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1
GATE EE 2006
MCQ (Single Correct Answer)
+1
-0.3
In a $$DC$$ machine, which of the following statements is true?
A
Compensating winding is used for neutralizing armature reaction while inter pole winding is used for producing residual flux.
B
Compensating winding is used for neutralizing armature reaction while inter pole winding is used for improving commutation.
C
Compensating winding is used of improving commutation while inter pole winding is used for neutralizing armature reaction.
D
Compensating winding is used for improving commutation while inter pole winding is used for producing residual flux .
2
GATE EE 2002
MCQ (Single Correct Answer)
+1
-0.3
A dc series motor fed from rated supply voltage is overloaded and its magnetic circuit is saturated. The torque-speed characteristic of this motor will be approximately represented by which curve of Fig. GATE EE 2002 Electrical Machines - D.C Machines Question 63 English
A
Curve A
B
Curve B
C
Curve C
D
Curve D
3
GATE EE 2001
MCQ (Single Correct Answer)
+1
-0.3
In case of an armature controlled separately excited dc motor drive with closed loop speed control, an inner current loop is useful because it
A
limits the speed of the motor to a safe value
B
helps in improving the drive energy efficiency
C
limits the peak current of the motor to the permissible value
D
reduces the steady state speed error
4
GATE EE 2000
MCQ (Single Correct Answer)
+1
-0.3
The compensating winding in a dc machine
A
is located in armature slots for compensation of the armature reaction
B
is located on commutating poles for improving the commutation
C
is located on pole shoes for avoiding the flashover at the commutator surface
D
is located on poles shoes to avoid the sparking at the brushes.
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Potentiometer and Instrument Transformers Measurement of Resistance and A.C Bridges Measurement of Energy and Power Cathode Ray Oscilloscope Digital Voltmeters Questions Basic of Indicating Instruments Error Analysis and Measurement
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