Question: What is the power output for class 5?
SQL: SELECT "Power output (kW)" FROM "2-18217231-2" WHERE "Number in class" = 5.0;

Question: Which class has a power output larger than 700 and a class of 48?
SQL: SELECT "Class" FROM "2-18217231-2" WHERE "Power output (kW)" > 700.0 AND "Number in class" = 48.0;