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Power System Analysis
Per Unit System
Marks 1Marks 2
Power Generation Cost
Marks 1Marks 2Marks 5
Power System Stability
Marks 1Marks 2Marks 5
Symmetrical Components and Symmetrical and Unsymmetrical Faults
Marks 1Marks 2Marks 5
Circuit Breaker
Marks 1Marks 2Marks 5
Switch Gear and Protection
Marks 1Marks 2Marks 5
Load Flow Studies
Marks 1Marks 2Marks 5
High Voltage Dc Transmission
Marks 1
Generating Power Station
Marks 1Marks 2
Parameters and Performance of Transmission Lines
Marks 1Marks 2Marks 5
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1
GATE EE 2023
MCQ (Single Correct Answer)
+1
-0.33

For the three-bus power system shown in the figure, the trip signals to the circuit breakers B$$_1$$ to B$$_9$$ are provided by overcurrent relays R$$_1$$ to R$$_9$$, respectively, some of which have directional properties also. The necessary condition for the system to be protected for short circuit fault at any part of the system between bus 1 and the R-L loads with isolation of minimum portion of the network using minimum number of directional relays is

GATE EE 2023 Power System Analysis - Switch Gear and Protection Question 1 English

A
R$$_3$$ and R$$_4$$ are directional overcurrent relays blocking faults towards bus 2
B
R$$_3$$ and R$$_4$$ are directional overcurrent relays blocking faults towards bus 2 and R$$_7$$ is directional overcurrent relay blocking faults towards bus 3
C
R$$_3$$ and R$$_4$$ are directional overcurrent relays blocking faults towards Line 1 and Line 2, respectively, R$$_7$$ is directional overcurrent relay blocking faults towards Line 3 and R$$_5$$ is directional overcurrent relay blocking faults towards bus 2
D
R$$_3$$ and R$$_4$$ are directional overcurrent relays blocking faults towards Line 1 and Line 2, respectively.
2
GATE EE 2022
MCQ (Single Correct Answer)
+1
-0.33

The most commonly used relay, for the protection of an alternator against loss of excitation, is

A
offset Mho relay.
B
over current relay.
C
differential relay.
D
Buchholz relay.
3
GATE EE 2011
MCQ (Single Correct Answer)
+1
-0.3
A negative sequence relay is commonly used to protect
A
An alternator
B
A transformer
C
A transmission line
D
A bus bar
4
GATE EE 2008
MCQ (Single Correct Answer)
+1
-0.3
A two machine power system in shown below. Transmission line $$XY$$ has positive sequence impedance of $${Z_1}\Omega $$ and zero sequence impedance of $${Z_0}\Omega $$ GATE EE 2008 Power System Analysis - Switch Gear and Protection Question 16 English
An $$'a'$$ phase to ground fault with zero fault impedance occurs at the centre of the transmission line. Bus voltage at $$X$$ and line current from $$X$$ to $$F$$ for the phase $$'a',$$ are given by $${V_a}$$ Volts and $${{\rm I}_a}$$ Amperes, respectively. Then, the impedance measured by the ground distance relay located at the terminal $$X$$ of line $$XY$$ will be given by
A
$${Z_1}/2\Omega $$
B
$${Z_0}/2\Omega $$
C
$$\left( {{Z_0} + {Z_1}} \right)/2\Omega $$
D
$${V_a}/{{\rm I}_a}\,\Omega $$
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Questions Asked from Marks 1
GATE EE 2023 (1) GATE EE 2022 (1) GATE EE 2011 (1) GATE EE 2008 (1) GATE EE 2006 (1) GATE EE 2004 (1) GATE EE 2002 (1) GATE EE 2000 (2) GATE EE 1997 (1) GATE EE 1996 (1) GATE EE 1992 (1)
GATE EE Subjects
Electromagnetic Fields
Signals and Systems
Engineering Mathematics
General Aptitude
Power Electronics
Power System Analysis
Analog Electronics
Control Systems
Digital Electronics
Electrical Machines
Electric Circuits
Electrical and Electronics Measurement