Mechanical lossesoccur in the moving parts of the DC machine due to friction and windage. These losses are also called rotational losses. The mechanical losses depend upon the speed of the machine. In a DC machine, two types mechanical losses occur, which are as follows 1. Friction Loss– such as … See more The iron lossesoccur in the armature core of the DC machine since the armature core is subjected to the magnetic field reversal i.e. changing magnetic field. The core losses are of two … See more When the armature of DC machine rotates in the magnetic field produced by the poles, an emf is induced in the core and due to this induced emf, eddy currents are circulated in the armature core. The power loss due to these … See more The armature core of DC machine is subjected to magnetic field reversal when it passes under successive poles. An energy loss takes place due to molecular friction in the material … See more The copper lossesin a DC machine occur in the various windings of the machine due to currents flowing in them. In a typical DC machine, following copper losses occur ArmatureCopperLoss=Ia2Ra SeriesFieldCopperLoss=Ise2Rse … See more WebIn the DC motor the iron losses occur in _____ Field Rotor Brushes Commutator. dc machines Objective type Questions and Answers. ... Nature of efficiency curve of DC machine is _____ Hopkinson’s test requires _____ In retardation test _____ What is the purpose of performing retardation test after Swinburne’s test? ...
[Solved] In the DC motor, iron losses occur in - Testbook
WebMar 8, 2024 · In a DC generator, the iron losses mainly take place in ________ Yoke Commutator Armature conductors Armature rotor Show Explanation 6. A DC generator delivers a 30-A current to a load at 120 V by consuming 4500 J/s of mechanical energy. Determine the efficiency of the generator. 90% 85% 75% Show Explanation 7. WebMay 13, 2024 · The losses in a d.c. machine (generator or motor) may be divided into three classes viz (i)Copper losses (ii) Iron or core losses and (iii) Mechanical losses. All these … trump new hampshire speech
Losses in dc shunt machine - SlideShare
WebThe hysteresis loss in a DC machine least depends on _____ In the DC motor the iron losses occur in _____ For carrying out load test on Hopkinson’s test setup _____ Why retardation test is carried on DC machine? In order to run motor on rated speed while carrying out Swinburne’s test we add _____ ... WebMar 20, 2013 · As iron core of the armature is rotating in magnetic field, some losses occurs in the core which is called core losses. Normally, machines are operated with constant … WebA good DC motor is that with fewer amounts of losses and better efficiency. There are some losses that occur in a DC motor during the power conversion which can be classified as follows. Electrical Losses = Copper … trump new hat design