Electrical Machines
Induction Machines
Marks 1Marks 2
Synchronous Machines
Marks 1Marks 2Marks 5
1
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
2
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.
3
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
4
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%
GATE EE Subjects
Electromagnetic Fields
Signals and Systems
Engineering Mathematics
General Aptitude
Power Electronics
Power System Analysis
Analog Electronics
Control Systems
Digital Electronics
Electrical Machines
Electric Circuits
Electrical and Electronics Measurement