Fundamental Electrical and Electronic Principles, Third Edition

196 Fundamental Electrical and Electronic PrinciplesSuggested Practical Assignments10 Vp.s.u0VFig. 5.463 Tabulate both voltmeter readings. Plot graphs (on the same axes) for thevoltage readings versus angular displacement.4 Determine the percentage loading error of the AVO, for displacements of 0°,180°, and 270°. Write an assignment report, and include comment regardingthe variation of loading error found.Assignment 4Apparatus:Method:Assignment 5Apparatus:Method:To demonstrate mutual inductance and coupling coefficient.Several coils, having different numbers of turns.Ferromagnet core1 galvo1 d.c. psu1 Place the two coils as close together as possible. Connect the galvo to onecoil, and connect the other coil to the psu via a switch.2 Close the switch, and note the deflection obtained on the galvo.3 Repeat this procedure for increasing distances of separation, and fordifferent coils.4 Mount two of the coils on a common magnetic core, and repeat the procedure.5 Write an assignment report, explaining the results observed.To determine the relationship between turns ratio and voltage ratio for a simpletransformer.Either 1 single-phase transformer with tappings on both windings;or Several different coils with a ferromagnetic core.Either a low voltage a.c. supply;or 1 a.c. signal generator.1 DVM (a.c. voltage ranges)1 Connect the primary to the a.c. source.2 Measure both primary and secondary voltages, and note the correspondingnumber of turns on each winding.3 Vary the number of turns on each winding, and note the correspondingvalues of the primary and secondary voltages.4 Tabulate all results. Write a brief report, explaining your findings.