The Indian-American Noshir Gowadia, a former B-2 stealth bomber engineer has been sentenced by a US federal judge to 32 years of imprisonment for selling military secrets to China.Gowadia, 66, has spent the past five years in prison. The sentencing of Mumbai-born Gowadia comes weeks after China conducted a flight test of its new J-20 stealth fighter.Prosecutors alleged that Gowadia helped design an exhaust nozzle for China that gives off less heat, making it difficult for enemy infrared detectors to track the missile for which he got 110,000 dollars over two years.