The capacity of an OTG (Oven, Toaster, and Griller) required to bake a 1 kg cake can vary depending on the recipe and the size of the baking pan you plan to use. However, a general guideline is to use an OTG with a capacity of at least 25 liters (or 0.9 cubic feet).
This capacity allows for adequate airflow and heat distribution within the oven, ensuring even baking of the cake. It also provides enough space for the cake to rise without touching the top heating element. Keep in mind that different OTG models may have slightly different specifications, so it's always a good idea to consult the manufacturer's guidelines for the specific model you're using.
When baking a 1 kg cake, make sure to adjust the recipe ingredients accordingly, as baking times and temperatures may vary. It's also essential to preheat the OTG to the recommended temperature specified in the cake recipe for best results.