1
GATE EE 2013
+2
-0.6
The Voltage Source Inverter $$(VSI)$$ shown in the figure below is switched to provide a $$50$$ $$Hz,$$ square-wave $$ac$$ output voltage ($${V_0}$$) across an $$R$$-$$L$$ load. Reference polarity of $${V_0}$$ and reference direction of the output current $${I_0}$$ are indicated in the figure. It is given that $$R = 3\,\,\Omega ,\,\,L = 9.55\,\,mH.$$

In the interval when $${V_0} < 0$$ and $${i_0} > 0$$ the pair of devices which conducts the load current is

A
$$Q1,Q2$$
B
$$Q3,Q4$$
C
$$D1,D2$$
D
$$D3,D4$$
2
GATE EE 2013
+1
-0.3
A single load is supplied by a single voltage source. If the current flowing from the load to the source is $$10\angle - {150^0}$$ A and if the voltage at the load terminals is $$100\angle {60^0}$$ $$V,$$ then the
A
Load absorbs real power and delivers reactive power.
B
Load absorbs real power and absorbs reactive power.
C
Load delivers real power and delivers reactive power.
D
Load delivers real power and absorbs reactive power.
3
GATE EE 2013
+1
-0.3
The angle $$\delta$$ in the swing equation of a synchronous generator is the
A
angle between stator voltage and current
B
angular displacement of the rotor with respect to the stator.
C
angular displacement of the stator mmf with respect to a synchronously rotating axis.
D
angular displacement of an axis fixed to the rotor with respect to a synchronously rotating axis.
4
GATE EE 2013
+2
-0.6
For a power system network with $$n$$ nodes, $${Z_{33}}$$ of its bus impedance matrix is $$j0.5$$ per unit. The voltage at mode $$3$$ is $$1.3\angle - {10^0}\,\,$$ per unit. If a capacitor having reactance of $$-j3.5$$ per unit is now added to the network between node $$3$$ and the reference node, the current drawn by the capacitor per unit as
A
$$0.325\angle - {100^0}$$
B
$$0.325\angle - {80^0}$$
C
$$0.371\angle - {100^0}$$
D
$$0.433\angle - {80^0}$$
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