1.Why sinle phase motor is not self starting
2.working principle of alternator
4.list out electrical formula
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Answer / kumar
1.Single phase as produces impulsative
magnetic field, butany motor rotate to be
rotating magnetic field. Rotating
magnetic field creates minimum two
phases.
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Answer / kumar
2. Faraday's law's of electro magnetic induction.
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Why LVDT have secondary windings connected in differential 1. Higher out put 2. Based on the out put voltage-/+, helps to identify the direction of displacement 3. To establish a null/ reference point
why we using capacitor in single phase motor ?
what is a diffrence between MCCB, RCCB, MCB, & ELCB ? what is rated current e.g. on motor name plate indicated that is rated curent? what is full load current? If we run D.C. motor with mechanical coupling and we measure voltage on terminal it shows voltage or not ? same in AC also possible ?
what is the application of dynamic Breaking resistor in inverter ? & How it works ?
what is recommended breakdown voltage of transformer oil?
In a incandescent bulb, if the glass is punctured, and then power is supplied, the tungsten filament blows up with a flash.Why?
Is any AC drive(VFD) had a feature of DC injection braking? if available please mention the detail. i.e drive can supply braking torque when the motor in idle state.
Regarding units, for voltage we are denoting Volts as V but in case of current we are not denoting Ampere as A instead as I..Why..? Any technical reason for this..?
how the rotating magnetic fieldis produced in induction machines??? give the correct explanation.is there any mathematical expression for the same?
what type of motor is used in washing machine
who can measure the size of power cable?
what is the difference between CT and CVT in EHV Sub Stations
4 Answers Hofincons, Lanco, TATA,