Answered on December 27,2017
NOC is a No Objection Certificate issued from the regional RTO for re-registration of a vehicle from one state to another. An NOC certifies that there are no dues of tax on the vehicle. If you are travelling to another state for less than three months and planning to take your vehicle with you, you are not required to obtain an NOC. As per the regulations, you are required to apply for a change of address and re-registration when you are going to another state for over a year. The application for change of address and re-registration needs an NOC from the local R.T.O where you got your vehicle registered.
Answered on February 12,2019
Steps to obtain NOC is represented in infographics here.