Answer / biswajit sahoo

IT DEPENDS TYPE OF LOAD IT VARRIES FROM 20 S TO 80 SEC

Answer / srinivas

In star delta starter first star contactor will be in action after some delay time delta contactor will come in to picture and no need of time delay for star contactor.

At the time of starting motor ohmic resistance is zero and hence the back EMF zero. So it will takes more current, it may cause winding damage. So we have to reduce the starting currents. it is possible by connecting the motor terminals as star at the starting. Time delay range depends on what type of load used in motor and rating of motor. Normally the time delay range will set to reach above 70% of the motor load.

sir please send me previous year questions of jspl through which i could prepare myself fpr the test.

64 Answers   FGH, HFT, Jindal, Jindal Steel and Power, JSP, JSW, Lin Engineering,

---

single phase for 230 then why three phase are 440 volt

4 Answers   ACIL,

---

why we step up voltage for reducing the loss, even if voltage and current are proportional anr resistance remains same

12 Answers   Sarhad University,

---

whatis the difference between electrical and electronics?

11 Answers  

---

my UPS is 600VA with 0.6 p.f and i use it for my computer which has 450W power supply unit, a monitor of 633nW and speakers. Can any one explain this.. because the output of UPS should be 360W (<450W)

2 Answers  

---

In directional earth fault protection for generator, one core balance CT is for residual current, what other CT is for, which is placed on neutral?

2 Answers  

---

hi frnds can any one help me ? plz send me placement paper of IOCL of Electrical streem .... plz send ....its urgent....

0 Answers  

---

Tell me in detail about c.t. And p.t. ?

0 Answers  

---

TYPE'S OF BREKAR ,WHAT IS TRANSFORMAR & SAFTY. STARTER DOL & STAR DELTA STARTER.

0 Answers   Amtek,

---

How we calculate DC inducation moter Amp? Sir pls give me formula......

0 Answers   Superlite,

---

errection check list for transformer maintenance

0 Answers   RRB,

---

what is meant by GD2 ?

1 Answers   Kirloskar,

---