If you're a student studying electrical engineering, then you know how challenging it can be to keep up with all the coursework, exams, and assignments. Electrical Machine 1 is a course that covers the principles of electrical machines, and it's an important subject for anyone looking to pursue a career in electrical engineering.
As the Insem exams approach, it's essential to have a clear idea of what kind of questions to expect and how to prepare for them. To help you with that, Mypractically is providing a comprehensive guide to Electrical Machine 1 Insem Exam Important Questions and Solutions.
Here are some of the critical topics that you should focus on while preparing for the Electrical Machine 1 Insem Exam:
Unit 01 Single Phase Transformers
1. With neat cireuit diagrams, explain open circuit and short circuit tests on a single phase transformer for finding the voltage regulation d efficiency
2. Sketch and explain phasor diagram for I-phase transformer at ON Load.
3. Compare the two winding transformer with autotransformer
4. Comment on various losses taking place in transformer
5. 20 kVA, 440/220 V, 1-ph,transformer has full load iron lossof 400 W and half load copper loss 120 W. Calculate:
(1) Efficiency at full load and p.f=0.75 lagging. (ii) kVA loading at maximum efficiency.
6.With neat connection diagram,explain the procedure to conduct O.C and S.C.test on 1-ph transformer to obtain voltage regulationand efficiency.
7.20 kVA 440/220 V,50 Ilz,1-phase transformer has coreloss of 324 W and copper loss of 100 W at half load.Calculate:
(i)kVA loading for max Efficiency.
(ii) Maximum efficiency at p.f.=0.8 lag.
8. Draw equivalent circuit of transformer referred to primary side. Explain all the parameters involved in the equivalent circuit.
9. With suitable diagram explain constructional details of welding transformer.
10.With suitable phasor diagram explain wye/delta connection and delta/wye connection for 3-phase transformer. Clearly mark the angular displacement in respective phasor diagram.
11. Open circuit test and short circuit test is carried out on asingle phase, 230/500volt,25 kVA transformer. The observations are as below: Open circuit test: (With HV winding open)230Volt, 5 Amp, 200 Watt Short circuit test:(With HV winding shorted) 6 Volt,100 Amp,180 Watt. Find the parameters of equivalent circuit referred to LV side.
12. Problems on Determine all day efliciency Do by own
13. Define voltage regulation of transformer Describe the effect of power factor on veltage regulation of transformer.
Unit 02 Three Phase Transformers
1. With neat circuit diagram, explain the Scott connection of transformers to convert 3 phase supply into 2 phases Supply.
2.State and explain the conditions to be satisfied for parallel Operation of I-phase transformers.
3. State and explain standard connections of 3-phase transformer.Write one application of each.
4. With neat circuit diagram, explain the V-V connection of transformers. State its merits and demerits.
5.Explain V-V connection of transformers and obtain relation between V-V capacity and delta-delta capacity.
6.What is the necessity of parallel operation of transformers? State and explain conditions tobe satisfied for parallel operation of transformers.
7.Draw circuit diagram and phasor diagram of 3-phase star-star connected transformer Explain it in brief.
8. With suitable phasor diagram explain wye/delta connection and delta/wye connection for 3-phase transformer.Clearly mark the angular displacement in ective phasor diagram.
In conclusion, mastering the concepts related to Electrical Machine 1 is essential if you want to perform well in the Insem Exam. By focusing on the critical topics mentioned above, you'll be able to answer both theoretical and numerical questions with ease. To further aid your preparation, Mypractically provides the solutions to the important questions to help you in your revision process. Good luck!
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