Answer / bhavesh n r

First of all pls ensure that if overload relay is tripped or
not.then check motor winding resistance & insulation
resistance of winding with body.then check motor shoud
rotate freely without jerk.if u any query then pls mail me @
aundal.bhavesh@yahoo.com

Answer / shivakumar

Control wiring also problem, interlock working are not working,when feed are not com feeder automatically stopped

how we can calculate power factor in single phase & three phase ?thank u

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What is difference between ON delay and OFF Delay Timer?

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If the (Motor control center)Panel work on field the relay used in panel in the case this will be damage and no indication provide on panel.fault occur in panel and MCB will not trip. how happen the relay damage in panel and what effect of panel.

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When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<

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What is the voltage gain or transfer function of amplifier?

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How big (size) can the tertiary winding be in transformer? Can we load the tertiary winding, if yes then how much we can load it?

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which frequency is to be selected for measuring earth resistivity

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How should i design a 1ph & 3 ph transformer. Kindly let meknow all steps and formulaes related to design from scratch.

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1. what is the meaning of bus? 2. what is the dc transformer? How it work 3.what is the function of the serge absorber? 4.How the CT and PT rating calculate/

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