Section 30(3)(a) in Bihar Inland Vessels Rules, 2013
(a)be able to write a legible hand and have a good knowledge of arithmetic up to and including vulgar and decimal fractions and square root. He shall also be able to work out questions relating to spring or level loaded safety and relief valve, consumption of oils and stores capacities of tanks to bunkers, speed of vessels and other similar problem and be to calculate suitable working pressures for air received of given dimensions and the stress per square inch on crank and tunnel shafts and other parts of the machinery when the necessary data are furnished;