$\backslash$table$[[125,$A $30$ MVA, $15\mathrm{.}2$ KV alternator with solidly grounded neutral has a sub$-$transient reactance of $0\mathrm{.}4$ p$.$u$.$ The negative and zero sequence reactance are $0\mathrm{.}22$ and $0\mathrm{.}25$ p$.$u$.$ respectively. A line$-$to$-$line fault occurs at the terminals of the alternator. Evaluate the fault current and line$-$to$-$line voltages.$],[126,$Three similar alternators of $20$ MVA, $15\%$ reactance are connected to separate bus sections. Three reactors each of $7\%$ reactance $($on $20$ MVA base$)$ are connected between a tie bar and generator bus sections. Find the fault MVA for a fault on bus section of generator $1.],[127,$Assess the difference between directional and non$-$directional protection as applicable for a double circuit line with the help of a suitable diagram.$]]$