1
GATE EE 2010
MCQ (Single Correct Answer)
+1
-0.3
A single-phase transformer has a turns ratio of 1:2, and is connected to a purely resistive load as shown in the figure. The magnetizing current drawn is 1 A, and the secondary current is 1 A. If core losses and leakage reactances are neglected, the primary current is GATE EE 2010 Electrical Machines - Transformers Question 82 English
A
1.41 A
B
2 A
C
2.24 A
D
3 A
2
GATE EE 2009
MCQ (Single Correct Answer)
+1
-0.3
The single phase, $$50$$ $$Hz$$ iron core transformer in the circuit has both the vertical arms of cross sectional area $$20\,\,c{m^2}$$ and both the horizontal arms of cross sectional area $$10\,\,c{m^2}$$. If the two windings shown were wound instead on opposite horizontal arms, the mutual inductances will GATE EE 2009 Electrical Machines - Transformers Question 28 English
A
double
B
remain same
C
be halved
D
become one quarter
3
GATE EE 2008
MCQ (Single Correct Answer)
+1
-0.3
It is desired to measure parameters of $$230$$ $$V/115$$ $$V,$$ $$2$$ $$kVA$$, single-phase transformers. The following watt-meters are available in a laboratory:
$${W_1}:250\,\,V,\,\,\,10\,\,A,\,\,\,\,\,\,$$ Low Power Factor
$${W_2}:250\,\,V,\,\,\,5\,\,A,\,\,\,\,\,\,$$ Low Power Factor
$${W_3}:150\,\,V,\,\,\,10\,\,A,\,\,\,\,\,\,$$ High Power Factor
$${W_4}:150\,\,V,\,\,\,5\,\,A,\,\,\,\,\,\,$$ High Power Factor

The watt-meters used in open circuit test and short circuit test of the transformer will respectively be

A
$${W_1}$$ and $${W_2}$$
B
$${W_2}$$ and $${W_4}$$
C
$${W_1}$$ and $${W_4}$$
D
$${W_2}$$ and $${W_3}$$
4
GATE EE 2007
MCQ (Single Correct Answer)
+1
-0.3
In a transformer, zero voltage regulation at full load is
A
not possible
B
possible at unity power factor load
C
possible at leading power factor load
D
possible at lagging power factor load
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