Answer / george

oil emersed xformer- uses oil for cooling system

dry type xformer uses only his housing for cooling system.
we call it heat sink

Answer / raza

In Oil transformer, Mineral Oil is used for insulation and
cooling pupose but in dry type transformer, no any kind of
oil is used. In dry type transformer, other methods of
cooling are used i.e. air cold, water cold etc. and for
insulation purpose air, vaccume etc. are used.

How to select the different contactors ( starter combination) for different AC motors? what about fuse cappacity 4 different motors too?

2 Answers   Equate,

---

There are 2 motors without name plate and terminal but one is DC motor and another is induction motor.How one can identify which one is DC and which one is AC motor?

6 Answers  

---

2. What are the parameters of EHT sub-station?

1 Answers   APGenco, Blue Star, Enercon,

---

we have total 1000hp motors we paid 7 laks rupees how to reduce power bill

4 Answers  

---

why should small green grass ans small plant should not be there inside the transformer Yard in the factories

0 Answers   Riddhi Siddhi,

---

Buchholz relay is used ………. a) protection T/F b) oil T/F c) Air core T/F

8 Answers   Engineers India Limited,

---

whether Transformer is singly excited or doubly excited machine?

2 Answers  

---

how MW increase when steam input increase in turbine.

1 Answers  

---

In 3 phase induction motor even with low Voltage it reaches nearly it's rated speed why? (for example instead of 400V it reaches with 250V)

2 Answers  

---

what is the formula of knowing the clabe size on any load?

1 Answers   JSW, Scan Steel,

---

Which transformer is suitable for 220/11 kV, 60 MVA, distribution , Y-Y or D-Y or Y-D, give comparison for the same.

3 Answers  

---

150 hp moter how many kwh in 1 hour and what forfula 3 phase kwh.

5 Answers   College School Exams Tests, CPCL, Syncom, Thermax,

---