1
GATE EE 2023
Numerical
+1
-0.33
A separately excited DC motor rated 400 V, 15 A, 1500 RPM drives a constant torque load at rated speed operating from 400 V DC supply drawing rated current. The armature resistance is 1.2 $$\Omega$$. If the supply voltage drops by 10% with field current unaltered then the resultant speed of the motor in RPM is ____________ (Round off to the nearest integer).
Your input ____
2
GATE EE 2018
Numerical
+1
-0
A separately excited dc motor has an armature resistance R$$a$$ = 0.05Ω. The field excitation
is kept constant. At an armature voltage of 100 V, the motor produces a torque of 500 Nm
at zero speed. Neglecting all mechanical losses, the no-load speed of the motor (in radian/s)
for an armature voltage of 150 V is _____ (up to 2 decimal places).
Your input ____
3
GATE EE 2016 Set 1
MCQ (Single Correct Answer)
+1
-0.3
A 4-pole, lap-connected, separately excited dc motor is drawing a steady current of 40 A while
running at 600 rpm. A good approximation for the waveshape of the current in armature
conductor of the motor is given by
4
GATE EE 2015 Set 1
MCQ (Single Correct Answer)
+1
-0.3
A separately excited DC generator has an armature resistance of 0.1 $$\Omega$$ and negligible armature inductance. At rated field current and rated rotor speed, its open-circuit voltage is 200 V. When this generator is operated at half the rated speed, with half the rated field current, an un-charged 1000 μF capacitor is suddenly connected across the armature terminals. Assume that the speed remains unchanged during the transient. At what time (in microsecond) after the capacitor is connected will the voltage across it reach 25 V?
Questions Asked from D.C Machines (Marks 1)
Number in Brackets after Paper Indicates No. of Questions
GATE EE 2023 (3)
GATE EE 2018 (1)
GATE EE 2016 Set 1 (1)
GATE EE 2015 Set 1 (1)
GATE EE 2015 Set 2 (2)
GATE EE 2014 Set 3 (1)
GATE EE 2011 (1)
GATE EE 2007 (1)
GATE EE 2006 (1)
GATE EE 2002 (1)
GATE EE 2001 (1)
GATE EE 2000 (3)
GATE EE 1999 (1)
GATE EE 1996 (3)
GATE EE 1995 (1)
GATE EE 1993 (1)
GATE EE 1992 (1)
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