How much liquid jaggery equals 1 cup jaggery powder

It can range on the size of the lemon and the time of year. A medium lemon will give 2-3 Tablespoons of juice, where a larger lemon can give 1/4 cup (4 Tablespoons). Just have to decide on much lemon flavor you want in your recipe as to which number you pick.

The most common global standard for recipe and marketing purposes** is 150 ml (5 oz), with a caffeine content around 100 mg. This commonly refers to instant, filter, or drip coffee, or a mixed espresso coffee like a latte

Coffee is traditionally served in a smaller cup than other hot beverages, mainly due to strength and expense. For example, an Italian espresso cup is around 30 to 60 ml (1 to 2 oz) in size, with a caffeine content a little more then 100 mg

Some references

1. http://www.ico.org/caffeine.asp
2. http://www.scaa.org/?page=resources&d=cupping-standards

** e.g. marketing description of a "6 cup coffee maker" refers to 6 x 150 ml cups