1
GATE EE 2004
MCQ (Single Correct Answer)
+2
-0.6
The resistance and reactance of a 100 kVA 11000|400 V, $$\triangle$$ - Y distribution transformer are 0.02 and 0.07 pu respectively. The phase impedance of the transformer referred to the primary is
A
(0.02 + j0.07) Ω
B
(0.55 + j1.925) Ω
C
(15.125 + j52.94) Ω
D
(72.6 + j254.1) Ω
2
GATE EE 2004
MCQ (Single Correct Answer)
+2
-0.6
A 500 kVA, 3-phase transformer has iron loses of 300 W and full load copper losses of 600 W. The percentage load at which the transformer is expected to have maximum efficiency is
A
50.0%
B
70.7%
C
141.4%
D
200.0%
3
GATE EE 2004
MCQ (Single Correct Answer)
+2
-0.6
A 50 kVA, 3300/230 V single-phase transformers is connected as an autotransformer shown in figure. The nominal rating of the autotransformer will be GATE EE 2004 Electrical Machines - Transformers Question 54 English
A
50.0 kVA
B
53.5 kVA
C
717.4 kVA
D
767.4 kVA
4
GATE EE 2003
MCQ (Single Correct Answer)
+2
-0.6
Figure shows an ideal single-phase transformer. The primary and secondary coils are wound on the core as shown. Turns ratio $$\left(\frac{N_1}{N_2}\right)$$=2. The correct phasors of voltages $$E_1,\;E_2$$ currents $$I_1,\;I_2$$ and core flux $$\phi$$ are as shown in GATE EE 2003 Electrical Machines - Transformers Question 52 English
A
GATE EE 2003 Electrical Machines - Transformers Question 52 English Option 1
B
GATE EE 2003 Electrical Machines - Transformers Question 52 English Option 2
C
GATE EE 2003 Electrical Machines - Transformers Question 52 English Option 3
D
GATE EE 2003 Electrical Machines - Transformers Question 52 English Option 4
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