Is this a nasogastric tube? If so it should not be removed after each feed. As David says placement and ensuring it is in the correct place is very important. You do not want it being inserted into the lungs.
However if it is a Mic-key type tube then yes. A Mic-key tube is a PEG tube which is placed into the stomach through the abdomen and sits nicely on the abdomen. For each feed an extension tube is attached, through which the feed is given. After the feed this extension tube is indeed then removed.
I find it hard to believe that a competent Nurse would insert a Nasogastric tube each time the patient requires feeding.
Tammy

Caregiver/advocate to Husband Kris age 59@ diagnosis
DX Dec '10 SCC BOT T4aN2bM0 HPV+ve.Cisplatin x3 35 IMRT.
PET 6/11 clear.
R) level 2-4 neck dissection 8/1/11 to remove residual node - necrotic with NED
Feb '12 Ca back.. 3/8/12 total glossectomy/laryngectomy/bilat neck dissection/partial pharyngectomy etc. clear margins. All nodes negative for disease. PEG in.
March 2017 - 5 years disease free. Woohoo!