Answer / narayanan.m

due to high starting torque

Answer / kj

With an induction motor the speed is dependant on the
frequency and is the same as the frequency minus slip. For
a 4 pole motor this is about 1440 to 1460 RPM.
It does not depend on the voltage. The torque is dependant
on the voltage.
A 400 volt motor supplied at 250 volts would not have
anywhere the power output.

shall we use a machine having 60Hz frequency in india ? why?

4 Answers  

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what is the effect of vector group while phase sequence of a generator changes,whether the vector group changes or not

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A 50Hz,4-pole,3-phase,star-connected synchronous motor has a synchronous reactance of 12ohmsper phase and negligible armature resistances.the excitation is such as to give an open-circuit voltage of 13.2kilovolt.the motor is connected to 115kilovolt, 50hertz supplying. what maximum load can be the motor torque,line current and power factor?

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technically, what is the reason behind starting the motor star the delta connection .. and what other ways to do this rather than using " star-delta transformer"

0 Answers   Wipro,

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why the name mho relay,despite the locus of circle is impedance?

1 Answers   KSEB,

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2 Answers  

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why does the magnetic balance tests at transformers? how to provide earthing in flight?

1 Answers  

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why hv winding is not placed near to transformer core

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What is the function of UV coil ACB?

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a solar energy installation utilizes a three phase bridge converter to feed energy into power system through a transformer of 400v/400v.the energy is collected in a bank of 400v battery and is connected to converter through a large filter choke of resistance 10ohms.1.the maximum current through the battrey will be.2.the kva rating of the input transformer is.

1 Answers   GATE,

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