1
GATE EE 2015 Set 2
Numerical
+2
-0
With an armature voltage of 100 V and rated field winding voltage, the speed of a separately excited DC motor driving a fan is 1000 rpm, and its armature current is 10 A. The armature resistance is 1 Ω. The load torque of the fan load is proportional to the square of the rotor speed. Neglecting rotational losses, the value of the armature voltage (in Volt) which will reduce the rotor speed to 500 rpm is ______.
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2
GATE EE 2015 Set 2
Numerical
+2
-0
Two three-phase transformers are realized using single-phase transformers as shown in the figure. GATE EE 2015 Set 2 Electrical Machines - Transformers Question 69 English The phase difference (in degree) between voltages V1 and V2 is _______.
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3
GATE EE 2015 Set 2
MCQ (Single Correct Answer)
+2
-0.6
A balanced (positive sequence) three-phase AC voltage source is connected to a balanced, star connected load through a star-delta transformer as shown in the figure. The line-to-line voltage rating is 230 V on the star side, and 115 V on the delta side. If the magnetizing current is neglected and $${\overline{\mathrm I}}_\mathrm s=100\angle0^\circ$$, then what is the value of $${\overline{\mathrm I}}_\mathrm p$$ in Ampere? GATE EE 2015 Set 2 Electrical Machines - Transformers Question 68 English
A
50$$\angle30^\circ$$
B
50$$\angle-30^\circ$$
C
50$$\sqrt3\angle30^\circ$$
D
200$$\angle30^\circ$$
4
GATE EE 2015 Set 2
MCQ (Single Correct Answer)
+2
-0.6
A three-winding transformer is connected to an AC voltage source as shown in the figure. The number of turns are as follows: N1=100, N2=50, N3=50. If the magnetizing current is neglected, and the currents in two windings are $${\overline I}_2=2\angle30^\circ$$ A and $${\overline I}_3=2\angle30^\circ$$ A, then what is the value of the current $${\overline I}_1$$ in Ampere? GATE EE 2015 Set 2 Electrical Machines - Transformers Question 66 English
A
$$1\angle90^\circ$$
B
$$1\angle270^\circ$$
C
$$4\angle90^\circ$$
D
$$4\angle270^\circ$$
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