1
GATE EE 2017 Set 1
Numerical
+2
-0
A separately excited DC generator supplies 150 A to a 145 V DC grid. The generator is running
at 800 RPM. The armature resistance of the generator is 0.1 Ω. If the speed of the generator is
increased to 1000 RPM, the current in amperes supplied by the generator to the DC grid is
_______.
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2
GATE EE 2016 Set 1
Numerical
+2
-0
A DC shunt generator delivers 45 A at a terminal voltage of 220 V. The armature and the shunt
field resistance are 0.01 Ω and 44 Ω respectively. The stray losses are 375 W. The percentage
efficiency of the DC generator is ______.
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3
GATE EE 2015 Set 2
Numerical
+2
-0
With an armature voltage of 100 V and rated field winding voltage, the speed of a separately excited DC motor driving a fan is 1000 rpm, and its armature current is 10 A. The armature resistance is 1 Ω. The load torque of the fan load is proportional to the square of the rotor speed. Neglecting rotational losses, the value of the armature voltage (in Volt) which will reduce the rotor speed to 500 rpm is ______.
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4
GATE EE 2015 Set 1
Numerical
+2
-0
A separately excited DC motor runs at 1000 rpm on no load when its armature terminals are connected to a 200 V DC source and the rated voltage is applied to the field winding. The armature resistance of this motor is 1 Ω. The no-load armature current is negligible. With the motor developing its full load torque, the armature voltage is set so that the rotor speed is 500 rpm. When the load torque is reduced to 50% of the full load value under the same armature voltage conditions, the speed rises to 520 rpm. Neglecting the rotational losses, the full load armature current (in Ampere) is _______.
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Questions Asked from D.C Machines (Marks 2)
Number in Brackets after Paper Indicates No. of Questions
GATE EE 2018 (1)
GATE EE 2017 Set 2 (2)
GATE EE 2017 Set 1 (2)
GATE EE 2016 Set 1 (1)
GATE EE 2015 Set 2 (1)
GATE EE 2015 Set 1 (2)
GATE EE 2014 Set 3 (1)
GATE EE 2014 Set 2 (1)
GATE EE 2014 Set 1 (1)
GATE EE 2012 (1)
GATE EE 2011 (1)
GATE EE 2010 (2)
GATE EE 2009 (1)
GATE EE 2008 (2)
GATE EE 2006 (1)
GATE EE 2005 (3)
GATE EE 2004 (2)
GATE EE 2003 (1)
GATE EE 2002 (1)
GATE EE 2001 (1)
GATE EE 2000 (2)
GATE EE 1999 (1)
GATE EE 1998 (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