Power Systems
The skin effect shows that

 current density is more at the centre of the condutor
 current density is lower at the surface of the condutor
 current density is more at the surface of the condutor
 the distribution of AC current is uniform through the cross section of the conductor

ANSWER DOWNLOAD EXAMIANS APP

Power Systems
A lossless power system has to serve a load of 250 MW. There are two generators(G1 and G2) in the system with cost curves C1 and C2 respectively defined as follows: C1 = PG1+0.055P²G1 C2 = 3 PG2 + 0.03 P²G2 Where PG1 and PG2 are the MW injections from generators G1 and G2 respectively. Thus, the minimum cost dispatch will be

 PG1 = 0 MW and PG2 = 250 MW
 PG1 = 250 MW and PG2 = 0 MW
 PG1 = 150 MW and PG2 = 100 MW
 PG1 = 100 MW and PG2 = 150 MW

ANSWER DOWNLOAD EXAMIANS APP

Power Systems
The value of off diagonal elements is

 sum of admittances connected at bus j
 sum of admittances connected at bus i
 which is connected between bus i and bus j with negative sign
 which is connected between bus i and bus j with positive sign

ANSWER DOWNLOAD EXAMIANS APP