STUPIDSID
Solve any one question.Q1(a,b) Q2(a,b)
1(a)
Draw and explain the construction and working of N-channel JFET.
6 M
Solve any one question.Q1(a,b) Q2(a,b)
1(a)
Find the current through ZL by using Thevenin's theorem in the circuit shown below:
!mage
!mage
6 M
1(b)
Explain the following non-ideal V-I characteristics MOSFET:
i) Finite output resistance
ii) Subthreshold conduction
iii) Breakdown effects.
i) Finite output resistance
ii) Subthreshold conduction
iii) Breakdown effects.
6 M
1(b)
Explain and draw the quivalent and approximate circuit of the signle phase transformer referred to primary.
6 M
2(a)
Determine the operating point (IDQ,
VDSQ of the JFET circuit as shown in figure(1). CalculateRS.
!mage
VDSQ of the JFET circuit as shown in figure(1). CalculateRS.
!mage
6 M
2(a)
A 10 kVA transfromer has a full load efficiency of 96%. The copper loss and iron are equal Table given below shows the loading schedule of the transformer during a day. Calculate all day efficiency:
| Loading | No. of hours |
| No load | 10 |
| Full load | 2 |
| Half load | 5 |
| Quarter load | 7 |
6 M
2(b)
Draw the constructional diagram of N channel E-MOSFET and give drain and transfer characteristics for the same with necessary parameters.
6 M
2(b)
State and explain: maximum power transfer theorem and Norton's theorem.
6 M
Solve any one question.Q3(a,b) Q4(a,b)
3(a)
For the circuit diagram shown in Fig.2, determine the gm,
Av,
Ri,
Ro.
!mage
Av,
Ri,
Ro.
!mage
8 M
Solve any one question.Q3(a,b) Q4(a,b)
3(a)
Derive the torque equation for D.C. motor. Draw the torque- current, speed-current characteristics of a shunt motor using torque equation or otherwise.
6 M
3(b)
Write short note on constant current source using MOSFET.
4 M
3(b)
Discuss briefly different methods of speed controol for three phase induction motors.
6 M
4(a)
Explain the BiCMOS technology with suitable diagram.
6 M
4(a)
Explain the difference between the squirrel cage induction rotor and slip ring induction rotor.
6 M
4(b)
Explain how MOSFET can be used as Active resistor in VLSI circuits.
6 M
4(b)
A 100 kW belt deriven D.C. shunt generator running at 500 rpm on 220 V supply, continues to run as a motor when the belt breaks. When it runs as a motor, it draws 12kW from supply. Find the speed at which it will run as a motor. The resistances of armature and field are 0.025Ω and 55Ω respectively. The total brush contact drop is 2 V.
6 M
Solve any one question.Q5(a,b) Q6(a,b)
5(a)
Draw the different types of feedback topologies and compare their input and output impedances.
8 M
Solve any one question.Q5(a,b) Q6(a,b)
5(a)
Explain the construction and working principle of BLDG motor. Also draw its speed torque characteristics.
7 M
5(b)
Give the Barkhausen criterion and draw and LC oscillator circuit.
5 M
5(b)
Write a short note on Reluctance motor.
6 M
6(a)
For the circuit diagram shown in Fig.3, determine the G mf,
Avf,
Rif,
Rof.
!mage
Avf,
Rif,
Rof.
!mage
8 M
6(a)
Explain the construction and working principle of Universal Motor.
7 M
6(b)
Differentiate RC and LC oscillator and draw RC phase shift oscillator using FET.
5 M
6(b)
Distinguish between Brushless D.C. motor and Conventional D.C. motor.
6 M
Solve any one question.Q7(a,b) Q8(a,b)
7(a)
Draw and explain block diagram of adjustable positive three terminal voltage regulator.
8 M
Solve any one question.Q7(a,b) Q8(a,b)
7(a)
Explain the working principle of permanent magnet Stepper motor with constructional diagram.
7 M
7(b)
Compare linear regulator and SMPS.
5 M
7(b)
Draw and explain characteristics of D.C. Servomotor.
6 M
8(a)
Explain SMPS using suitable block diagram.
7 M
8(a)
Describe the principle of operation of single-phase split phase type induction. Motor along with its circuit and phasor diagram.
7 M
8(b)
Design an adjustable voltage regulator using LM317 for output voltage 5-15 volts and draw necessary connection diagram. (Assume R1=240Ω and Iadjustable= 100 μA).
6 M
8(b)
What is Stepper motor? Explain the concept of Stepper motor.
6 M
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