1
GATE EE 2015 Set 1
MCQ (Single Correct Answer)
+1
-0.3
Consider a $$HVDC$$ link which uses thyristor based line commutated converters as shown in the figure. For a power flow of $$750$$ $$MW$$ from System $$1$$ to System $$2,$$ the voltages at the two ends, and the current, are given by: $${V_1} = 500\,kV,\,\,{V_2} = 485\,kV\,\,$$ and $$\,{\rm I} = 1.5\,kA.\,\,$$ If the direction of power flow is to be reversed (that is, from System $$2$$ to System $$1$$) without changing the electrical connections, then which one of the following combinations is feasible?
A
$${V_1} = - 500\,kV,\,\,\,{V_2} = - 485\,kV$$ and $$\,\,\,{\rm I} = 1.5\,kA$$
B
$${V_1} = - 485\,kV,\,\,\,{V_2} = - 500\,kV$$ and $$\,\,\,{\rm I} = 1.5\,kA$$
C
$${V_1} = 500\,kV,\,\,\,{V_2} = 485\,kV$$ and $$\,\,\,{\rm I} = -1.5\,kA$$
D
$${V_1} = - 500\,kV,\,\,\,{V_2} = - 485\,kV$$ and $$\,\,\,{\rm I} = -1.5\,kA$$
2
GATE EE 2010
MCQ (Single Correct Answer)
+1
-0.3
Power is transferred from system $$A$$ to system $$B$$ by an $$HVDC$$ link as shown in the figure. If the voltage $${V_{AB}}$$ and $${V_{CD}}$$ are as indicated in the figure, and 1 > 0, then
A
$${V_{AB}}\, < \,0,\,\,{V_{CD}}\, < 0,\,\,{V_{AB}}\, > \,{V_{CD}}$$
B
$${V_{AB}}\, > \,0,\,\,{V_{CD}}\, > 0,\,\,{V_{AB}}\, < \,{V_{CD}}$$
C
$${V_{AB}}\, > \,0,\,\,{V_{CD}}\, > 0,\,\,{V_{AB}}\, > \,{V_{CD}}$$
D
$${V_{AB}}\, > \,0,\,\,{V_{CD}}\, < 0,\,\,{V_{AB}}\, > \,{V_{CD}}$$
3
GATE EE 2007
MCQ (Single Correct Answer)
+1
-0.3
Two regional system, each having several synchronous generators and loads are interconnected by an ac line and a HVDC link as shown in the figure. Which of the following statements is true in the steady state:
A
Both regions need not have the same frequency
B
The total power flow between the regions (Pac + Pdc) can be changed by controlling the HVDC converters alone
C
The power sharing between the ac line and the HVDC link can be changed by controlling the HVDC converters alone.
D
The directions of power flow in the HVDC link (Pdc) cannot be reversed.
4
GATE EE 2006
MCQ (Single Correct Answer)
+1
-0.3
An HVDC link consists of rectifier, inverter transmission line and other equipments. Which one of the following is true for this link?
A
The transmission line produce/supplies reactive power
B
The rectifier consumes reactive power and the inverter supplies reactive power from/to the respective connected consumes
C
Rextifier supplies reactive power and the inverted consumes reactive power to/from the respective connected AC systems
D
Both the converters (rectifier and inverter) consume reactive power from the respective connected AC systems.
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