DC motors: E.M.F.
equation, back emf of motors, torque equations, methodof excitation,
characteristics of DC shunt, series and compound motors. Speed - torque
characteristics of DC motors. Starters, principles of speed control and braking.
Three phase Induction Motors : Rotating
magnetic field, construction and principle of operation, slip, rotor frequency,
development of equivalent circuit, torque equation, maximum torque, torque-speed
characteristics, speed control, starting methods, motor ratings.
Single Phase Motors : Principles of
operation and characteristics of single phase induction motor, capacitor, shaded
pole, reluctance, hysteresis types, stepper motor.
Measuring Instruments: Principles of moving
iron, moving coil, rectifier ammeters and voltmeters, principles of dynamometer-
wattmeter and induction type energy meters, principles of p.f. meter and
frequency meter, use of current and potential transformers.
Measurement of R,L,C : Measurement of low,
medium and high resistance. Wheatstone and Kelvin bridge method. Ohm meters,
Megohm bridge and megger. AC bridge circuits for measurement of inductance,
capacitance and Q- factor. Schering Bridge.
Potentiometer : Principles of simple DC and
AC potentiometers and their applications, DC vernier potentiometer.
<<©2002 Samsoft Technologies>>