Investment activity is gaining momentum and the envisaged capital expenditure is set to jump by over 80 per cent to Rs 1.71 lakh crore in the current fiscal, according to an article by Reserve Bank of India (RBI) staffers. The article by Shreya Bhan, Rajendra N Chavhan and Rajesh B Kavediya, which was published on Thursday, said improvement in capacity utilisation of the manufacturing sector, pick-up in credit demand and improving consumer sentiments are helping the capex cycle.