1
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
A
30 mm and 0.22
B
30 mm and 2.44
C
40 mm and 2.44
D
40 mm and 0.24
2
GATE EE 2014 Set 3
MCQ (Single Correct Answer)
+2
-0.6
An open circuit test is performed on 50 Hz transformer, using variable frequency source and keeping V/f ratio constant, to separate its eddy current and hysteresis losses. The variation of core loss/frequency as function of frequency is shown in the figure GATE EE 2014 Set 3 Electrical Machines - Transformers Question 62 English The hysteresis and eddy current losses of the transformer at 25 Hz respectively are
A
250 W and 2.5 W
B
250 W and 62.5 W
C
312.5 W and 62.5 W
D
312.5 W and 250 W
3
GATE EE 2014 Set 3
Numerical
+2
-0
The load shown in the figure absorbs 4 kW at a power factor of 0.89 lagging. GATE EE 2014 Set 3 Electrical Machines - Transformers Question 63 English Assuming the transformer to be ideal, the value of the reactance X to improve the input power factor to unity is ___________.
Your input ____
4
GATE EE 2014 Set 2
MCQ (Single Correct Answer)
+2
-0.6
For a single phase, two winding transformer, the supply frequency and voltage are both increased by 10%. The percentage changes in the hysteresis loss and eddy current loss, respectively are
A
10 and 21
B
-10 and 21
C
21 and 10
D
-21 and 10
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