1
GATE EE 2018
Numerical
+2
-0
A 200 V DC series motor, when operating from rated voltage while driving a certain load,
draws 10 A current and runs at 1000 r.p.m. The total series resistance is 1 Ω. The magnetic
circuit is assumed to be linear. At the same supply voltage, the load torque is increased by
44%. The speed of the motor in r.p.m. (rounded to the nearest integer) is ________
Your input ____
2
GATE EE 2017 Set 1
Numerical
+2
-0
A 220 V DC series motor runs drawing a current of 30 A from the supply. Armature and field
circuit resistances are 0.4 Ω and 0.1 Ω respectively. The load torque varies as the square of the
speed. The flux in the motor may be taken as being proportional to the armature current. To
reduce the speed of the motor by 50% the resistance in ohms that should be added in series with
the armature is _________.
Your input ____
3
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
_______.
Your input ____
4
GATE EE 2017 Set 2
Numerical
+2
-0
A 120 V DC shunt motor takes 2 A at no load. It takes 7 A on full load while running at 1200
rpm. The armature resistance is 0.8 Ω, and the shunt field resistance is 240 Ω. The no load
speed, in rpm, is _________.
Your input ____
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 1 (2)
GATE EE 2017 Set 2 (2)
GATE EE 2016 Set 1 (1)
GATE EE 2015 Set 1 (2)
GATE EE 2015 Set 2 (1)
GATE EE 2014 Set 1 (1)
GATE EE 2014 Set 3 (1)
GATE EE 2014 Set 2 (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