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Electrical Circuits and Machines Question Paper - Jun 18 - Electronics And Telecomm (Semester 3) - Pune University (PU)
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Electrical Circuits and Machines - Jun 18
Electronics And Telecomm (Semester 3)
Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.
1.a.
Find current Ix.
(6 marks)
00
1.b.
Explain open circuit test and short circuit test to be performed on transformer with neat circuit diagram.
(6 marks)
00
OR
2.a.
A 50 K V A, 2200/22 V, 50 Hz single phase transformer has an iron loss of 300 W. The resistances of low and high voltage winding's are 0.005 $\Omega$ and 0.5 $\Omega$ respectively. If the p.f. is 0.8 lagging, calculate maximum efficiency.
(6 marks)
00
2.b.
State and explain : Maximum power transfer theorem.
(6 marks)
00
3.a
Derive emf equation for DC generator.
(6 marks)
00
3.b.
Explain the working principle of synchronous motor.
(6 marks)
00
OR
4.a.
With the help of neat diagram explain the Torque slip characteristics of induction motor.
(6 marks)
00
4.b.
A 4 pole, 250 V, DC series motor has a wave connected armature with 200 conductors. The flux per pole is 25 mWb when the motor is drawing 60 A from the supply. Armature resistance is 0.15 $\Omega$ while the series field winding resistance is 0.2 $\Omega$. Calculate speed under this condition.
(6 marks)
00
5.a.
Explain the construction and working principle of BLDC motor. Also draw its speed torque characteristics.
(7 marks)
00
5.b.
Explain in detail the principle of working, types and applications of the reluctance motor.
(6 marks)
00
OR
6.a.
Write a short note on Universal motor.
(7 marks)
00
6.b.
Distinguish between Brushless DC motor and Conventional DC motor.
(6 marks)
00
7.a.
Write short note on servomotors.
(7 marks)
00
7.b.
Write are stepper motors? How are they classified? Plot static and dynamic characteristics of stepper motor.
(6 marks)
00
OR
8.a.
Describe the principal of operation of single phase split phase type induction motor along with its circuit and phasor diagram.
(7 marks)
00
8.b.
Write short note on stepper motors.
(6 marks)
00
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