In siemens S7-300 PLC, what is function and function block ? What is the difference between them ? When to use function and when to use function block ?

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how the arcing is made in ac electric arc furnace? ( between the three electrodes in any sequences or between the electrode & the charge(steel))

1 Answers  

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List out the the types of Mounting Light fixture?

0 Answers   HLL,

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We have .ht motor which is 60Hz.we run on 50Hz.so that it's speed reduce but we had one prob.that motor winding temp increase up to 135 deg.we want reduce this temp.what to do?we arrange ext.cooling fan but not much effect.we want reduce this temp. Inhouse without affecting much.cost. also don't want reWINDING OF MOTOR?

3 Answers  

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I HAVE BEEN SELECTED FOR APGENCO A.E(ELECTRICAL) 2008.HOW MUCH WEIGHTAGE FOR INTERVIEW AND WRITTEN TEST.HOW I HAVE TO PREPARE. PLEASE GIVE INFORMATION IF U KNOW.WHAT ABT G.D THIS TIME.CALL RATIO 1:2

0 Answers  

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We use MCCB not MCB for motor starters because MCCBs has capablity to drawout the motor starting current which is 5-6 times the full load current of motor for 1sec. Then why we use SDF in starter panel means MCC panels. Pls reply if any one knows this answer.

1 Answers  

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How test for Ddo vector group test condition?

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How to calculate KW saving for power factor correction from 0.92 to 0.98 at 350KW load?

5 Answers   Heidelberge Cement,

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what is diffrence between primary & secondry transformer?

3 Answers  

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In CT, burden is 15 VA and protection 5P20,CT ratio is 100:1 then what would be the knee point voltage ?

2 Answers   ERL,

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what is the purpose of shading ring or shading coil in electrical equipments.

0 Answers   BARC,

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HOW TO REDUCE POWER PLANT AUXILIARY POWER CONSUMPTION?

0 Answers   TATA,

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