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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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GATE EE Subjects
Electric Circuits
Three Phase Circuits Transient Response Graph Theory Two Port Networks Sinusoidal Steady State Analysis Network Elements Network Theorems
Electromagnetic Fields
Time Varying Fields Electrostatics Magnetostatics
Signals and Systems
Linear Time Invariant Systems Continuous and Discrete Time Signals Continuous Time Signal Fourier Transform Continuous Time Periodic Signal Fourier Series Discrete Time Signal Z Transformation Miscellaneous Continuous Time Signal Laplace Transform Sampling Theorem
Electrical Machines
Induction Machines D.C Machines Synchronous Machines Transformers
Engineering Mathematics
Linear Algebra Differential Equations Calculus Probability and Statistics Numerical Methods Vector Calculus Transform Theory Complex Variable
General Aptitude
Verbal Ability Logical Reasoning Numerical Ability
Power System Analysis
Per Unit System Power Generation Cost Power System Stability Symmetrical Components and Symmetrical and Unsymmetrical Faults Circuit Breaker Switch Gear and Protection Load Flow Studies High Voltage Dc Transmission Generating Power Station Parameters and Performance of Transmission Lines
Electrical and Electronics Measurement
Error Analysis and Measurement Basic of Indicating Instruments Potentiometer and Instrument Transformers Measurement of Resistance and A.C Bridges Measurement of Energy and Power Digital Voltmeters Questions Cathode Ray Oscilloscope
Analog Electronics
Diode Circuits and Applications Bjt and Mosfet Biasing Small Signal Modeling Feedback Amplifiers and Oscillator Circuits Operational Amplifier Frequency Response 555 Timer
Control Systems
Time Response Analysis Block Diagram and Signal Flow Graph Polar Nyquist and Bode Plot State Variable Analysis Root Locus Techniques Basics of Control System Routh Hurwitz Stability Controller and Compensator
Power Electronics
Choppers and Commutation Techniques Single and Three Phase Rectifier Power Semiconductor Devices Ac Voltage Controllers Inverters
Digital Electronics
Sequential Circuits Microprocessor Boolean Algebra Analog to Digital and Digital to Analog Converter Combinational Circuits Minimization Logic Families and Memories Logic Gates
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