1
GATE EE 2006
+2
-0.6
A generator is connected through a $$20$$ MVA, $$13.8/138$$ kV step up transformer, to a transmission line. At the receiving end of the line a load is supplied through a step down transformer of $$10$$ MVA, $$138/69$$ kV rating. A $$0.72$$ p.u. load, evaluated, on load side transformer ratings as base values of $$10$$ MVA and $$69$$ kV in load circuit, the value of the load (in per unit) in generator circuit will be
A
$$36$$
B
$$1.44$$
C
$$0.72$$
D
$$0.18$$
2
GATE EE 2004
+2
-0.6
A new generator having $${E_g} = 1.4\,\angle {30^ \circ }\,$$ pu [ equivalent to ($$1.212 +j$$ $$0.70$$)pu ] and synchronous reactance $$'{X_s}'$$ of $$1.0$$ pu on the system base, is to be connected to a bus having voltage $${V_t}$$ in the existing power system. This existing power system can be represented by Thevenin's voltage $${E_{th}} = 0.9\angle {0^ \circ }\,\,$$ pu in series with Tjhevenin's impedance $${Z_{th}} = 0.25\angle {90^ \circ }\,\,$$ pu. The magnitude of the voltage $${V_t},$$ of the system in pu will be
A
$$0.990$$
B
$$0.973$$
C
$$0.963$$
D
$$0.900$$
3
GATE EE 2001
+2
-0.6
A $$75$$ MVA, $$10$$ kV synchronous generator has Xd $$= 0.4$$ p.u. The Xd value (in p.u.) is a base of $$100$$ MVA, $$11$$ kV is
A
$$0.578$$
B
$$0.279$$
C
$$0.412$$
D
$$0.44$$
EXAM MAP
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