307) Which one of the following rail failures is caused by loose fish bolts at expansion joints?

308) For a 8° curve track diverging from a main curve of 5° in an opposite direction in the layout of a broad gauge yard, the cant to be provided for the branch track for maximum speed of 45 km/h on the main line and ′G′ = 1.676 m is (Permitted cant deficiency for the main line = 7.6 cm)

309) Consider the following statements: Automatic signalling system results in 1.greater risk 2.higher efficiency 3.avoidance of block instruments 4.higher operating cost Of these statements

310) Wear of rails is maximum in weight of

311) A train is hauled by 2-8-2 locomotive with 22.5 tonnes and on each driving axle. Assuming the coefficient of rail-wheel friction to be 0.25, what would be the hauling capacity of the locomotive