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 Z

!mage

_{L}by using Thevenin's theorem in the circuit shown below:!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 (I

V

!mage

_{DQ},V

_{DSQ}of the JFET circuit as shown in figure(1). CalculateR_{S}.!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 g

A

R

R

!mage

_{m},A

_{v},R

_{i},R

_{o}.!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

A

R

R

!mage

_{mf},A

_{vf},R

_{if},R

_{of}.!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 R

_{1}=240Ω and I_{adjustable= 100 μA).}
6 M

8(b)
What is Stepper motor? Explain the concept of Stepper motor.

6 M

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