Answer / jitu mahapatra

A single phase fan has two windings but unless there is a
phase difference between the two winding current there
cannot be a rotating flux and there fore wthe fan will not
be able to start.

Answer / u.v.v.satyanarayana

ofcours,RMS(rotatory magnetic field) can developed by min 2
phases,and also powerfactor improment.

Answer / abhishek-gaur

fans used in our household... are singl phas inductn motor
which needs a revovng flux to b produced ... this revovlvng
flux is producd by splitting phase of single phas supply
into two... as capacitor has leadng power factr.

one can use inductr for splitting phase...

but practically never done... bcoz of its lagging pf
nd lagging pf wilhav severe effect on efficiency of fan

Answer / bhabani pattanayak

As the fan is single ph. It is
not self started. So it is used
for starting & running
purpose.

what is the principle of singkle phase energy meter?

3 Answers  

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i have seen one 8.4 MW synchronous motor in a plant located in bellary it is fixed with brushless rotary rectifier ,anybody can explain its start up principle

0 Answers  

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800a siemens vcb in our company can not be closed electrcally an mechanicaly cc and oc coils are found ok. why?

2 Answers  

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why the altrnator(AVR) not showing the any voltage after making the new winding and insulation?

1 Answers   Avon,

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We have one Energy meter for Measuring the voltage,current,power,energy(KWH,KVARH,KVAH) & power factor.The problem is that the meter does not show whether the PF is lagging or leading.So i want to know that is there any way or calculation to find out that whether the PF sign (lagging or leading) depending upon the above mentioned parameters?

4 Answers  

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why Ac current is alternating in nature?(or)why alternating current changes its direction?

3 Answers   APGenco,

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Define open loop control system.

0 Answers  

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what is the use of cable in our environment ?

0 Answers  

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operation of diesel generator

0 Answers  

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16kv transformeris stolen in my village.and department is not taking action.then what should i do.any shortcut .please help any idea

1 Answers  

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During he starting up of the motor, the upstream's MCCB (350A) always trips due to the UVT relay activated. Can Star-delta starter use for a 20kW Motor (For a powder mixer machine) cause voltage-dip in the supply line voltage? If so, what are the recommended solution to eliminate/reduce the transient voltage dip in the line voltage?

4 Answers  

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what is motor

6 Answers   HBL Power Systems,

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