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ESE 2021 Technical Quiz || Single Phase Transformer

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Question 1

A single-phase transformer has R(p.u.) = 0.4 p.u. and X(p.u.) = 0.6 p.u. At what power factor, the voltage regulation will be zero?

Question 2

Consider the following statements regarding transformers:
1) The function of the magnetizing component of no load current is to sustain the alternating flux in the core.
2) Short circuit test is performed to find core losses only.
3) The function of the breather in transformer is to arrest flow of moisture when outside air enters the transformer.
Which of these statements are correct?

Question 3

What is the load at which maximum efficiency occurs in case of a 100 kVA transformer with iron loss of 1 kW and full-load copper loss of 2 kW?

Question 4

Assertion (A): In a transformer, open circuit (OC) test is conducted from low voltage side and short circuit (SC) test conducted froth high voltage side.
Reason (R): OC test gives iron loss and SC test gives copper loss.

Question 5

A 2 V/1 V two winding transformer is connected as an autotransformer. Its voltage regulation as an autotransformer compared to the two winding transformer is
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Jun 5ESE & GATE EE

Posted by:

Aman AgrawalAman AgrawalMember since Jul 2020
M Tech (Power System Engg.) IIT (ISM) Dhanbad
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