Answer / poorna

control the speed of the fan by controlling voltage across
armature,(by varing the resistance the drop across the
resistance is changed and hence the voltage available
across armature is varied,). since torque is proportional
to square of voltage for induction motor, developed torque
and speed (as for fan load T prop to square of speed)speed
is changed

Answer / dev

in fan, inuction motor is used to drive the fan load.
the regulator of fan consists no. of resistance
contact...it changes the the resistance of ciruit.
in starting resistance is kept high for high starting
torque, at that time speed will be low..after this instant
resistances are slowly cut out...and speed will rise..

Answer / mahi&junu

switching the supply with the required resistance

Answer / mayur

the current is changed by the resistence so fan speed changed

losses in transmission lines ?

0 Answers  

---

Why we use duplex coil and hook switch in telephone system?

0 Answers  

---

why we do not get the electric shock at end of returning water of water cooled cable

1 Answers  

---

can we use 220 volt 15 w a.c. lamp on 220 volt d.c.

11 Answers   Philips,

---

what is Fan Control Cubicle

0 Answers  

---

What is chopper

1 Answers   Enercon,

---

50 electric bulbs are connected across supply of 220 volts. After one bulb is fused remaining 49 bulbs are again connected to same supply. which case will have more illumination & WHY????????

5 Answers   KJ,

---

how many single tension hardware are required on a double circuit transmission tower?

0 Answers  

---

how the specific fuel consumption of 320 kva deisel genarator set (explain with formulas please)?

2 Answers   RRB,

---

when will cause the negative sequence falut in electrical system?

2 Answers   Schneider,

---

I have motor of 3 H.P. How i found the rating of capacitor use in it in single phase motor..???

0 Answers  

---

Ratings of power transformer,Distribution transformer.

0 Answers  

---