In d.c. machine iron losses occur in
WebMechanical losses can be occurred due to the effects of the machines. These losses are separated into two losses namely bearing friction & windage. These kinds of losses can … WebElectrical Engineering questions and answers. 8) 8) Iron losses occur in the armature of a DC machine. A) True B) False 9) 9) A DC motor running at no load develops no useful power. A) True B) False 10) 10) At no load, the 12 losses in a DC motor are the greatest because the no-load current is so much higher than the full-load current.
In d.c. machine iron losses occur in
Did you know?
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? ... WebFeb 26, 2024 · The losses that occur in a DC Machine are divided into five basic categories. Electrical or Copper losses (I2R losses): The copper losses are the winding losses taking place during the current flowing through the winding. These losses occur due to the resistance in the winding.
Web(a) List any four (4) types of losses that occur in DC machines. (4 marks) (b) A 240 V, 1500 rpm DC shunt motor draws a current of 65 A during half load operation. The rotational losses are 1500 W at rated power output. The armature circuit resistances are given as 0.05Ω and 120Ω, respectively.(i) Calculate the efficiency and torque of the motor under … WebJan 22, 2024 · In the DC motor, iron losses occur in armature because the armature core is made of iron and it rotates in a magnetic field. Hence a small current gets induced in the …
WebJan 22, 2024 · In the DC motor, iron losses occur in armature because the armature core is made of iron and it rotates in a magnetic field. Hence a small current gets induced in the core. Due to this current, eddy current losses and … 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.
WebOct 23, 2024 · Although it is well known that the magnetic properties of electrical steel can be deeply affected by the cutting process, it is still not clear how to accurately evaluate these effects on a prototyped machine on its final shape, especially at a high frequency or a high power rating. This research provides a more practical method for accurate measurement …
WebSep 13, 2024 · The present invention discloses a cooling system (4) for outrunner brushless DC motor (1) which includes a radial heat transfer element (41) having a plurality of fins (413) on its outer surface where the radial heat transfer element (41) is fitted in the stator core (21) to extract heat from the stator (2). The heat from the radial heat transfer … t shirt angronphilosopher\\u0027s vyWebSep 26, 2016 · Mechanical losses are divided into bearing, friction loss and windage loss. The losses occurring in moving parts of the machine and the air present in the machine … t shirt anglerMechanical 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 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 … See more The armature core of DC machine is subjected to magnetic field reversal when it passes under successive poles. An energy loss takes … 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 … See more philosopher\\u0027s vtWebIn a DC machine, the losses are broadly classified into four types: Copper Loss Copper loss takes place when the current flows through the winding. These losses occur due to the resistance in the winding. The copper loss … philosopher\u0027s vuWebThe losses in the DC machine are as follows: #1. Electrical or Copper Losses in DC Machine: Electrical or copper losses occur in stator windings and armature windings in DC … philosopher\\u0027s vwWebIn a dc machine mechanical losses occur due to (a) air resistance of rotation to armature and fan. (b) brush friction. (c) bearing friction. (d) all of the above. SHOW ANSWER 17. In a dc machine, mechanical losses are primarily function of (a) voltage. (b) current. (c) speed. (d) none of these. SHOW ANSWER 18. t shirt angel wings