Do you use the subjunctive conjugation when asking a question?
Quieres comer? O querias comer?

Since you are not certain if the other person wants to eat, which conjugation should you use?

Question

Do you use the subjunctive conjugation when asking a question?
Quieres comer? O querias comer?

Since you are not certain if the other person wants to eat, which conjugation should you use?

Answer

In most cases we simply use the present indicative: ¿Quieres comer?

However, if you're asking for a loaf of bread in a bakery, you can choose between many different ways of saying it:
-¿Podrías darme una barra de pan? (condicional, bastante informal)
-Quiero una barra de pan (presente indicativo, informal)
-Quería una barra de pan (pretérito imperfecto,un poco formal)
-Querría una barra de pan (condicional de cortesía, formal)
-Quisiera una barra de pan (subjuntivo, formal)

Answer

La segunda conjugación que has puesto es el pretérito imperfecto de indicativo.

De todas formas, decimos ¿quieres comer?.

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