Answer / prasanna kumar das

To prevent the equipments from lightning strokes. Because
the cloud is negatively charged at bottom it requires a zero
or a positive potential to discharge, and it selects the
ground (Zero potential) to discharge. If the Telecom
Equipments are fed with positive the cloud will choose the
low resistance tallest positively charged Antenna's to
discharge, this could damage the entire setup of Telecom
equipments. So the Telecom equipments are fed with Negative
supply Voltage

Read more:
http://wiki.answers.com/Q/Why_telecom_equipments_work_in_negative_voltage#ixzz23mgK9os7

Answer / ashish bansal

if got, Kindly mail me to

Answer / mukesh

i dont no. so please give me perfect answer on my email.

urgent.

thanks.

wht do u mean by constant flux linkage theorem ?

3 Answers  

---

What are the main advantages of bode plot?

0 Answers  

---

why permanent magnet generator have higher frequency of 400hz

3 Answers   Jaypee,

---

Difference between Earthing Truck & Earthing trolly for HT panel

0 Answers   Moolchand Medcity,

---

IT IS DESIRABLE THAT THE INCOMING MACHINE SHOULD BE A LITTLE FAST AT THE TIME OF SYNCHRONIZING.EXPLAIN?

1 Answers  

---

---

ABOUT AC GENARETORS AND MAINTANANCE AND TYPES OF GENARETORS

1 Answers  

---

what is die electric strnth of transformer ?

0 Answers  

---

Can u tell me design of switch yard

0 Answers   NTPC,

---

what is the working principale of air circuit breaker ?

5 Answers  

---

In a star-star connected h.t transformer why we use NGR on the secondary (l.t)side.

3 Answers   Star, TATA,

---

please tell me the all the spcications of the 100MW 11KV HYDEL POWER PLANT SPECICATIONS

2 Answers   Bhel,

---

what is the effect of power factor in electrical circuit ? if we mainten power factor near about unity (0.999) our energy consumption Units increase or decrease?

11 Answers   Piramal Healthcare,

---