Here are some examples:
* Quel est votre nom? (What is your name?)
* Quel livre préférez-vous? (Which book do you prefer?)
* Quel est le problème? (What is the problem?)
It's important to note that "quel" is used before masculine singular nouns. For feminine singular nouns, the word "quelle" is used. For plural nouns, the word "quels" (masculine) or "quelles" (feminine) is used.