why 3 phase motors are preferable over single phase motors ?

Answer Posted / rabi

KW/Kg is more for 3 phase motor than single phase motor of
same rating. also there is no need of starting winding for
creating RMF in 3-phase induction motor.

Is This Answer Correct ?    3 Yes 1 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

I am having a 42KW 3 phase electrical heating furnace, heating element is 80/20 nichrome material, my connections is made in such a way that 2 star connection compromising 2 coils per phase so totally 12 coils, shall if i use it unbalanced star condition (instead of 2 group of 3 phase or 1 group of 3 phase, connecting 4 phases of 5 phases) what will be the consequences and is it acceptable?

1260


mccb service sittings be done?

1421


new 90kw motor installed so how I purchased cable ,fuse,etc please give me technic for cable selected why always capacitor delta connection

1359


how generator load test is conducted?what are the steps?

1137


who invented active elements? plz give me the complte details of active elements...

1415






What is mean by hot and cold loop testing? What is the difference between them?

603


why the name trunking bus PT

2488


Can anybody tell abt concrete encased earthing or grounding?

1617


what is Different between Bilinear and Unilenier?

1649


What happen when change order of CT in GIS feeder?

1180


Why does the rotor rotate?

1808


sir i ve applied for hindustan petroleum and power grid india ltd..and the exams on feb 22.can you pls send model papers and tell how to prepare for those.i need to get into any of these for sure.....

1743


what is different between phase and netural

1500


Why in ESP Positive earthed

2564


7- What is the Dissipation Factor and the difference between it and Insulation Resistance Test? 8- What is the task (function) of DC and AC reactors in power plant? 9- What is the task (function) of (open delta with earthed) in some types in transformers? 10- What is the base of the selection of the vector group in transformers? 11- What is the zig-zag transformer and its function by drawing in large detail? 12- What is the polarity ? 13- Why we make short between phase(R) in high side and phase (r) in low side in vector group test? Where High Side ( R ,S and T ) and Low Side ( r ,s and t ). 14- What are the time on delay and time off delay? 15- What is the vector group? 15- What is the task (function) of different types of vector group such as Dyn11 , Dd0 , YNd1,……..,?

1775