An external combustion engine is to a turbine as an internal combustion engine is to:

Question

answers:

a gas tank.

a motor.

steam.

a piston.

Answer 1

An external combustion engine is to a turbine as an internal combustion engine is to a piston.

In both cases, the relationships involve engines that use combustion to produce mechanical work: external combustion engines typically use steam turbines, while internal combustion engines often operate using pistons to convert combustion energy into mechanical motion.