Answer Posted / v.selvakumar

n=emf/flux according to this formula field open means flux
will be zero.flux zero means speed will be infinity,but we
know that no machine can't reach infinite speed.so that
therotically ok but practically starting speed will
increase then it will reduced zero.

how we can decide that what value of ht line will come to any commercial building? (ans except According to the building load)

1636

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difference between Ac and Dc mcb ????

1610

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Whether power factor should be high or low? Why?

1102

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Thumb rule of cable size(rm>30 rm)X multiplying factor=ampere

1598

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explain working principle of earth leakage relay

3684

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What are the material used for resistor?

1093

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What will happend if given Vfd out put to step up transformer

1793

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Define gain margin?

1164

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3 shows a 415 V, 3-phase generator supplying a 3-phase 415/110 V transformer. Draw the individual and combined impedance diagrams to a base of 10 kVA. Determine the system fault kVA and the fault currents at the 415 V and 110 V busbars for short circuit faults on the transformer input or output terminals. Work in p.u. values of impedances.

2645

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how brushed dc motor operating ?

1866

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Why does the speed regulating system adopting I controller have no steady-state error? In this single closed-loop speed regulating system, when the input of the I controller Un=0, what is the output voltage of the regulator? What factors do the output voltage depend on?

1848

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I need the recommended size for a 3 phase transformer at 13.8 KV Primary and connected loads of 3000 kVA at 4200 volts and 2375 kVA @ 480 volts AC.

2001

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Why should we hire you over the others waiting to be interview?

2821

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what is the purpose of using filters in a protective relaying scheme?

2253

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In a large office how do we calculate required number of light fittings, assuming fittings are 4x18W or 2x36W fluorescent fitting ?

1856

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