1
GATE EE 2015 Set 2
MCQ (Single Correct Answer)
+2
-0.6
A three-winding transformer is connected to an AC voltage source as shown in the figure. The number of turns are as follows: N1=100, N2=50, N3=50. If the magnetizing current is neglected, and the currents in two windings are $${\overline I}_2=2\angle30^\circ$$ A and $${\overline I}_3=2\angle30^\circ$$ A, then what is the value of the current $${\overline I}_1$$ in Ampere?
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2
GATE EE 2014 Set 1
MCQ (Single Correct Answer)
+2
-0.6
The core loss of a single phase, 230/115 V, 50 Hz power transformer is measured from 230 V
side by feeding the primary (230 V side) from a variable voltage variable frequency source
while keeping the secondary open circuited. The core loss is measured to be 1050 W for
230 V, 50 Hz input. The core loss is again measured to be 500W for 138 V, 30 Hz input. The
hysteresis and eddy current losses of the transformer for 230 V, 50 Hz input are respectively.
3
GATE EE 2014 Set 3
MCQ (Single Correct Answer)
+2
-0.6
The mean thickness and variance of silicon steel laminations are 0.2 mm and 0.02
respectively. The varnish insulation is applied on both the sides of the laminations. The mean
thickness of one side insulation and its variance are 0.1 mm and 0.01 respectively. If the
transformer core is made using 100 such varnish coated laminations, the mean thickness and
variance of the core respectively are
4
GATE EE 2014 Set 3
MCQ (Single Correct Answer)
+2
-0.6
The parameters measured for a 220V/110V, 50 Hz, single-phase transformer are:
Self inductance of primary winding = 45 mH
Self inductance of secondary winding = 30 mH
Mutual inductance between primary and secondary windings = 20 mH
Questions Asked from Transformers (Marks 2)
Number in Brackets after Paper Indicates No. of Questions
GATE EE 2023 (1)
GATE EE 2018 (2)
GATE EE 2017 Set 1 (1)
GATE EE 2017 Set 2 (1)
GATE EE 2016 Set 2 (2)
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GATE EE Subjects
Electromagnetic Fields
Signals and Systems
Engineering Mathematics
General Aptitude
Power Electronics
Power System Analysis
Analog Electronics
Control Systems
Digital Electronics
Electrical Machines
Electric Circuits