Answer / sunil pargania

inverter convert DC in to AC, but not pure AC some DC
component remain left in inverter's output volt. so due to
this DC component fan give the noise.

Answer / raxit

Inverter output contains harmonics and THD of inverter is also high that detract motor performance.

Answer / vinodkumarkkp

When dc to ac is converted , it is 12 v ac and t/f step up and due to this t/f does not step upto 220 v ,i.e. Nearby 220 v it is stepped up . But fans are not working properly below 220 volts a.c. I think this is also a reason.

Answer / abhishek singh

capacitor ckts are present in invertours which converts dc
to ac current because capacitor does not passes dc
current.but all dc current are not able to filtered
through inverter some remains present in the current which
causes a sound in fan.

Answer / dhaval

when we connect a celling fan with jenreter then pure
voltage like 240v is not provided fan even thogh it produse
some noise

why the iron chains were hanged at the back or front of the trucks earlier which were touching the earth?

2 Answers  

(1)For 3 No 1500 KVA transformer require on one single bus bar or need to be section through bus coupler means upto 3MVA.(2) 22KV Net work system as ring, How maney I/C required or 0ne I/C and one O/G.(3) What should be rating of VCB for 22 KV line.(4)Electrical/mechanical inter lock, why we need.

0 Answers  

Explain the advantages of the wheatstone bridge method of measuring resistance?

7 Answers  

WE HAVE A PROBLEM THAT THE MAIN DRIVE OF OUR CEMENT MILL HAS AN EARTHING PROBLEM?TWO OF STATOR WINDINGS INSULATION HAS BEEN COLLAPSED DUE TO AGING PROBLEM.THE PHASES HAVE BEEN BYPASSED AND NOW THE LOAD HAS BEEN INCREASED.WE CAN'T REPLACE THE MOTOR.KINDLY HELP ME BY GIVING SUGGESTION THAT HOW TO MAINTAIN THE STARTING TORQUE AND CURRENT FOR HIGH LOADS.

1 Answers   ACC,

can any one help me out by posting something related to rvnl interview for site engineer electrical.? what is the procedure? what kinda question they ask us? how long the interview goes? and any tips? and any thing you want to share?

0 Answers  

Lux meter is the measuring device to measure the lux level of lighting fixture. in industrial sector two types of lighting fixture is being used as street lighting purpose 1. HPSV (Sodium) and 2. HPMV (Mercury). HPMV having white light which is an combination of red, blue and yellow colour, while HPSV haivng Yellow lighting. in HPSV red & blue colour will be absent. during measurement of the lux level of HPSV and HPMV fixture. 1. Lux meter can measure the actual lux level of both fixture? 2. or it will show false reading for HPSV fixture light as it has only yellow light present. please give me answer

1 Answers  

I am going to appear for the RRB Chennai junior Engineer online exam. Please send me the previous exams question papers (also solved) to my mail id: rrkhandhar@yahoo.com

0 Answers  

what is the multi strand cable size? 0.45mm is area of one strand & 370nos of strand.

1 Answers  

Resistance of low voltage side of transformer compared to high voltage side is A less B equal C more D depens on design

1 Answers  

how calculate the electrical load for industry and office

2 Answers  

tell me working of air circuit braker.

2 Answers  

what is the sweep commenly used 1200mm sweep and 600mmsweep please tell me breifly sweep

1 Answers   Khaitan,