Answer / m. ahatesham shaikh

mostly electrical power is generated by running alternators with the help mechanical turbine. and turbines gives best efficiency in the speed range of 3000rpm to 3600rpm.
and frequency of generated electricity is given by
f=((P*N)/120)Hz, P= No. of poles of alternator, N= Speed in rpm.
and mostly 2 poles alternators are used.
therefore ((2*3000/)/120)=50
that's why some countries have selected 50Hz (using 3000rpm) and some 60Hz (3600rpm).
and India has selected 50Hz using 3000rpm.

Answer / post master

because we carry the British legacy.

How to test and satisfy the conditions of the vector group YNd1 for power transformer?

1 Answers   Areva,

---

why not use capacitor in Dg sets.

10 Answers   Birla,

---

What is the function of retrip in busbar?

0 Answers   Getco,

---

Difference between divercity and power factor

1 Answers  

---

How can i modify the design of 3 phase induction motor to be as 3 phase synchronous motor??

2 Answers  

---

---

if 40 watt bulb has higher resistance then a 100watt bulb then according to joul farmula p=I^2R the 40 watt bulb more power consume then 100 watt bulb.

5 Answers  

---

what is the difference betwteen overcurrent and short circuit fault?

3 Answers  

---

List out the the types of Mounting Light fixture?

0 Answers   HLL,

---

why heat produced at junction of two different conductor. what care should be taken to minimize it.

11 Answers   Birla, Maihar Cement,

---

why high current produce in case of transformer when turns are internally gets shorted.

3 Answers   TCS,

---

How REF protects transformer alone? explain with diagram.

0 Answers  

---

Why IR value of the (HT cable Plus synchronous motor) is less while individually having IR values in GΩ?

0 Answers  

---