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Q. Working of self - excited generators?
For self-excited generators, residual magnetism must be present in the ferromagnetic circuit of the machine in order to start the self-excitation process. For a dc generator, the relationship between steady-state generated emf Ea and the terminal voltage Vt is given by
where Ia is the armature current output, and Ra is the armature circuit resistance. For a dc motor, the relationship is given by
Vt = Ea + Ia Ra
where Ia is now the armature current input. Under steady-state conditions, volt-ampere characteristic curves are of interest for dc generators, and speed-torque characteristics are of interest for dc motors. Depending on the method of excitation of the field windings, a wide variety of operating characteristics can be obtained. These possibilities make the dc machine both versatile and adaptable for control.
Define a voltmeter A voltmeter is an instrument used to measure p.d. and must be linked in parallel with the part of the circuit whose p.d. is required.
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Q. The inductance per unit length in H/m for parallel-plate infinitely long conductors in air is given by L = µ 0 d/w = 4π×10 -7 d/w, where d and w are inmeters. Compute L (per un
Calculate the cross-sectional area, in mm 2 , of a piece of aluminium wire 100 m long and having a resistance of 2Ω. Take the resistivity of aluminium as 0.03 x 10-6 Ωm.
find Ic Vc Icsat Vcutoff
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