SOLVING FARM POWER Flashcards
An ordinary gasoline engine uses about 0.4kg fuel/kw-hr. What is the approximate thermal efficiency?
19%
A diesel engine burns 0.25kg of fuel/kw-hr. What is the approximate thermal efficiency?
35%
Determine the drawbar power required to pull a plow with a 3-14in bottom at a rate of 3.5mph if the unit draft is 8psi of furrow section and depth of cut is 7in.
21.95
What is the piston displacement for a 10cm x 15cm engine with 4 cylinders?
4712cm^3
How much power can a horse deliver if it is continuously pulling 120lb load for several hours and walking at a rate of 2.5mph?
0.8hp
It is the ratio of the volume of distilled water to the volume of chemically pure, concentrated sulfuric acid in a lead-acid cell.
5:2
Calculate the theoretical power available from a stream using the following data: average width - 12ft, average depth - 2ft, speed -15ft/min. height of drop -4ft.
2.7hp
What is the compression rate of a 2 stroke cycle 3” x 4” engine if the clearance volume is 5in^3. The speed of operation is 1000rpm.
6.7
Calculate the location of the center of gravity of 7800-lb tractor with respect to the rear axle if the wheelbase is 90in. The static weight on the front wheels is 2300lb.
26.5”
A tractor with a 9-in pulley is belted to a prony brake having a 24-in pulley. If the tractor engine pulley speed is 950rpm, the brake arm is 54in, and the net load is 60lb, what is the hp developed?
18.3
