1
GATE EE 1999
MCQ (Single Correct Answer)
+1
-0.3
Higher synchronous reactance is preferred in the present day alternators, because one can have
A
reduced sub-transient currents
B
reduced harmonic currents
C
reduced transient currents
D
higher voltage regulation with load
2
GATE EE 1999
MCQ (Single Correct Answer)
+2
-0.6
A three phase alternator is wound with a 60 degree phase-spread armature windings and develops 300 kVA. If the armature is reconnected utilizing all the coils for single phase operation with a phase spread of 180 degrees, the new rating of the machine is
A
100 kVA
B
200 kVA
C
250 kVA
D
300 kVA
3
GATE EE 1999
Subjective
+5
-0
A charge $$+Q$$ is uniformly distributed throughout the volume of a dielectric sphere of radius $$R$$ and dielectric constant $$'{\varepsilon _R}'.$$ Based on Gauss law, determine the expressions for the electric field $$E$$ as a function of distance $$'r'$$ from the center of the sphere, within the ranges $$0 < r < R$$ and $$R \le r.$$ Indicate expression $$(s)$$ for the critical point $$(s)$$ on the sketch.
4
GATE EE 1999
MCQ (Single Correct Answer)
+1
-0.3
Two parallel wires separated by a distance $$'d'$$ are carrying a current $$'{\rm I}'$$ in the same direction. The magnetic field along a line running parallel to these wires at midway between them
A
depends upon $$'{\rm I}'$$
B
is zero
C
depends upon $$'d'$$
D
depends upon the permeability of medium between the wires.
EXAM MAP