Review Questions - for Machines PDF

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REVIEW How many hectares can be plowed in one hour by a tractor operating at 5 kph and is pulling 3 moldboard plows with a total width of cut of 160 cm at a depth of 14 cm? (Ans. 0 ha/h) What is the total draft in kilogram pull if there is a draft of 0 kg/cm 2? (Ans. 1008 kg)How many hectares can be...

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REVIEW #3 1. How many hectares can be plowed in one hour by a tractor operating at 5 kph and is pulling 3 moldboard plows with a total width of cut of 160 cm at a depth of 14 cm? (Ans. 0.80 ha/h)

What is the total draft in kilogram pull if there is a draft of 0.45 kg/cm2? (Ans. 1008 kg)

How many hectares can be plowed in 3 hours if 8% of the time is spent on headland turning? (Ans. 2.208 ha)

2. A farmer uses a hand tractor with 20 cm moldboard plow. How many kilometers must he walk to plow one hectare? (Ans. 50 km)

3. If he overlaps each pass by 10%, how many kilometers more will he have to walk to plow one hectare? (Ans. 5.56 km)

4. A 4-wheel tractor with 3X14 inches moldboard plow is to operate on clay loam soil (specific draft = 0.56 kg/cm2) at a depth of 25.4 cm. The maximum draft and percent increase in draft due to speed are:

Determine the tractor horsepower required to perform the operation: a. 55 hp b. 60 hp c. 65 hp d. 70 hp

5. A field measuring 45 m X 90 m is to be prepared using a 1-m upland power tiller at a speed of 3 kph. Assume a 10% overlap between passing and 9 seconds turn around time at the end of each pass. Determine the theoretical field capacity: a. 0.25 ha/hr b. 0.3 ha/hr c. 0.35 ha/hr d. 0.4 ha/hr

6. A farmer using a 4-bottom 41-cm moldboard plow at 6.5 km/hr covers 8 ha in 9.5 hrs. The draft is 15 kN, compute the field efficiency and drawbar power.(79%, 27.083 kW)...