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517
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Explain All-day efficiency
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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1.8k
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Two three phase transformers rated at 500KVA and 450KVA respectively are connected in parallel to supply a load of 1000KVA at 0.8PF lagging.
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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2.5k
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Write a short note on Oscillating Neutral in three phase transformer.
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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447
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Write a short note on effect of harmonics on operation of three phase transformer.
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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536
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Explain open delta connection of transformer in detail
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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436
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0
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Describe in brief connection and phasor diagram of various vector groups along with their application in three phase transformer.
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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1.0k
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Two three phase transformers which have the same turns ratio are connected in parallel and supply a total load of 800KW at 0.8 pf lagging their ratings are as follows.
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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445
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State the different thermal classes of insulating materials. What are the desired properties of insulating materials used in electrical machines.
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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619
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What are the properties of an ideal insulating material? And state the various factors affecting the same.
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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485
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Discuss the detail classification of magnetic materials.
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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5.8k
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Derive the output equation of a three phase transformer and single phase transformer.
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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2.2k
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Calculate the overall dimensions of a 250KVA, 6600/440V, 50Hz three phase core type transformer with data
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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500
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Describe the types of coils used in manufacturing of windings of transformers and explain where each type is used
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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5.2k
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Calculate approximate overall dimensions for a 200KVA, 6600/440 V, 50HZ, 3 phase core type transformer, The following data may be assumed;
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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672
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What is the role of conservator and breather in transformer.
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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1.2k
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Determine the main dimensions, number of turns and cross section of conductor
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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829
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What are the advantages of interleaving of joints and Mitred joints in transformer.
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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1.6k
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Discuss the mechanical forces developed in transformer winding.
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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1.7k
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0
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Calculate the per unit leakage reactance of a 315 KVA, 11000/440 V, 50HZ 3 phase core types transformer with data and delta star connection.
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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515
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Explain the different methods of estimating $I\mu$ in a transformer.
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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3.7k
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Calculate the active and reactive component of no load current of 400V, 50Hz, single phase transformer
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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491
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0
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With the help of neat sketches, explain different methods of cooling in case of transformer
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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0
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1.4k
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0
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What are the various assumptions in leakage reactance calculation of a core type transformer with LV and HV winding.
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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0
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829
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0
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Derive an expression for the reactance of core type transformer with cylindrical concentric coils of equal lengths in terms of mean length turn coil length
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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1.0k
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0
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Specific heat dissipation due to radiation and convection is respectively 6 and $6.5 W/m^{20}C$. Assume that convection is improved by 35% due to provision of tubes.
electrical machines updated 2.1 years ago by RakeshBhuse • 3.2k
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