1
GATE EE 2021
Numerical
+2
-0
A belt-driven DC shunt generator running at 300 rpm delivers 100 kW to a 200 V DC grid. It continues to run as a motor when the belt breaks, taking 10 kW from the DC grid. The armature resistance is $0.025 \Omega$, field resistance is $50 \Omega$ and brush drop is 2 V . Ignoring armature reaction, the speed of the motor is _________ rpm. (Round off to 2 decimal places.)
Your input ____
2
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 ____
3
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 ____
4
GATE EE 2017 Set 2
MCQ (Single Correct Answer)
+2
-0.6
A 220 V, 10 kW, 900 rpm separately excited DC motor has an armature resistance Ra= 0.02 Ω.
When the motor operates at rated speed and with rated terminal voltage, the electromagnetic
torque developed by the motor is 70 Nm. Neglecting the rotational losses of the machine, the
current drawn by the motor from the 220 V supply is
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