Is a 16 x 17 cage suitable for budgie?

No, a 16 x 17 cage is not suitable for a budgie. Budgies need a lot of space to fly and exercise, and a cage this size would be too small for them. A good rule of thumb is to provide a cage that is at least 18 inches long, 18 inches wide, and 18 inches high for a single budgie. If you are planning to keep multiple budgies, you will need a cage that is even larger.