Answer / nirmal

pls help me to get the answer

In alternator generally we give DC voltage to field of alternator but field (excitor)produce Ac & converts into DC by rotating rectifier(RR ) then fed to rotor .my question is why we cannot give dc voltage directly to rotor instead of Excitor & RR ?

1 Answers  

---

What should do when induction motor take more load in single phase ?

1 Answers  

---

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

11 Answers   Philips,

---

What is the difference between Dielectric and Insulator

9 Answers  

---

what is the difference between indoor & Out door substations

5 Answers   HSBC,

---

plz send me HPCL apptitude paper.. maulik_elect@yahoo.co.in

0 Answers   HPCL,

---

how capacitor buield up the voltage

3 Answers  

---

A 100 MVA transformer may be cooled with?

6 Answers   HCL,

---

What is the difference between PS & metering CT (5p20,0.5 etc.)? Why in PS class CT only Vk is given ? Is PS class CT is more accurate than metering CT?

0 Answers  

---

why the starting torque is high in dc series motor..

3 Answers   GM General Motors,

---

What should be the value of earth resistance for an instrumentation/electronic circuit? As per which IS/IEC Code?

3 Answers   IOCL,

---

how steam converted into electricity in power plant

4 Answers  

---