Answer / vinod

When three phase voltage is applyed across the stator a
flux with syn speed will be rotated inside the stator, as
the rotar is stationatory max, voltage will be induced and
high startin current is drawn.

Answer / jayaram

iniatially the motor don't have any backemf so motor draw
high current at the starting stage. whenever motor is
started it generates backemf so motor takes normal load
current.

Answer / sanjana singh

in starting motor resistance is negligible.so according to formula-
I=v/Ra ( Ra can be neglected)
then I=V ( Starting current is equal to supply voltage)
so to start motor starter is used. it add resistance in series of motor by this starting current limit to safe value & motor start safely...

Is there any problem ,if R-Y-B voltage is constant , but the air compressor taking one phase high current.what is possible causes.the said compressor is very new.(55kw).

4 Answers  

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415v 14kw so can u tell me how i can measure the cable size.then size of the earth also

1 Answers  

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how kva rating of transformer is calculated.

6 Answers   Fluor Daniel, Siemens,

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our factory is going under construction mean time transformer 1000 kva 2 nos &load break swithch 12 kv & 4 nos 750 kva 2 nos & 380 kva 2 nos generator to be errcted.how to arrange earth pits &how to earth connect & neutral pit how to calculate in earth bit size.

0 Answers  

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Do these factors (settling time, peak time, steady state error, overshoot, rise time, MPOS (Maximum percent over shoot)) are the part of first order, second order, higher order, linear, non-linear, open-loop, closed-loop, homogeneous & non-homogeneous systems ?

1 Answers   Limton,

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why ahould you show client/engineer activities clearly on the project plan

0 Answers  

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IN star -delta motors normally first operated in star mode {absulated given (r-y-b) phases after one miute change in delta mode in this case i am change phase sequience for example R -PHASE TO CHANGE Y-PHASE ;Y-PHASE TO CHANGE R-PHASE SO THIS TIME MOTOR WILL HAPPEN RUNNIG MODE EIGHTER(OR) STOP MODE(TRIP MODE)

6 Answers   MacLellan,

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What is the Diference between DYN 11 and DYN 5 .How to change the Vector group from DYN 11 to DYN 5.

3 Answers  

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Why DG set is not installed in Terrace ??

0 Answers  

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resistance switching is used in case of- ? a. air blast CB b. bulk oil CB c. minimum oil CB d. all types of CB

4 Answers   HCL, SSC,

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c++ write a program to use a fuction call "max"which accepts an intger arrey of size5.as an arrument and return the larger and smallest of the arrey to main without changing. the original changing of the original position of the element of the arrey.

0 Answers  

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How we calculate the size of ht cable for any transformer

0 Answers   WalMart,

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