colpitt's oscillator L=100μF, C2=0.01μF and Cc =10μF, Determine:
i)Operating frequency
ii) Feedback fraction
iii) Minimum gain to sustain oscillations and emitter resistance if RC=2.5k Ω
i)Operating frequency
ii) Feedback fraction
iii) Minimum gain to sustain oscillations and emitter resistance if RC=2.5k Ω
7 M
2(e)
Derive an expression for frequency of oscillation for Wine Bridge Oscillator
7 M
3(a)
What is Cascade amplifier?
2 M
3(b)
What is multivariate? What are their various types?
2 M
Solve any one question from Q.3(d) & Q.3(e)
3(d)
Describe darling amplifier and bootstrapping technique in detail with suitable diagram.
7 M
3(e)
In the following circuit, VB1=Vid/2,and VB2VB2=Vid/2 where Vid is small signal with zero voltage find the magnitude of different gain
7 M
4(a)
What is instrumentation amplifier?
2 M
4(b)
Define Slew rate and Offset voltage.
2 M
4(c)
Explain OP-amp as differentiated, summer and integrator with suitable diagram.
2 M
Solve any one question from Q.4(d) & Q.4(e)
4(d)
Describe Schmitt trigger.
7 M
4(e)
Describe 555 timer as a stable vibrator.
7 M
5(a)
What do you understand by regulated power supply?
2 M
5(b)
Explain about UPS
2 M
5(c)
Explain current limiting circuits
2 M
Solve any one question from Q.5(d) & Q.5(e)
5(d)
Describe SMPS in detail. How it is different from linear power supply?
7 M
5(e)
Describe voltage regulators. What are the various types of voltage regulators?
7 M
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