The United States will provide four large military transport planes to evacuate some of the East Pakistan refugees who are concentrated in the overcrowded Tripura border area in India, the State Department said yesterday. They will be moved to other areas in India, which had asked for the assistance.

The United States is also considering a substantial increase in its assistance, through the United Nations, to the feeding and care of Pakistani refugees In India, a spokesman said .

The amount may be about $15 million, or about half the estimated cost of feeding the refugees during the next three months.

In another development, the spokesman said the U.S. embassy in Islamabad has been instructed to ask the Pakistan government about a newspaper photograph showing military personnel using a type of small boat similar to 50 craft supplied by the United States for cyclone disaster relief operations last fall. The vessel was apparently being used in an area where government forces were fighting East Pakistani separatists.

In New York, Catholic Relief Services announced yesterday that it is shipping 60,000 doses of cholera vaccine to Calcutta to combat an epidemic among the East Pakistan refugees in India.