1
GATE EE 2003
+1
-0.3
The interrupting time of a circuit breaker is the period between the instant of
A
Initiation of short circuit and the arc extinction on an opening operation
B
Energizing of the trip circuit and the arc extinction on an opening operation
C
Initiation of short circuit and the parting of primary arc contacts
D
Energizing of the trip circuit and the parting of primary arc contacts
2
GATE EE 2003
+2
-0.6
A list of relays and the power system components protected by the relays are given in List-$${\rm I}$$ and List-$${\rm II}$$ respectively. Choose the correct match from the four choices given below

List-$${\rm I}$$
$$A.$$ Distance relay
$$B.$$ Under frequency relay
$$C.$$ Differential relay
$$D.$$ Buchholz relay

List-$${\rm II}$$
$$1.$$ Transformers
$$2.$$ Turbines
$$3.$$ Busbars
$$4.$$ Shunt capacitors
$$5.$$ Alternators
$$6.$$ Transmission lines

A
$$A = 6,\,B = 5,\,C = 3,\,D = 1$$
B
$$A = 4,\,B = 3,\,C = 2,\,D = 1$$
C
$$A = 5,\,B = 2,\,C = 1,\,D = 6$$
D
$$A = 6,\,B = 4,\,C = 5,\,D = 3$$
3
GATE EE 2003
+1
-0.3
A power system consists of $$300$$ buses out of which $$20$$ buses are generator buses, $$25$$ buses are the ones with reactive power support and $$15$$ buses are the ones with fixed shunt capacitors. All the other buses are load buses. It is proposed to perform a load flow analysis for the system using Newton-Raphson method. The size of the Newton-Raphson Jacobian matrix is
A
$$553 \times 553$$
B
$$540 \times 540$$
C
$$555 \times 555$$
D
$$554 \times 554$$
4
GATE EE 2003
+2
-0.6
The bus impedance matrix of a $$4$$-bus power system is given by $${Z_{bus}} = \left[ {\matrix{ {j0.3435} & {j0.2860} & {j0.2723} & {j0.277} \cr {j0.2860} & {j0.3408} & {j0.2586} & {j0.2414} \cr {j0.2723} & {j0.2586} & {j0.2791} & {j0.2209} \cr {j0.2277} & {j0.2414} & {j0.2209} & {j0.2791} \cr } } \right]$$\$

A branch having an impedance of $$j0.2\Omega$$ is connected between bus $$2$$ and the reference. Then the values of $${Z_{22,new}}$$ and $${Z_{23,new}}$$ of the bus impedance matrix of the modified network are respectively

A
$$j0.5408\,\Omega \,\,\,$$ and $$\,\,\,j0.4586\,\Omega$$
B
$$j0.1260\,\Omega \,\,\,$$ and $$\,\,\,j0.0956\,\Omega$$
C
$$j0.5408\,\Omega \,\,\,$$ and $$\,\,\,j0.0956\,\Omega$$
D
$$j0.1260\,\Omega \,\,\,$$ and $$\,\,\,j0.1630\,\Omega$$
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