If you have a direct ticket from KTM to USA, no question of checking your bags again at Delhi airport. If you have  genuine papers do not worry.Thousands Indian come to USA in a day... and Indains are changing. Those indian officials even do not know what a advance Parole is. Everybody there seemed to me new... a complete overhaul in the system to corrupt one. and the guy who came forward to explain was very nice. On last August, I entered Delhi airport twice.... exited twice..... never had any hassel. Hudreds of people in queue and watching the guys checking the papers, no place and time to demand bribe .

transit time 45 minutes...not enough. First time traveller could be in trouble.