Electrical Machine - IES Academy

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IES Academy
Transformer
Chapter-1
Under this operating condition with the primary bus-bars being
energised, a circulating current will flow:
[IES-2005]
(a) Only in the secondary windings of A and B
(b) In both the primary and the secondary windings of A and B
(c) In both the primary and the secondary windings of A and B, as well as in the
primary side network
(d) In the primary and the secondary windings of A and B and boost the voltages
on the secondary side of both A and B
DIRECTION:
The following three items consist of two statements, one labelled as ‘Assertion A’
and the other labelled as ‘Reason R’. You are to examine these two statements
carefully and decide if the Assertion A and the Reason R are individually true and if
so, whether the Reason is a correct explanation of the Assertion. Select your
answers to these items using the codes given below:
Codes:
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
IES-42.
Two Transformers when operating in parallel will share the load
depending upon which of the following
[IES-2007]
(a) Magnetizing current
(b) Leakage reactance
(c) Per unit impedance
(d) Efficiency
Transformer Construction
IES-43. The use of higher flux density in the transformer design [IES-2003]
(a) Reduces the weight per kVA
(b) Increases the weight per kVA
(c) Has no relation with the weight of transformer
(d) Increases the weight per kW
IES-44. The function of oil in a transformer is to provide [IES-2003]
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