1
GATE EE 2014 Set 1
Numerical
+2
-0
A 15kW, 230V dc shunt motor has armature circuit resistance of 0.4 $$\Omega$$ and field circuit resistance of 230 $$\Omega$$. At no load and rated voltage, the motor runs at 1400 rpm and the line current drawn by the motor is 5 A. At full load, the motor draws a line current of 70 A. Neglect armature reaction. The full load speed of the motor in rpm is ________________
Your input ____
2
GATE EE 2012
MCQ (Single Correct Answer)
+2
-0.6
A 220 V, 15 kW, 1000 rpm shunt motor with armature resistance of 0.25 Ω , has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is
A
18.18% increase
B
18.18% decrease
C
36.36% increase
D
36.36% decrease
3
GATE EE 2011
MCQ (Single Correct Answer)
+2
-0.6
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 $$\Omega$$ and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be
A
1.79 $$\Omega$$
B
2.1 $$\Omega$$
C
3.1 $$\Omega$$
D
18.9 $$\Omega$$
4
GATE EE 2010
MCQ (Single Correct Answer)
+2
-0.6
A separately excited DC motor runs at 1500 rpm under no-load with 200 V applied to the armature. The field voltage is maintained at its rated value. The speed of the motor, when it delivers a torque of 5 Nm, is 1400 rpm as shown in the figure. The rotational losses and armature reaction are neglected. GATE EE 2010 Electrical Machines - D.C Machines Question 38 English The armature resistance of the motor is,
A
$$2\;\Omega$$
B
$$3.4\;\Omega$$
C
$$4.4\;\Omega$$
D
$$7.7\;\Omega$$
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