Answer / k.prakashchandra

It is not possible to improve IR value as insulation can not
be injected.You can remove the water contents by heating the
coils by making full load current pass through ,using 3
phase dimmer-stat with rotor locked.

Answer / prem

insulation resistance is measured using megger.if megger shows
meaurable value in tens or hundereds then just change the insulatin of lt motor to improve it.

Answer / k.prakashchandra

With dimmer-stat (auto-transformer),it may not be possible
to get full load current in large motors .Then you have to
use strip heaters for heating the coils or DC supply (no
back emf)

explain how to protect high rise building from the risk of lighting.

1 Answers  

---

How instantanious short circuit current is calculated? its formula?

1 Answers  

---

sir, I am from EEE branch.On feb 17 iam going to write an Exam for hindustan petrolium corporation Ltd.So plz send me the written exam pattern/Q's/interview questions.please mail to eee_dharmendra@yahoo.com

0 Answers  

---

how the fan is switched off immediately switching off the switch?

2 Answers  

---

Is RTCC panel needs any control supply.

0 Answers   HPCL, Schneider,

---

In 11KV Double pole structure for each phase we are using Disc one Insulator. Why we are not using 2 r above insulators instead of one insulator?

4 Answers   Genus,

---

why is the HT voltages are in multiples of 11KV

1 Answers   Clariant,

---

how commomn gate triggering is given for TRIAC ? other thyristor wont be efffected?

0 Answers   BARC,

---

what is meant by IGBT how they differ from tyristor ?

0 Answers  

---

how does electrical train works and what type of motors are used to drive the train? which level of supply voltage is used?

22 Answers   Alstom, Infotech,

---

what is the temperature rise test? explain in brief.with formula.

1 Answers  

---

Distribution Transformer are connected in configuration? a. Star/delta b. delta/star c. star/star d. delta/delta

7 Answers   IPR, Maruti Suzuki,

---