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how to select overload-relay for perticular motor 1.for D.O.L. starter 2. for Star-delta starter ????
2787does the Trivector Meter of three phase automatically takes care of the low power factor and gives the reading accordigly or it does not take care of the Power factor while giving the readings please explain
1858What effect of supplying stationary generator (800kVA) with 415V AC from 1500kVA transformer?
2 4523What will be the impact on motor performance if a LT motor is rewound with changed motor winding data as given below:- Original winding data: total 04 wires = 02 wires of 17 SWG + 02 wires of 16.5 SWG. Changed Winding data: total 03 wires of 15.5 SWG wire size Motor rating: 160KW, 740RPM, 415V, ID FAN application. Normal Running Current = 95% of FL Current.
NFL,
1969The metal-enclosed switchgear and controlgear is subdivided into three types: 1. metal-clad switchgear and controlgear; 2. compartmented switchgear and controlgear 3. cubicle switchgear and controlgear. What is the main differnence between them. State some example.
1911Post New Electrical Engineering Questions
A commercial Building is designed with 14th floor levels with indoor substation of three phase transformer with rated capacity of 1000 Kva.The transformer delivered 65% of its rated capacity at 0.67 power factor lagging.Because of low power factor, the power customer was penalized and certain cost was charged accordingly based on every point percentage lower than 85%.This situation may repeatedly happen on the succeding energy bills of power customer.The power customer is desired to improve its historical power factor of 0.67 lagging and no further penalty be impose by the local power company on the next bill. Q: Identify the appropriate solution you want to offer to Client?.Justify SCIENTIFICALLY and MATHEMATICALLY the principles behind the solution.
what are inherent currents?
what is the meaning of WYE and DELTA in Electric meter?
What is an iron loss or core loss pi?
Draw the single line diagram of the power station?
What is the function of NGR for the parallel operation of alternator? whats happen when different rating of alternator are running with parallel?
In cable sizing calculation (determining the max route length of cable) why we choose the shortest length between cable length of full load current Iflc & starting current Istart?
The power supplied to a 50mH inductor from a 120V, 60Hz source will be
Write down the name of 2 lady Bir Pratin of Bangladesh
Determine the BTU size of an aircon for 20 sq metre room
ratings of lightning arrester
Differentiate between Zero and Negative sequence current
derive DC RMS value for half wave rectifier?
Why we use 4-20 mA Analog signal for the PLC input? Why not 0-20 mA? Why not 5-25 mA?
Why do you have to use Protecion relay with the function MTB ( Mechanical Trip Button ) for electrical system.
