What is the difference between ELCB and RCCB. Please define the working of both.6 13580
to hook up ten 50 amp rv pedastels at a lenth of 600 feet from the service what size will my service need to be and the size of wire will I have to run to each pedastel in series??????1399
CAN WE CALCULATE THE NEGATIVE SEQUENCE AND ZERO SEQUENCE REACTANCE OF A GENERATOR USING ONLY ITS RATED VOLTAGE, KW, PF AND SYNCHRONOUS REACTANCE??? IF YES, THEN HOW??4974
why we used to transmitt the power at higher voltage why not at lower voltage8 7072
why after termination of HT cable armoured earth connected one end, why not connect other end.pls tell me correct answer.3 9577
what is armature reaction?explain in simple words?and what is its infleunce on dc motor16 34001
what is the difference between torque induced and torque load?compare them with respect to dc motor?1503
what is the difference between ac and dc?which one is more efficient?and what r their advantages1 3204
what is neutral plane shift?1 8671
In Power transformer oil temperature or winding temperature will be high3 14013
what is differnt between metering CTs an protection CTs10 11431
MY QUATION IS ABT THE MAIN POWER TRANSFORMER IN STEEL PLANT , I WISH TO KNOW THAT WHY TRANSFORMER PROTECTION NOT TRIP AS CABLES ON THE SECONDAY SIDE IS WATER COOLED. TRANFORMER DETAIL NORMAL KVA--150 KVA PRIMARY VOLTAGE --34.5 KV SEC.NO-LOAD VOLTAGE---1.290-908-690V ( WITH PRIMARY DELTA CONNECTED) CONNECTION--D/d (EXTERNAL CLOSED) CONSTANT RATEING FROM--1.290-908V CONSTANT CURRENT FROM--908-690 VECTOR GROUP--D III1 2810
pls someone send me sample question papers along with the key.thanks in advance
why electric shock due to dc is dangerous than that of ac8 7716
What is different between Metering CTs and Protection CTs?4 12989
i ha done my 10th with 71% ,ITI with 81% 11th with 75% 12th 43% apprentiship with 71% in SAT i secure 1390 ,TOEFL 27 i was refused four times and in all me interview visa officar told that i am not Qualify for study in USA but i completed my 12th yes i got low persentage in my 12th but i seen to much student they already got visa with them 3 or 4 backlocs so why they are refused me ?
A 500 V shunt motor runs at its normal speed of 250rpm when the armature current is 200A. The resistance of the armature is 0.12 Ω. Calculate the speed when a resistance is inserted in the field reducing the shunt field to 80% of normal value and the armature current is 100A.
if 2 coil of 1000W connect in series and 200 v is applied across it . then what is the total power of coil when coil have only resistive load .
How to calculate total harmonic distortion level(THD) in VFD? and how can we reduce harmonics?
what is the significance of cabability curve of alternator
Why neutral point is consider as zero potential?
What are the Formula of computing Back up Time of 500kVA UPS with 4 Battery Banks, each bank composed of 43 pcs of Batteries 12V150Ah. How to compute the Back up Time of UPS? We have also 3X500kVA UPS running in Parallel same composition as I write above.
List out the different frequency domain specifications?
we have require a Motor (1500kW, 6.6kV, 50Hz) which shall operate at 1500rpm during 30min and after it shall run on 500rpm during 15min. The same cycle shall be repetitive during the whole working days. Which method is best and economic to achieve such type of task. VFD, VVFD, Pole changing motor etc.
how we select ac fuse rating of an power inverter???
1.What is captive power plant? 2.What is national grid?Give brief idea.
can u describe the method used for protection of transmission line.
What is mean by Sensitive Earth fault & what are the effects
Dear all, I just want to ask an expert on this forum for some insights. For the magnetic balance test, when applied voltage on a Delta-Star transformer e.g. Dyn11, the following relationships apply for HV side: 1. H1-H2 = H2-H3 H3-H1 2. H2-H3 = H3-H1 H1-H2 3. H3-H1 = H1-H2 H2-H3 For the LV side also: 4. X1-X0 = X2-X0 X3-X0 5. X2-X0 = X3-X0 X1-X0 6. X3-X0 = X1-X0 X2-X0 Is there a similar pattern for Y-d, Y-Y, D-d? And how about Y-z, D-z, Z-y transformers? I've tested a YNzn5 transformer and for LV side I don't see the pattern. In this particular case I got for LV side the following (see values below): H1-H0 H2-H0 H3-H0 X0-X1 X0-X2 X0-X3 128.0 119.9 7.2 29.2 13.3 15.8 70.7 128.4 59.2 23.4 22.0 3.6 7.2 120.1 128.1 13.4 29.3 15.8 What is the relationship here for LV? For row 1 I see the relationship, for row 3 I also see but it's shifted, but for row 2 I don't see such relationship. Any suggestions, answers, someone?
how the synchronizing is obtained at bus couplers in grid substation? (because there we cannot change the frequency in one of transmission lines like in generator synchronization)