1
GATE EE 2008
MCQ (Single Correct Answer)
+2
-0.6
The core of two-winding transformer is subjected to a magnetic flux variation as indicated in the figure. GATE EE 2008 Electrical Machines - Transformers Question 17 English 1 GATE EE 2008 Electrical Machines - Transformers Question 17 English 2

The induced $$emf$$ $$\left( {{e_{rs}}} \right)$$ in the secondary winding as a function of time will be of the form

A
GATE EE 2008 Electrical Machines - Transformers Question 17 English Option 1
B
GATE EE 2008 Electrical Machines - Transformers Question 17 English Option 2
C
GATE EE 2008 Electrical Machines - Transformers Question 17 English Option 3
D
GATE EE 2008 Electrical Machines - Transformers Question 17 English Option 4
2
GATE EE 2008
MCQ (Single Correct Answer)
+2
-0.6
Three single-phase transformers are connected to form a $$3$$-phase transformer bank. The transformers are connected in the following manner. GATE EE 2008 Electrical Machines - Transformers Question 20 English

The transformer connection will be represented by

A
$$Yd0$$
B
$$Yd1$$
C
$$Yd6$$
D
$$Yd11$$
3
GATE EE 2007
MCQ (Single Correct Answer)
+2
-0.6
A single-phase $$50$$ $$kVA,$$ $$250$$ $$V/500V$$ two winding transformer has an efficiency of $$95\% $$ at full load, unity power factor. If it is reconfigured as a $$500V/750V$$ auto-transformer, its efficiency at its new rated load at unity power factor will be
A
$$95.752\% $$
B
$$97.851\% $$
C
$$98.276\% $$
D
$$99.241\% $$
4
GATE EE 2006
MCQ (Single Correct Answer)
+2
-0.6
A $$300$$ $$kVA$$ transformer has $$95\% $$ efficiency at full load $$0.8$$ $$pf$$ lagging and $$96\% $$ efficiency at half load, unity $$pf.$$

The iron loss $$\left( {{P_i}} \right)$$ in $$kW,$$ under full load operation are

A
$${P_c} = 4.12,\,\,{P_i} = 8.51$$
B
$${P_c} = 6.59,\,\,{P_i} = 9.21$$
C
$${P_c} = 8.51,\,\,{P_i} = 4.12$$
D
$${P_c} = 12.72,\,\,{P_i} = 3.07$$
GATE EE Subjects
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12