1
GATE EE 2000
MCQ (Single Correct Answer)
+1
-0.3
In an inverse definite minimum time, electromagnetic type over-current relay, the minimum time feature is achieved because of
A
Saturation of the magnetic circuit
B
Proper mechanical design
C
Appropriate time delay element.
D
Electromagnetic damping.
2
GATE EE 1997
MCQ (Single Correct Answer)
+1
-0.3
Reactance relay is normally preferred for protection against
A
Earth faults
B
Phase faults
C
Open-circuit faults
D
None of these
3
GATE EE 1996
MCQ (Single Correct Answer)
+1
-0.3
If the fault current is $$2000$$ A, the relay setting is $$50$$% and CT ratio is $$400:5,$$ the plug setting multiplier will be
A
$$25$$
B
$$15$$
C
$$50$$
D
$$10$$
4
GATE EE 1992
MCQ (Single Correct Answer)
+1
-0.3
A Buchholz relay is used for
A
Protection of a transformer against all internal faults
B
Protection of a transformer against external faults
C
Protection of a transformer against both internal and external faults
D
Protection of induction motors.
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