Problems with Answer
Subject and UNIT: Probability and complex function: Unit I: Probability and random variables
Probability and complex function: Unit I: Probability and random variables : Exercises 1.1
Theorem, Proof, Solved Example Problems
Subject and UNIT: Probability and complex function: Unit I: Probability and random variables
The probability of an event has been defined, we can collect the assumptions that we have made concerning probabilities into a set of axioms that the probabilities in any random experiment must satisfy.
Subject and UNIT: Probability and complex function: Unit I: Probability and random variables
In the study of probability, any process of observation is referred to as an experiment. The results of an observation are called the outcomes of the experiment.
Introduction
Subject and UNIT: Probability and complex function: Unit I: Probability and random variables
The theory of probability had its origin in gambling and games of chance. It owes much to the curiosity of gamblers who prestered their friends in the mathematical world with all sorts of questions. Unfortunately, this association with gambling leads to very slow and sporadic growth of probability theory as a mathematical discipline.
Electrical Machines
Subject and UNIT: Electrical Machines: Solved model Question Paper
Electrical Machines: Solved model Question Paper
Autotransformer and Three Phase Transformer | Electrical Machines
Subject and UNIT: Electrical Machines: Unit V: Autotransformer and Three Phase Transformer
Electrical Machines: Unit V: Autotransformer and Three Phase Transformer : Two Marks Questions with Answers
Transformer
Subject and UNIT: Electrical Machines: Unit V: Autotransformer and Three Phase Transformer
• With the help of Scott connection, proposed by C.F. Scott, it is possible to obtain 2 phase supply which is required for furnaces or even three phase load can be driven from the available 2 phase supply source. The Scott connection which is serving this purpose is shown in the Fig. 7.6.1.
Three Phase Transformer
Subject and UNIT: Electrical Machines: Unit V: Autotransformer and Three Phase Transformer
• In the three phase transformers, the phase voltage ratio is same as the turns ratio. But due to the different types of connections the ratio of line voltages is different. The relationships between voltages and currents for various types of connections is given in the Table 7.5.1.
Subject and UNIT: Electrical Machines: Unit V: Autotransformer and Three Phase Transformer
• The primary and secondary windings of three phase transformers as three phase windings can be connected in different ways such as in star or in delta. With suitable connection the voltage can be raised or lowered.
Subject and UNIT: Electrical Machines: Unit V: Autotransformer and Three Phase Transformer
• The three phase transformers can be core type or shell type. The three core type single phase transformers can be combined to get three phase core type transformers. Similarly three single phase shell type transformers can be combined together to form a three phase shell type transformer
Subject and UNIT: Electrical Machines: Unit V: Autotransformer and Three Phase Transformer
At the time of distribution it is necessary to reduce the voltage level upto 6600 V, 440 V, 230 V etc. For which step down three phase transformers are essential. Thus three phase transformers proves to be economical in transmission and utilization of electrical energy.
Construction, Transformation Ratio, Power Transfer, VA Rating, Advantages, Limitations, Applications, Equivalent Circuit, Solved Example Problems
Subject and UNIT: Electrical Machines: Unit V: Autotransformer and Three Phase Transformer
• Uptill now the two winding transformers are discussed in which the windings are electrically isolated and the e.m.f. in secondary gets induced due to induction. In practice, it is possible to use only one winding for the transformer so that part of this winding is common to the primary and secondary.