Answer / haneef khan gtr

Drives have to use for starting motor smoothly and control
the speed of its( as per requirement)except its it protect
the motor by any fault,with faults codes identification.

Answer / s k deo

To limit Motor Starting current & Save Power consumption.

Answer / vaseekaran

THE VFD DRIVES ARE USED TO CONTROL THE SPEED OF THE MOTOR.THIS CONCEPT OF CONTROL THE SPEED IS BY CONTROL THE FREQUENCY OF THE INCOMING SUPPLY.HENCE THE AC SUPPLY IS HAVING THE FREQUENCY SO IT IS POSSIBLE TO USE THE DRIVES ONLY FOR AC LOADS.

Why celing fans will rotate slowly after some days.?

2 Answers  

---

Why we use a H.T. Fuse from a thick wire, on other side we use high rating of cables? & Why we use less Sq. mm Cable on H.T. side , on other side we use Large Sq. mm cable?

1 Answers  

---

A dc motor running on dc drive whose input is 3ph AC what will happen if we change the phase sequence of dc drive for e.g (R Y B) is connect as R B Y, will the motor run as same as previously running before changing phase without any effect

4 Answers  

---

If I fill the form of engineering services and I left the exam de to navoidable reasons . Will it counts my one attempt

2 Answers  

---

What is different type of Electrical curve and how it protects the equipment's while up-normal situation?

0 Answers  

---

In motors how many types of cooling systems were used?

0 Answers   NTPC,

---

Why the suply frequency in INDIA is 50HZ

2 Answers   HCL,

---

Whatis the procedure for getting Electrical (light) licence while Iam a diploma holder in electrical Engg . I Compleated my one yr Apprentice training & worked as a junior engineer (ele) for 2 yr(contract basis).

1 Answers   TVS,

---

AC voltage only create magnetic flux in coils, but in Solenoid coil how 24V DC volt create flux and pick the plunger

5 Answers  

---

we have 400kv/6.6kv transformer ,it has total 9 taps on HV side with normal tap on tap no 5.when we took the ratio test we observed that ratio was decreasing from tap 1 to tap 5 and was found increasing from tap 5 to tap 9.What is the reason?if anyone have related document then please send me on the email id ankushbahale@gmail.com......plz plz

1 Answers  

---

I am working in 600MW power plant currently in erection phase. I came along this term and want to know its meaning in simple language, consider me naive!?? All motors shall be of energy efficient type EFF-2 as per IS:12615/ equivalent IEC / International Standard.

1 Answers   Punj Lloyd Ltd,

---

why is one voltage transformers (instead of three ) installed at the entrence of the incoming line in a substation.

2 Answers  

---