1
GATE EE 2022
Numerical
+1
-0.33

A 280 V, separately excited DC motor with armature resistance of 1 $$\Omega$$ and constant field excitation drives a load. The load torque is proportional to the speed. The motor draws a current of 30 A when running at a speed of 1000 rpm. Neglect frictional losses in the motor. The speed, in rpm, at which the motor will run, if an additional resistance of value 10 $$\Omega$$ is connected in series with the armature, is __________. (round off to nearest integer).

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2
GATE EE 2018
Numerical
+1
-0
A separately excited dc motor has an armature resistance R$$a$$ = 0.05⁡Ω. 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).
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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
A
GATE EE 2016 Set 1 Electrical Machines - D.C Machines Question 50 English Option 1
B
GATE EE 2016 Set 1 Electrical Machines - D.C Machines Question 50 English Option 2
C
GATE EE 2016 Set 1 Electrical Machines - D.C Machines Question 50 English Option 3
D
GATE EE 2016 Set 1 Electrical Machines - D.C Machines Question 50 English Option 4
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?
A
62.25
B
69.3
C
73.25
D
77.3
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