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]
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]
Related questions
Question
I need answer within 20 minutes please please with my best wishes
![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%2F9ba0a00e-ddb5-47b2-a870-31a1923a1034%2F69f44a87-5e32-472b-801a-642c0f70e1a8%2Fn3dod5d_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]
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 4 steps
