A: NO. There are two ways of installing emitters on drip lines. (1) They can be placed underground off of the mainline and then the drip line is installed on top of them, or (2) they are installed on the ends of the drip line.
Do NOT place an emitter on the end of the line unless water is spraying out like a hose! When the water is dripping out of the line it is doing it's job. If the plant is looking dehydrated and droopy then it may need more water. The size of the emitter can be changed to allow for more water to be distributed to the plant.