Answer / p.v.loganathan

basicaly five types of transformer:
* step up transformer
* step down transformer
* potential transformer
* current transformer
* isolation transformer

Answer / sanjeet swarnakar

step up transformer
step down transformer
auto transformer

Answer / vinodkumar ks

Ther are 3 types of transformer?

1. CORE TYPE
2. SHELL TYPE
3. BERRY TYPE

Answer / bhanu pratap

depending on application
1.Distribution
2.Power
3.Control
4.Auto
5.Isolation
6.Instrument potential
7.Instrument current
depending on construction
1.core type
2.shell type

Answer / vin

(i) According to core,

1. Core type.

2. Shell type.

(a) Simple Shell,

(b) Distributed Shell.

(ii) According to winding.

1. Two winding (ordinary type).

2. Single winding (Auto type).

3. Three winding (Power transformer).

(iii) According to phase.

1. Single phase.

2. Three phase.

(iv) According to arrangement of coils.

1. Cylindrical type.

2. Disc type.

(v) According to use.

1. Power Transformers.

2. Distribution Transformers.

3. Instrument Transformers

(a) Current transformer,

(b) Potential transformer.

(vi) According to type of cooling

(a) Natural cooled.

(i) Natural air cooled.

(ii) Oil immersed natural cooled.

(iii) Oil immersed natural cooled with forced oil circulation.

(b) Forced air cooled.

(i) Oil immersed air blast cooled.

(ii) Oil immersed air blast cooled with forced air circulation.

(c) Water cooled.

(i) Oil immersed water cooled.

(ii) Oil immersed water cooled with forced oil circulation.

Answer / azim

1)power 2)current 3)instrument 4)pulse 5)Flyback
6)step-up 7)step-dowm

Answer / saurabh gupta

Types of transformers:
a. Distribution
b. Power
c. Control
d. Auto
e. Isolation
f. Instrument potential
g. Instrument current

Answer / aniket singhwal

a)According to Voltage
1)Step-Up transformers
2)Sttep-down transformers
3)Auto transformers
C)BASED ON THEIR CONSTRUCTION OF CORE
1)CORE TYPE
A)Air Core transformers
B)Iron Core transformers
C)Ferrite Core transformers
2)SHELL TYPE
d)further based on phase as,
1)1-phase
2)3-phase

Answer / nayeem basha

the types of transformers are

1.single phase transformer
2.three phase transformer
a.core type
b.shell type
3.auto transformer

Answer / deepak

A)power transformer
B)distribution transformer

Classification based on construction:

Core Type
Shell Type

Classification based on number of phases:
Single Phase
Three Phase

Classification based on Voltage:
Step-up
Step-down

(1)The demand for electricity , the amount of renewable generation available, the amount of fossil fuel generation available and the cost of the fossil fuel generation are shown in table below period(hrs) demand(MW) renewable (MW) fossil- fuel(MW) cost of fossil fuel(MW) 00.00 - 01.00 2000 1800 2000 30 01.00 - 02.00 2300 2500 2000 30 02.00 - 03.00 2500 2700 2100 45 03.00 - 04.00 2900 3100 2100 50 04.00 - 05.00 2700 2600 2500 45 05.00 - 06.00 2400 2000 2700 50 06.00 - 07.00 2200 1800 2000 36 07.00 - 08.00 2100 1600 2000 36 Assuming that the renewable generation incurs zero cost, determine an optimal generation schedule(specifying the amount of renewable generation and fossil fuel generation used in each period, the cost for each period and the overall cost for 8 hours.)

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