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Electrical Machines
Induction Machines
Marks 1Marks 2
D.C Machines
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Synchronous Machines
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Transformers
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1
GATE EE 2007
MCQ (Single Correct Answer)
+1
-0.3
A three phase synchronous motor connected to ac mains is running at full load and unity power factor. If its shaft load is reduced by half, with field current held constant, its new power factor will be
A
unity
B
leading
C
lagging
D
dependent on machine parameters
2
GATE EE 2006
MCQ (Single Correct Answer)
+1
-0.3
A synchronous generator is feeding a zero power factor (lagging) load at rated current the armature reaction is
A
magnetizing
B
demagnetizing
C
cross magnetizing
D
Ineffective
3
GATE EE 2005
MCQ (Single Correct Answer)
+1
-0.3
In relation to the synchronous machines, which one of the following statements is false?
A
In salient pole machines, the direct-axis synchronous reactance is greater than the quadrature-axis synchronous reactance
B
The damper bars help the synchronous motor self-start
C
Short circuit ratio is the ratio of the field current required to produce the rated voltage on open circuit to the rated armature current
D
The V-curve of a synchronous motor represents the variation in the armature current with field excitation, at a given output power
4
GATE EE 2004
MCQ (Single Correct Answer)
+1
-0.3
The following motor definitely has a permanent magnet rotor
A
DC commutator motor
B
Brushless dc motor
C
Stepper motor
D
Reluctance motor
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Questions Asked from Marks 1
GATE EE 2025 (2) GATE EE 2018 (1) GATE EE 2017 Set 1 (1) GATE EE 2017 Set 2 (1) GATE EE 2014 Set 3 (1) GATE EE 2014 Set 1 (1) GATE EE 2011 (1) GATE EE 2008 (2) GATE EE 2007 (1) GATE EE 2006 (1) GATE EE 2005 (1) GATE EE 2004 (2) GATE EE 2003 (2) GATE EE 2001 (3) GATE EE 2000 (1) GATE EE 1999 (1) GATE EE 1998 (1) GATE EE 1996 (2) GATE EE 1995 (1) GATE EE 1992 (2)
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