STUPIDSID
1(a)
Explain how transistor can be used as switch.
5 M
1(b)
Determine the value of the resistors\[R_{e}\ and\ R_{c}\ for \ the \ circuit\ show\ in\ Q1\ (b)\ given\ that\ R\ = \5k\Omega ,\ \beta = 200,V_{CEQ}=5\ V\ and\ I_{CEQ}\ =2\ mA\ for\]the silicon made transistor.
8 M
1(c)
Briefly discuss the working operation of silicon controlled rectifier.
7 M
2(a)
Explain with neat sketches the operation and characteristics of N-channel DE-MOSFET>
8 M
2(b)
Calculate the value of operating point for circuit shown in fig.Q2 (b) given that threshold voltage for the MOSFET IS 2v AND JD(ON)=6 mA for VGS(ON)=5 V
7 M
2(C)
Write the advantages of MOSFET over JFET.
5 M
3(a)
Briefly discuss with necessary diagrams the working operation, characteristic and parameters of light Emitting Diode.
10 M
3(b)
A photo diode has a noise current of i fa responsivity figure of 0.5 A/W. Determine is Noise Equivalent Power (NEP) and Selectivity (D).
5 M
3(c)
Briefly explain the working operation of opto-couplers.
5 M
4(a)
Explain the effect of Bypass capacitors and coupling on the low frequency response of the transistor based amplifier.
6 M
4(b)
Draw the hybrid equivalent circuit of transistor in all three configurations given that the hybrid parameters for the transistor are hie=1.5?,hie - 150,hie-1×10-4 and hoe=20 umhos.
10 M
4(c)
What are the advantages of cascade amplifiers on overall frequency response of the amplifiers?
4 M
5(a)
A power amplifier in class B operation provides a 20V peak output signal to 15Ω load the system operates on a power supply of 25 V. Determine the efficiency of the amplifier.
8 M
5(b)
The total harmonic distortion of an amplifier reduces for 10% to 1% on introduction of 10% negative feedback.Determine the open loop and closed loop again values.
6 M
5(c)
Explain the advantages of negative feedback in amplifiers.i
6 M
6(a)
What are sinusoidal oscillators?Explain the Barkhausen criterion for sustained oscillations.
8 M
6(b)
With a neat circuit diagram,explain the principal od operation of buffered RC phase shift oscillator.
5 M
6(C)
Discuss briefly the working operation of Astable multivibrator using IC555 timer.
7 M
7(a)
Explain with neat diagram and relevant waveforms,the principle of operation on inverting regulator.
8 M
7(b)
The regulated power supply provides a ripple rejection of-80db.if the ripple voltage in the unregulated input 10 2V,calculate the output ripple.
6 M
7(c)
Explain the important features and parameters of switched mode power supplies(SMPS)
6 M
8(a)
What are active filters using op-amp? Explain first order low pass and high pass filters with again.
8 M
8(b)
Explain with circuit the working operation of instrumentation amplifier.
7 M
8(c)
Calculate the values ofR1,R2,C1,C2 and R3 if the filter had a cut off frequency fo 10 Khz. Q factor of 0.707 and input impedance not less than 10k ? for the fig.Q8 (c) shows a second order low pass filter built around a single operational amplifier.
5 M
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