Electrical Machines
Induction Machines
Marks 1Marks 2
Synchronous Machines
Marks 1Marks 2Marks 5
1
GATE EE 2003
MCQ (Single Correct Answer)
+1
-0.3
Curves X and Y in Figure denote open circuit and full-load zero power factor (zpf) characteristics of asynchronous generator. Q is a point on the zpf characteristics at 1.0 p.u. voltage. The vertical distance PQ in Figure gives the voltage drop across GATE EE 2003 Electrical Machines - Synchronous Machines Question 73 English
A
Synchronous reactance
B
Magnetizing reactance
C
Potier reactance
D
Leakage reactance
2
GATE EE 2003
MCQ (Single Correct Answer)
+1
-0.3
A stand-alone engine driven Synchronous generator is feeding a partly inductive load. A capacitor is now connected across the load to completely nullify the inductive current. For this operating condition.
A
the field current and fuel input have to be reduced
B
the field current and fuel input have to be increased
C
the field current has to be increased and fuel input left unaltered
D
the field current has to be reduced and fuel input left unaltered
3
GATE EE 2001
MCQ (Single Correct Answer)
+1
-0.3
It is desirable to eliminate 5th harmonic voltage from the phase voltage of an alternator. The coils should be short-pitched by an electrical angle of
A
30°
B
36°
C
72°
D
18°
4
GATE EE 2001
MCQ (Single Correct Answer)
+1
-0.3
Figure shows the magnetization curves of an alternator at rated armature current, unity power factor and also at no load. The magnetization curve for rated armature current, 0.8 power factor leading is given by GATE EE 2001 Electrical Machines - Synchronous Machines Question 75 English
A
curve A
B
curve B
C
curve C
D
curve D
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