1
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 37 English For the motor to deliver a torque of 2.5 Nm at 1400 rpm the armature voltage to be applied is
A
125.5 V
B
193.3 V
C
200 V
D
241.7 V
2
GATE EE 2009
MCQ (Single Correct Answer)
+2
-0.6
Figure shows the extended view of a $$2$$ pole $$dc$$ machine with $$10$$ armature conductors. Normal brush positions are shown by $$A$$ and $$B,$$ placed at the inter polar axis. If the brushes are now shifted, in the direction of rotation to $$A'$$ and $$B'$$ as shown, the voltage waveform $${V_{A'B'}}$$ will resemble GATE EE 2009 Electrical Machines - D.C Machines Question 5 English
A
GATE EE 2009 Electrical Machines - D.C Machines Question 5 English Option 1
B
GATE EE 2009 Electrical Machines - D.C Machines Question 5 English Option 2
C
GATE EE 2009 Electrical Machines - D.C Machines Question 5 English Option 3
D
GATE EE 2009 Electrical Machines - D.C Machines Question 5 English Option 4
3
GATE EE 2008
MCQ (Single Correct Answer)
+2
-0.6
A $$240V$$ $$dc$$ shunt motor draws $$15A$$ while supplying the rated load at a speed of $$80$$ $$rad/s$$. The armature resistance is $$0.5$$ $$ohm$$ and the field winding resistance is $$80$$ $$ohm.$$

The net voltage across the armature resistance at the time of plugging will be

A
$$6V$$
B
$$234$$ $$V$$
C
$$240$$ $$V$$
D
$$474$$ $$V$$
4
GATE EE 2008
MCQ (Single Correct Answer)
+2
-0.6
A $$240V$$ $$dc$$ shunt motor draws $$15A$$ while supplying the rated load at a speed of $$80$$ $$rad/s$$. The armature resistance is $$0.5$$ $$ohm$$ and the field winding resistance is $$80$$ $$ohm.$$

The external resistance to be added in the armature circuit to limit the armature current to $$125\% $$ of its rated value is

A
$$31.1$$ $$ohm$$
B
$$31.9$$ $$ohm$$
C
$$15.1$$ $$ohm$$
D
$$15.9$$ $$ohm$$
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