Answer / paras315

in single phase induction motor stator has single phase
winding,when we give single phase supply, it creats a
pulsating magnetic flux in the air gap but for rotor
rotation there should be a rotating flux.so it is not self
starting.
for starting either auxiliary winding or any means which
splits the single phase flux in at least 2 phase flux can be
used

Answer / wareagle

You could have gone to Google and found this for yourself.


"Single phase induction motor can't produce continuously
rotating magnetic field in the air gap, as either N or S
pole would be present at a time. Single pole is not
sufficient to drive the rotor from one end. So a capacitor
is employed to shift the phase."

Answer / kaushal

Single phase supply to motor can't produce continuously
rotating magnetic field as either N or S
pole would be present at a time. so there will not be force
of repulsion as well as attraction This is not sufficient
to drive the rotor from one end. So a capacitor
is employed to shift the phase & to create rotating magnetic
field.

Why are short circuit ratings always 16kA,25kA,36kA and 50kA.Who has fixed these?

0 Answers  

---

what is the difference between UPS & Inverter

7 Answers   HAL,

---

hi friends can u tell me name of the sites where i can get animation of electrical machines......

1 Answers  

---

I want to calculate how much capacitor we connect to maintain the unity power factor? Is there any formula? Pls give me the answer

0 Answers  

---

if two bulb of 50w &30w apply in series having 230v the which bulb glow bright ,why

10 Answers  

---

How to calculate wire length,size & current? ( related to control panel)

0 Answers   FSS, GK Controls, Panel Tech,

---

what is the temperature rise test? explain in brief.with formula.

1 Answers  

---

what is the exact direction of current? as we know current travels from higher potential to lower potential,so if we take battery +ve to -ve implies current direction is from positive terminal to negative terminal.,whereas electrons flow from negative to positive as they are attracted by positive ions.current will be the plow of charge but not flow of positive ions.please clarify my doubt friends.

2 Answers  

---

For 300MW and over a distance 250 km, what voltage be selected? and no. of circuit?

5 Answers   DPL, NTPC,

---

In Railway,why we are used HT Line 25KV ?.why we are not used 11KV,33KV and others for This?

37 Answers   Airtel, BSNL, RRB,

---

why we oltc on hv side of tranformer only

10 Answers  

---

TYPE'S OF BREKAR ,WHAT IS TRANSFORMAR & SAFTY. STARTER DOL & STAR DELTA STARTER.

0 Answers   Amtek,

---