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.

Why the tank of transformer is made rectangular not circular??

9 Answers  

---

what is advantage in open delta connection?

20 Answers  

---

In a 3 phase squirrel cage induction motor why does rotor rotate? will 3 phase transformer rotate like a motor if it is placed on bearings and powered up? give reason

10 Answers   Siemens,

---

difference between high and low impedance BUS BAR relay??

0 Answers  

---

HOW MUCH CURRENT CAN A 3 -1/2 CORE 100 MM WIRE CARRY

2 Answers   Focus Energy, San,

---

What is the difference between INVERTER and UPS?

7 Answers  

---

Who is the first Bangladeshi Everest climber? Where is his home district?

1 Answers  

---

sir, Two different rating of generator going to connect parallel, can it set same DROOP or different. Why? Please explain

2 Answers   Kirloskar,

---

In a transformer, the hysteresis and eddy current losses depend upon 1.load current 2.maximum flux density in core 3.type of lamination 4.supply frequency The correct statements are (a) 1 and 3 (b) 2 and 3 (c) 1 and 4 (d) 2 and 4

9 Answers  

---

what is relation between voltage and current and don't take resistance here. if we supose say when there is increase in voltage whwt happens to current?is it decrease or increase?

4 Answers  

---

What is multiplying factor of meter if the meter ctr and ptr is open type?

1 Answers  

---

what is meant by 3rd hormonics ?

0 Answers   VRVS,

---