STUPIDSID
1 (a)
Draw a self bias circuit using BJT and derive the expression for operating point. Mention its advantages and disadvantage.
8 M
1 (b)
For the circuit shown in Fig.Q1(b), determine the operating point. Given β;=100, VBE=0.7 V.
4 M
1 (c)
Explain the construction and operating principle of uni junction transistor (UJT) with relevant sketches.
8 M
2 (a)
Explain the construction, working and characteristics of N-channel E-MOSFET with neat sketches.
10 M
2 (b)
Given a comparison between JFETs and MOSFETs (any four).
4 M
2 (c)
Briefly discuss the basic operation of CMOS inverter with a neat diagram. Mention any two advantages.
6 M
3 (a)
With a neat diagram, explain the working of a photo conductor. Show how resistance varies with illuminance. Draw any two application circuits.
10 M
3 (b)
What is an optocoupler? Explain the parameters of optocoupler.
6 M
3 (c)
A photodiode has a noise current of 1 × 10-15 A, responsivity of 0.5 A/W, active area of 1mm2 and rise time of 3.5ns. Determine its (i) NEP; (ii) Detectivity; (iii) D*; (iv) Quantum efficiency at 850nm.
4 M
4 (a)
Obtain the expression for current gain, input impedence, voltage gain and output admittance of a transistor amplifier using complete h-parameter model.
12 M
4 (b)
Fig.Q4(b) shows a Darlington amplifier. The two transistors Q1 and Q2 are identical and the h-parameter for both the transistors are hic=1 KΩ , hfc=1 KΩ and hoc=40 × 10-6 mhos. THe values of voltages Vcc=15V, VBE1=0.7V and VBE2=0.7V. Determine the following:
(i) Input impedance; (ii) Output impedance; (iii) VOltage gain; (iv) Current gain.
(i) Input impedance; (ii) Output impedance; (iii) VOltage gain; (iv) Current gain.
8 M
5 (a)
Derive the expression for voltage gain, input resistance and output resistance in a voltage series feedback topology.
10 M
5 (b)
List the advantages and disadvantages of negative feedback.
6 M
5 (c)
Derive an expression for gain of an amplifier with feedback in terms of gain without feedback.
4 M
6 (a)
Explain the operation of monostable multivibrator with a neat diagram.
8 M
6 (b)
Explain RC low pass circuit and discuss the behaviour of this circuit towards step and pulse inputs.
8 M
6 (c)
Write a note on Barkhausen criterion.
4 M
7 (a)
Explain the operation of buck regulator with a neat diagram.
10 M
7 (b)
Design a power transformer with a multi-output secondary and the following input/output specifications:
I. Primary voltage: 220V, 50Hz.
II. Secondary voltage: i) 12-0-12V at 100 mA and ii) 5V at 1A.
Assume B=60,000 lines per square inch and an efficiency of 90%.
I. Primary voltage: 220V, 50Hz.
II. Secondary voltage: i) 12-0-12V at 100 mA and ii) 5V at 1A.
Assume B=60,000 lines per square inch and an efficiency of 90%.
6 M
7 (c)
Define load regulation and line regulation of regulated power supply.
4 M
8 (a)
List and explain the performance parameter of operational amplifiers.
8 M
8 (b)
Explain the working of comparators as zero crossing detectors.
6 M
8 (c)
For the relaxation oscillator circuit shown in Fig. Q8(c).determine the heat to heat amplitude and frequency of the square wave output given that saturation output voltage of the opamp is ± 12.5 V at power supply voltage of ± 15V.
6 M
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