Answer / tariq

The above answer is correct but at some extent. The
connection is switched from Star to Delta when motor
attained it 70~80 percent speed of its full speed. The time
of attaining this speed is counted and the timer is adjusted
accordingly

Answer / dhanesh

It depends on the motor rating. Big motor requires more time
to achieve the rated rpm so the timer can be set to 10-15
sec while for small motors (upto 50HP) it can set to 8-10 sec.

what is the minimum recommended leakage current of an earthed cable connected to the body or skid of an alternator

0 Answers  

---

Transformer calculation

1 Answers   Aramco, LMW Lakshmi Machine Works Limited,

---

what is the meaning of ceiling voltage in Generator exciter?

1 Answers  

---

When the relative speed between the magnetic fields of stator and rotor does is zero under steady state operation?

0 Answers   HPCL,

---

no of rotrs poles in salient pole synchronous machine

3 Answers  

---

please send me RRB electrical engineer previous year questions for Sr. Section Engineer

0 Answers  

---

why 6.6,11,22,33,66kv? what basis they have considered?

5 Answers  

---

why stay insulator is not used with stay wire for 11kv Lines. Whereas it is used for LT lines ?

2 Answers   Essar,

---

1 Ton is equal to how many watts?

0 Answers  

---

What is the formula to find out cross sectional area of cable for certain current rating?

1 Answers   MRF,

---

what may the reason for vector shift in a generator?

0 Answers  

---

Why Stabilising Resistor used in REF circuit ?

0 Answers  

---