EMEC (B-TECH Electronics and Communication Engineering 3rd)

SECTION-A

MAGNETIC CIRCUITS AND INDUCTION:

Magnetic Circuits, Magnetic Materials and their properties, static and dynamic emfs and force on current

carrying conductor, AC operation of Magnetic Circuits, Hysteresis and Eddy current losses.

SECTION-B

DC MACHINES :

Basic theory of DC generator, brief idea of construction, emf equation, load characteristics, basic theory

of DC motor, concept of back emf, torque and power equations, load characteristics, starting and

speed control of DC motors, applications.

SECTION -C

Synchronous Machine

Constructional features, Armature winding, EMF Equation, Winding coefficients, equivalent circuit and

phasor diagram, Armature reaction, O. C. & S. C. tests, Voltage Regulation

Synchronous Motor: Starting methods, Effect of varying field current at different loads, V- Curves.

SECTION-D

Three phase Transformer & Induction Machine

Three Phase Transformer: Review of Single phase transformer. Three Phase transformer: Basics & operation

Induction Machine: Constructional features, Rotating magnetic field, Principle of operation Phasor diagram,

equivalent circuit, torque and power equations, Torque- slip characteristics, no load & blocked rotor tests,

efficiency, Induction generator & its applications. Introduction of Single phase Induction Motor,

Repulsion motor. AC Commutator Motors:Universal motor, Single phase a.c. series compensated motor,

stepper motors