1
GATE EE 2015 Set 1
+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
+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
+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
+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.
GATE EE Subjects
Electric Circuits
Electromagnetic Fields
Signals and Systems
Electrical Machines
Engineering Mathematics
General Aptitude
Power System Analysis
Electrical and Electronics Measurement
Analog Electronics
Control Systems
Power Electronics
Digital Electronics
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