A self-propelled truck of total mass 25 tonnes and wheel diameter 750 mm runs on a track forwhich the resistance is 180 N per tonne. The engine develops 60 kW at its maximum speed of 2400r.p.m. and drives the axle through a gear box. Determine : 1. the time to reach full speed from reston the level if the gear reduction ratio is 10 to 1. Assume the engine torque to be constant and agearing efficiency of 94 per cent, and 2. the gear ratio required to give an acceleration of 0.15 m/s²on an up gradient of 1 in 70 assuming a gearing efficiency of 90 per cent.[Ans. 157 s ; 20.5]

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