1
GATE EE 2014 Set 2
Numerical
+1
-0
A single phase, 50 kVA, 1000 V/100 V two winding transformer is connected as an autotransformer as shown in the figure. GATE EE 2014 Set 2 Electrical Machines - Transformers Question 77 English The kVA rating of the autotransformer is _________.
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2
GATE EE 2014 Set 1
MCQ (Single Correct Answer)
+1
-0.3
For a specified input voltage and frequency, if the equivalent radius of the core of a transformer is reduced by half, the factor by which the number of turns in the primary should change to maintain the same no load current is
A
1/4
B
1/2
C
2
D
4
3
GATE EE 2013
MCQ (Single Correct Answer)
+1
-0.3
A single-phase transformer has no-load loss of 64 W, as obtained from an open circuit test. When a short-circuit test is performed on it with 90% of the rated currents flowing in its both LV and HV windings, he measured loss is 81 W. The transformer has maximum efficiency when operated at
A
50.0% of the rated current.
B
64.0% of the rated current.
C
80.0% of the rated current.
D
88.8% of the rated current.
4
GATE EE 2011
MCQ (Single Correct Answer)
+1
-0.3
A single phase air core transformer, fed from a rated sinusoidal supply, is operating at no load. The steady state magnetizing current drawn by the transformer from the supply will have the waveform
A
GATE EE 2011 Electrical Machines - Transformers Question 81 English Option 1
B
GATE EE 2011 Electrical Machines - Transformers Question 81 English Option 2
C
GATE EE 2011 Electrical Machines - Transformers Question 81 English Option 3
D
GATE EE 2011 Electrical Machines - Transformers Question 81 English Option 4
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