Answer / balaji

In electrical regulator by using resistance the output
voltage is varied simultateneouly the speed is varied...
But to reduce the the energy loses in the resistor,
electronic regulator is introdueced,which uses triac to
vary the output voltage by varing the firing angle.Which
avoids lose of energy in resistor...

Answer / ayyappss

Conventional fan regulator works by the principleof
auto-transformer.
now in modern regulators we using triac to control i.e,by
varying the firing angle, output voltage is varied then
automatically speed can be varied

Answer / saurav

The circuit works by varying the firing angle of the Triac..
output voltage is varied then automatically speed can be varied by this..

Answer / bhanu gupta

Fan regulator working based on the principle of power control using a Triac.The circuit works by varying the firing angle of the Triac . Resistors and capacitor are associated with this. The firing angle can be varied by varying the value of any of these components. Here register is selected as the variable element . By varying the value of register the firing angle of Triac changes (in simple words, how much time should Triac conduct) changes. This directly varies the load power, since load is driven by Triac. The firing pulses are given to the gate of Triac using Diac.

Answer / nk

Electronic fan regulator is an electronic device consisting
of diacs, triacs, potentiometric resistance to provide
stepless control of fan speed. This is an energy saving
device and has advantages over the conventional type of fan
regulators having more energy losses.

These regulators can also be used as a speed regulator for
many other small F.H.P. motors used in mixer, laboratory
solution mixer etc.with appropriate current ratings.

Answer / vatsalsharda

by changing the number of turns,flux linkage changes and
thus induced emf changes

power is the product of voltage and current.so we can measure the value of power just by using ammeter and voltmeter.......then why do we use a wattmeter?

5 Answers  

i have ht transformer of 142 kva with air cooled facility,having secondary voltage 7850volt, and secondary connected full way bridge rectifier .i faced the problem repeatedly that transformer one coil and rectifier diode of two phase was burnt two times. i checked all the secondary ckt. no any short ckt found,then what will be the cause side

2 Answers   Modern Terry Towels,

How can we decide the fualt levels of sub-stations?

2 Answers   Bhel, Enercon, Prakash Industries,

How to calculate amount of copper used in a motor (AC&DC), generator and transformer? Datasheet provides power rating and mass of the equipment....can we somehow use this available info.

1 Answers  

what does the regenerative braking mean?and how it used for Dc motor? thanks.

2 Answers  

Define cuttoff frequency?

0 Answers  

do we use links in a dc circuit?if so what s its use in it?

0 Answers  

how can we make cable shedule for controll wiring ? which details must be required for it.?

0 Answers   L&T,

3 phase induction motor connection star or delta while using ac drive motor is .75 to 5.5 kw

0 Answers  

what is the meaning of 0.5ohm Resistance

0 Answers   Vardhman,

how to calculate P.F from kva only?

3 Answers  

We operate a 10 Mw facility and we have been experiencing several trips due to fluctuations on the MVAR? We have checked all issues related to the AVR and we have found all OK? Can anyone help us? The grid voltage, internal voltage, all regular parameters look ok. MVAR fluctuate and there it goes the unit? What could be happening? Thanks!

5 Answers