1
GATE EE 1998
MCQ (Single Correct Answer)
+2
-0.6
The neutral of $$10$$ $$MVA,$$ $$11$$ $$kV$$ alternator is earthed through a resistance of $$5$$ ohms. The earth fault relay is set to operate at $$0.75$$ $$A.$$ The $$CT's$$ have a ratio of $$1000/5.$$ What percentage of the alternator winding is protected?
A
$$85$$%
B
$$88.2$$%
C
$$15$$%
D
$$11.8$$%
2
GATE EE 1998
MCQ (Single Correct Answer)
+1
-0.3
Bulk power transmission over long HVDC lines are preferred, on account of
A
low cost of HVDC treminals
B
no harmonic problems
C
minimum line power losses
D
simple protection
3
GATE EE 1998
MCQ (Single Correct Answer)
+2
-0.6
The Laplace transform of $$\left(t^2\;-\;2t\right)u\left(t\;-\;1\right)$$ is
A
$$\frac2{s^3}e^{-s}\;-\;\frac2{s^2}e^{-s}$$
B
$$\frac2{s^3}e^{-2s}\;-\;\frac2{s^2}e^{-s}$$
C
$$\frac2{s^3}e^{-s}\;-\;\frac1se^{-s}$$
D
None of the above
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