1
GATE EE 2006
MCQ (Single Correct Answer)
+1
-0.3
In transformers, which of the following statements is valid?
A
In an open circuit test, copper losses are obtained while in short circuit test, core losses are obtained.
B
In an open circuit test, current is drawn at high power factor.
C
In a short circuit test, current is drawn at zero power factor
D
In an open circuit test, current is drawn at low power factor.
2
GATE EE 2005
MCQ (Single Correct Answer)
+1
-0.3
Which three-phase connection can be used in a transformer to introduce a phase difference of 30° between its output and corresponding input line voltages
A
Star - Star
B
Star - Delta
C
Delta - Delta
D
Delta - Zigzag
3
GATE EE 2003
MCQ (Single Correct Answer)
+1
-0.3
A single phase transformer has a maximum efficiency of 90% at full load and unity power factor. Efficiency at half load at the same power factor is
A
86.7%
B
88.26%
C
88.9%
D
87.8%
4
GATE EE 2002
MCQ (Single Correct Answer)
+1
-0.3
A 1 kVA, 230V/100V, single phase, 50 Hz transformer having negligible winding resistance and leakage inductance is operating under saturation, while 250 V, 50 Hz sinusoidal supply is connected to the high voltage winding. A resistive load is connected to the low voltage winding which draws rated current. Which one of the following quantities will not be sinusoidal?
A
Voltage induced across the low voltage winding
B
Core flux
C
Load current
D
Current drawn from the source
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