Answer / jai prakash narain singh

for same capacity of motor,incase it runs in star it will
draw more current reason being,phase voltage=line voltage
divided by root of 3.where as power remains same.
as you know,power =root of 3 xvolt x current xcosine angle
of volt and current, since power remains same and voltage
has reduced in this case current will increased. if this
motor is connected in delta,and suppose its full load
current is I amp,
and in star current will be root of 3 x I AMP.

how ship earthed?

5 Answers   Marico,

---

Safety of on line ups

0 Answers   Bhushan Power Steel, GE,

---

why we use core type and shell type transformers?

2 Answers  

---

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

0 Answers  

---

how to calculate induction motor rating (HP) if name plate is missing from motor at site condition ?

6 Answers   ABB, apatel, Bhel, Spatel, Voltas,

---

How do you calculate of power factor, if it is lagging or leading for unit(1).

4 Answers  

---

Difference between UPS and Inverter?

7 Answers   HCL,

---

when meggering a 3ph,480v oil reservoir heater on a regen gas compressor, why do I get a reading to ground when meggering phase to ground? shouldn't it read opened or is there something that makes it read closed? on the same heater, when ohming, it reads open. thanx

1 Answers  

---

when elecromagnatic waves are propogated in a wave guide?

0 Answers  

---

what shall be no load voltage of 132/33 kV transformer ? is it 33 kv of 34.5 kV

0 Answers  

---

12.5 tons a/c is their how much kva generator can recommend to the customer.

0 Answers  

---

Is only insulation the difference between High voltage and Medium voltage cable?

1 Answers  

---