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Dc machine consists of the following parts:
Field system: The object of the field system is to make a uniform magnetic field, within which the armature rotates. It having of four parts- yoke, pole core, pole shoe and field -coils.
Armature core: It houses the armature conductors or coils and causes them to rotate and as cuts the magnetic flux of field magnets
Commutator: The commutator is a type of rotating switch placed among the armature and external circuit and so arranged that it will reverse the link with the external circuit at the instant of every reversal of current in the armature.
Brushes and Brush gears: The function of brushes is to collect current from the commutator and supply it to the external load circuit. The brushes might be of carbon, graphite, copper, metal graphite, carbon graphite
Calculate the current needed in a 240 mm length of conductor of a d.c. motor when the conductor is situated at right-angles to the magnetic field of flux density 1.25T, if a force
Q. As-per to Coulombs Law if two charged particles are repelled with a given force at a distance d by what multiple will the force decrease by if d is increased by 4 times? An
projet on ..electromagnetic induction
Davisson-Germer experiment (C.J. Davisson, L.H. Germer; 1927) An experiment which conclusively confirmed the wave nature of electrons; diffraction patterns were observed throu
For silicon the forbidden gap is (A) 1.1ev. (B) 0.25ev. (C) 0.5ev. (D) 0.7ev. Ans: For silicon the forbidden gap is 1.1ev.
A small bucket of mass M kg is attached to a long inextensible cord of length L m. The bucket is released when the cord is in horizontal position. At its lowest point the bucket sc
Define the graded index multimode fibers intermodal dispersion specifically. In graded index fibers, the index of the core material slowly raises and turns into maximise at the
Three coils each having resistance 3 Ω and inductive reactance 4Ω are linked (i) instar and (ii) in delta to a 415V, 3-phase supply. Calculate for each connection (a)
The truss shown below supports is fastened to the supports at A & E. Each member of the truss is made of the same uniform material that has a weight in kiloNewtons per metre (kN/m
A 10.0-kg object is held up by a string that will break when the tension exceeds 1.00 x 10 2 N. At what upward acceleration will the string break?
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