An airport official said the smoke, which was seen inside the complex at around 7.20 pm, triggered panic but fizzled out in another five minute's time.
A fire tender rushed to the terminal building at around 7.45 pm but did not have to intervene.
The smoke, which came off a Goods X ray machine, was believed to have been caused by a sudden short circuit.
The developments did not cause any disruption in flight movement or inconvenienced the air passengers, the official said.