A self-propelled truck of total mass 25 tonnes and wheel diameter 750 mm runs on a track for which the resistance is 180 N per tonne. The engine develops 60 kW at its maximum speed of 2400 r.p.m. and drives the axle through a gear box. Determine : 1. the time to reach full speed from rest on the level if the gear reduction ratio is 10 to 1. Assume the engine torque to be constant and a gearing efficiency of 94 per cent, and 2. the gear ratio required to give an acceleration of 0.15 m/s²
A self-propelled truck of total mass 25 tonnes and wheel diameter 750 mm runs on a track for which the resistance is 180 N per tonne. The engine develops 60 kW at its maximum speed of 2400 r.p.m. and drives the axle through a gear box. Determine : 1. the time to reach full speed from rest on the level if the gear reduction ratio is 10 to 1. Assume the engine torque to be constant and a gearing efficiency of 94 per cent, and 2. the gear ratio required to give an acceleration of 0.15 m/s²
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![A self-propelled truck of total mass 25 tonnes and wheel diameter 750 mm runs on a track for
which the resistance is 180 N per tonne. The engine develops 60 kW at its maximum speed of 2400
r.p.m. and drives the axle through a gear box. Determine : 1. the time to reach full speed from rest
on the level if the gear reduction ratio is 10 to 1. Assume the engine torque to be constant and a
gearing efficiency of 94 per cent, and 2. the gear ratio required to give an acceleration of 0.15 m/s²
on an up gradient of 1 in 70 assuming a gearing efficiency of 90 per cent.
[Ans. 157 s ; 20.5]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe1a1ae11-978a-4ec8-81f2-6ad8cf3a393b%2F2db952e9-6cce-4696-b9f1-ea572b79c810%2F93g5sa6_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A self-propelled truck of total mass 25 tonnes and wheel diameter 750 mm runs on a track for
which the resistance is 180 N per tonne. The engine develops 60 kW at its maximum speed of 2400
r.p.m. and drives the axle through a gear box. Determine : 1. the time to reach full speed from rest
on the level if the gear reduction ratio is 10 to 1. Assume the engine torque to be constant and a
gearing efficiency of 94 per cent, and 2. the gear ratio required to give an acceleration of 0.15 m/s²
on an up gradient of 1 in 70 assuming a gearing efficiency of 90 per cent.
[Ans. 157 s ; 20.5]
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