41
|
On which parameter the weight of the copper winding
in the transformer depends?
|
42
|
What amount of power transfer inductively and
conductively in the step down transformer?
|
Step
down auto transformer
|
|
43
|
State the application of the auto transformer.
|
Application
|
|
44
|
Describe the advantages and disadvantages of auto
transformer as compared to conventional transformer.
|
Advantages
Disadvantages
|
|
45
|
Give reason : The kVA rating of the auto transformer
is higher than the conventional transformer.
|
kVA rating of the auto transformer
|
|
46
|
At what condition the parallel operation of the two
transformers are required?
|
Necessary
of parallel operation
|
|
47
|
What is necessary and essential condition for
parallel operation of the transformers?
|
Condition
for parallel operation of transformers
|
|
48
|
Why two transformers must be connected in parallel with
correct polarity?
|
When two transformers are connected in parallel with
incorrect polarity there is dead short circuit at secondary side even at no
load.
|
|
49
|
In which conditions, parallel operated two
transformers do not share the load directly proportional to kVA rating?
|
When the impedance triangle of the both transformers
is not identical in shape and size, two transformers do not share load
directly proportional to kVA rating.
|
|
50
|
Comment on the statement : When two transformers are
operate in parallel ( a ) X / R ratio of the transformers are not identical (
b ) two transformers have different voltage ratio
|
X / R
ratio
Voltage
ratio
|
|
51
|
Describe the advantages and disadvantages of three
phase transformer over three single phase unit.
|
Advantages
of three phase transformer over three single phase unit
Disadvantages
of three phase transformer over three single phase unit
|
|
52
|
What are the advantages of star neutral point of the
transformer is connected to the neutral point of the generator winding?
|
The star point of the transformer is connected to
the star point of the generator winding to eliminate distortion of the
secondary phase voltage in the transformer.
|
|
53
|
What is function of the tertiary winding?
OR
How to avoiding problem of floating neutral in the
star connected transformer?
|
Function
of tertiary winding
|
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