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what is Insulation monitoring device. where it is used? (in switchgear room or control panel or in field equipment)
2115by using pump duty, how we will can calculate the motor duty(KW)? is there any standard or formula.
HP,
1939why most of junction box vendors providing T5/T6 Temp class jb's for T3 area any special reason?
2061what will be the motor terminal box connection arrangement (star or delta). on what basis it decided?
3 9094what happens if the phase sequence of parrlel connected sys will changed & phase displacement
1 3600What is the actual formula for transformer short circuit test? below i given rating of the transformer.. 1000KVA, pri 11KV, Pri amp 56A. %Z 5.95..
2 6134why cant we use earth as neutral at home whereas neutral is actually grounded at transformer end?
4 7628when a airgap of the induction motor gets larger does it draw more current ??? does it power factor gets lower?
3 5286What is the de rating factor of cable? What is the importance of the de rating factor in cable select
2335Post New Electrical Engineering Questions
What is PQA???Applications........
what types of electrical & mechanical test conducted in switchyard?
1.why should we connect the measuring instruments in l.v side in short circuit test of a transformer? 2.why the power factor is less in open circuit test of a transformer?
Give two basic speed control scheme of dc shunt motor?
what shall be no load voltage of 132/33 kV transformer ? is it 33 kv of 34.5 kV
how to calculate
how can service sitting be setted for MCCB?Example for sittings IR (CURRENT RATING),IS(CURRENT STARTING)IO (current operating)?
1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.
What is the difference between isolators and electrical circuit breakers? What is bus-bar?
When steam condenses and becomes water at the same temperature, the specific heat for the process in kJ/kg k is
Define early construction of human being
HOW can i REuse the fused MLL LAMPS & GLS LAMPS at our factory
could anybody able 2 send me jindal steels previous papers fr electrical steam....pls send 2 my id if possible....sirisha.shaik@gmail.com
what is effect of 5amp fuse on 2mva pry protection of transformer
How to calculate the phase to phase clearness of HT /// LT bus bar?????
