Given the task definition and input, reply with output. The goal of this task is to translate questions in English into Catalan. The requirements of the translation is that: the text must be equivalent in meaning, the text must not be ambiguous, and the text must be written as a question

What type of heating element is often used in toy steam engines?

Quin tipus d’element de calor s’utilitza sovint a les màquines de vapor de joguina?