1
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.
2
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
3
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 15 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
$${V_a}/{{\rm I}_a}\,\Omega $$
4
GATE EE 2006
MCQ (Single Correct Answer)
+1
-0.3
In a biased differential relay the bias is defined as a ratio of
A
Number of turns of restraining and operating coil
B
Operating coil current and restraining coil current
C
Fault current and operating coil current
D
Fault current and restraining coil current
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