Answer / ziauddin

if 220v dc supply is given to 1-p fan of 220v then the emf produced is zero n there are no flux ploduced by the magnet n torque wich is used to rotate fan is also zero hence it leads to burning f winding

Answer / muthu

wkt inductor will block DC. capacitor will block AC.
induction motor acts as a principle of induction. so it
will not work in case of DC.

Answer / p.senthik kumaar

Then, the fan does not rotate.
Because, stator and rotor are seperated by different cycles..
It was phase shifted by 90 degree..
But, capacitor blocks a dc supply.
So, not run..
But, dc produce STATIC MAGNETIC FLUX.
and ac produce RoTATING MAGNETIC FLUX.
So, not possible in induction motor.
It, is possible only in universal motor to run both ac and dc..

How can I calculate the trnaformer effciency at different loading condition?

2 Answers  

---

i have applied for the post of RRB section engineering chennai board please send me previou papers and solved answer. my mail id jagarapusrinivas@gmail.com

0 Answers   RRB,

---

why AC cannot to be stored and DC cannot be transmitted?

11 Answers   IBM,

---

whta does the middle finger stands in flemings left hand rule

3 Answers  

---

Can u explain : what is supply for train (whether a,c or d.c ).I know that supply is 25000v a.c .But there is rumour that supply is D.C. And also explain how lights and fans inside the trains are working ,and what type of motors are used in trains whether D.C motors or induction motors .If d.c motor, how it gets supply.If traction motors are used then what are traction motors and its functions and how it differs from other motors and also explain about locomotive . please reply..............

9 Answers   NTPC,

---

why impudance relay used for medium transmission power system? why not others?

0 Answers  

---

what is difference between vaccum circuit breaker and air circuit breaker?

2 Answers  

---

what is the transformer efficiency?

5 Answers  

---

Why Delta Star Transformers are used for Lighting Loads.

6 Answers  

---

what is the function of commutator in dc motor?

52 Answers   Aviation, HP, Raj Construction, TCE, University Exams,

---

CAN A CD/CLOCK RADIO WITH 110V 60HZ WORK ON A 110V 50HZ FEED.

3 Answers  

---

WHAT IS THE FORMULA FOR CALCULATING CURRENT RATING(DIRECT IN GROUND OR AIR) OF ARMOURED(XLPE) CABLE OF 4C,16Sqmm?

0 Answers  

---