1
GATE EE 2002
MCQ (Single Correct Answer)
+2
-0.6
A three phase thyristor bridge rectifier is used in a $$HVDC$$ link. The firing angle $$\alpha $$ (as measured from the point of natural commutation) is constrained to lie between $${5^ \circ }$$ and $${30^ \circ }$$. If the $$dc$$ side current and $$ac$$ side voltage magnitude are constant, which of the following statements is true (neglect harmonics in the $$ac$$ side current and commutation overlap in your analysis)
A
Reactive power absorbed by the rectifier is maximum when $$\alpha = {5^ \circ }$$
B
Reactive power absorbed by the rectifier is maximum when $$\alpha = {30^ \circ }$$
C
Reactive power absorbed by the rectifier is maximum when $$\alpha = {15^ \circ }$$
D
Reactive power absorbed by the rectifier is maximum when $$\alpha = {15^ \circ }$$
2
GATE EE 2002
MCQ (Single Correct Answer)
+1
-0.3
A six pulse thyristor rectifier bridge is connected to a balanced $$50Hz$$ three phase $$ac$$ source. Assuming that the $$dc$$ output current of the rectifier is constant, the lowest frequency harmonic component in the $$ac$$ source line current is
A
$$100$$ $$Hz$$
B
$$150$$ $$Hz$$
C
$$250$$ $$Hz$$
D
$$300$$ $$Hz$$
3
GATE EE 2002
MCQ (Single Correct Answer)
+1
-0.3
A long wire composed of a smooth round conductor runs above and parallel to the ground (assumed to be a large conducting plane). A high voltage exists between the conductor and the ground. The maximum electric stress occurs at
A
The upper surface of the conductor
B
The lower surface of the conductor
C
The ground surface
D
Midway between the conductor and ground
4
GATE EE 2002
Subjective
+5
-0
Two transposed $$3$$ phase lines run parallel to each other. The equation describing the voltage drop in both lines is given below. GATE EE 2002 Power System Analysis - Load Flow Studies Question 6 English

Compute the self and mutual zero sequence impedances of this system i.e, compute $${Z_{011}},\,\,{Z_{012}},\,\,{Z_{021}},\,\,{Z_{022}}\,\,\,$$ in the following equations.
$$\Delta {V_{01}} = {Z_{011}}\,{{\rm I}_{01}} + {Z_{012}}\,{{\rm I}_{02}}$$
$$\Delta {V_{02}} = {Z_{021}}\,{{\rm I}_{01}} + {Z_{022}}\,{{\rm I}_{02}}\,\,$$ where $$\,\Delta {V_{01}},$$
$$\Delta {V_{02}},\,{{\rm I}_{01}},\,{{\rm I}_{02}}\,\,$$ are the zero sequence voltage drops and currents for the two lines respectively.

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