Access DC Machines and Transformers imp questions 2024
Syllabus
UNIT – I
Electromechanical Energy Conversion and introduction to DC machines
Principles of electromechanical energy conversion – singly excited and multi excited systems-calculation of force and torque using the concept of co-energy.
Construction and principle of operation of DC machines – EMF equation for generator –
Excitation techniques– characteristics of DC shunt generator –applications of DC Generators
UNIT – II
Operation of DC motors
Back-emf and torque equations of dc motors – Armature reaction and commutation –
characteristics of separately-excited, shunt, series and compound motors – losses and
efficiency – applications of dc motors.
Necessity of a starter – starting by 3 point and 4-point starters.
UNIT – III
Speed Control of motors and Testing of DC Machines
Speed control by armature voltage and field control – testing of DC machines – brake test,
Swinburne’s method – principle of regenerative or Hopkinson’s method – retardation test –
field’s test- separation of losses.
Single-phase Transformers
Types and constructional details – principle of operation –emf equation – operation on no
load and on load – lagging, leading and unity power factors loads –phasor diagrams of
transformers – equivalent circuit.
UNIT – IV
Performance and testing of transformers and auto transformers:
Regulation – losses and efficiency – effect of variation of frequency and supply voltage on
losses – all day efficiency.
Tests on single phase transformers – open circuit and short circuit tests – Sumpner’s test –
separation of losses – parallel operation with equal voltage ratios – auto transformer –
equivalent circuit – comparison with two winding transformers.
UNIT – V
3-Phase Transformer: Polyphase connections- Y/Y, Y/ Δ, Δ/Y, Δ/ Δ and open Δ- third harmonics in phase voltages– three winding transformers- transients in switching –off load and on load tap changers-Scott connection.
DC Machines and Transformers imp questions 2024
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