Syllabus_Continuous Evaluation_ 5TH SEM_Electrical Machines – II _(3150910)_quiz_3_(24/08/2020)

 

GOVERNMENT ENGINEERING COLLEGE, BHARUCH

ELECTRICAL ENGINEERING DEPARTMENT

B.E. 5th Semester: 2020

QUIZ-3 SYLLABUS (Continuous Evaluation)

SUB: Electrical Machines – II (3150910)

 

 1. Induction Machines:

    Construction, types of induction motor (squirrel cage and slip-ring), concept of rotating magnetic field, working principle, Slip, Frequency of Rotor Current, Relation Between Torque and Rotor Power Factor, Starting Torque, Starting Torque of a Squirrel-cage Motor, Starting Torque of a Slip-ring Motor, Condition for Maximum Starting Torque, Effect of Change in Supply Voltage on Starting Torque, Rotor E.M.F. and Reactance Under Running Conditions, Torque Under Running Conditions, Torque-speed characteristic  of an induction motor,Power Stages in an Induction Motor, Torque, Mechanical Power and Rotor Output, Induction Motor as a Generalized Transformer, Equivalent circuit. Phasor Diagram, Losses and Efficiency.

2. Alternators:

   Constructional features, cylindrical rotor synchronous machine generated EMF, equivalent circuit and phasor diagram, armature reaction, synchronous impedance, voltage regulation. Methods to find voltage regulation: Synchronous impedance method method & ZPF method, synchronous of alternators.