Measuring InstrumentsPrinciple of Permanent Magnet Moving Coil (PMMC), Moving Iron Instruments, Ammeters a Voltmeters, Operating Principles of the Electrodynamometer Instruments. Wattmeter, Energy meter, Electrostatic Instruments, Rectifier type Instruments, Extension of Ranges of Voltmeters and Ammeters. Principle of Power Factor a Frequency meter. Use of Current a Potential Transformers. Measurement of R, L, and CMeasurement of low, medium a high resistances Wheatstone a Kelvin bridge, Ohmmeter, Megger. A.C. bridge circuits for measurement of inductance a capacitance-Maxwell s, Hay s a Anderson s bridge, Schering bridge.PotentiometersPrinciples of D.C a A.C. Potentiometers a their applications.Magnetic Properties of MaterialsThe magnetic dipole movement, diamagnetism. The origin of permanent magnetic dipoles in matter, Paramagnetism, Ferromagnetism.D.C. MotorsPrinciples of working, E.M.F. equation, back EMF, torque equations, methods of excitation, characteristics of D.C. shunt, series a compound motors, speed torque characteristic of D.C. motors, starters, principles of speed control. Three Phase Induction MotorsRotating magnetic field, construction a principle of operation, slip, rotor frequency, development of equivalent circuit, torque equation, maximum torque, torque speed characteristics, speed control. Starting methods, motor ratings.Stepper MotorPrinciple of working, characteristics a applications.The block diagram of an open loop control system is shown in the Fig. 7.14 Fig. 7. 14 Open loop system ... Similarly traffic light controller controls the lamps in proper sequence for the time set using the relays. The traffic passing has no effect onanbsp;...

Title | : | Electrical Machines And Instruments |

Author | : | A.V.Bakshi U.A.Bakshi |

Publisher | : | Technical Publications - 2007-01-01 |

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