The Nikkei Markit India Manufacturing Purchasing Managers' Index (PMI) -- an indicator of manufacturing activity -- matched March's reading of 52.5.
Though the upturn in order books was "most pronounced" since last October and new export orders rose for the third month in a row, the rate of expansion eased from March.
April is the fourth straight month in which manufacturing sector registered growth after the demonetisation-induced contraction at the end of 2016.
"Buoyant domestic demand coupled with sustained growth of new orders from abroad boosted the upturn in total new business received by Indian manufacturers in April," said Pollyanna De Lima, Economist at IHS Markit and author of the report.
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On inflation, it said purchasing costs increased for the 19th consecutive month in April. Meanwhile, less than 5 per cent of manufacturers raised their output prices in April, while almost 93 per cent signalled no change.
The Reserve Bank in its monetary policy review meet on April 6 kept the repurchase or repo rate -- at which it lends to banks -- unchanged at 6.25 per cent but increased reverse repo rate to 6 per cent from 5.75 per cent.
Lima further noted that Indian manufacturer believe output is expected to remain on an upward trajectory amid reports of planned capacity expansions, new product launches, aggressive marketing campaigns and an improving economic scenario.
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