A calculations

29問 • 8ヶ月前

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The thermal efficiency and mechanical efficiency of an engine are 40% and 72%, respectively. Determine the power equivalent of the fuel used if the brake horsepower is 1.35 hp.

3.5 kW

A belt delivers a tangential force of 150 N on a half meter radius pulley at a speed of 380 rev/min. What will be the power?

3.0 kW

For a 4 inches by 4 inches centrifugal pump with discharge of 250 gpm, determine the size of the diesel engine. Efficiency of the pump is 65%, of the belt transmission is 95%, and of the air-cooled system is 80%. Total head is 30 ft.

3.8 hp

A 1000-hectare farm shall be planted with hybrid corn, with the following operations being mechanized: Operation No of Passes Maximum Number of Days Required to Complete Operation Land Preparation: Plowing 1 90 days Harrowing 2 75 days Planting 1 75 days Spraying as required Harvesting 1 90 days Other information includes: Width of cut of 3-bottom disc plows 160 cm Width of cut of disc trailing harrow 220 cm Corn planters 4-row units Corn picker-sheller 1-row unit Plowing, harrowing speed 4 kph Row spacing 1 m Field efficiency 80% Planting and harvesting speed 5 kph Estimate the number of tractors needed

250

Given the following data for a four-wheel tractor equipped with a three bottom disk plow. Mass: Tractor, kg 3800 Carried by the front wheel, kg 1600 Carried by the rear wheel, kg 2050 Wheel base, mm 3168 Drawbar dynamometer reading, kg 602 Angle between the horizontal and the line of draft 15O Assuming dynamic condition of equilibrium while plowing, calculate the weight (in kg) transferred from the front wheels if the drawbar clearance is 48 cm from the ground level and the plane 16 cm horizontally from the soil vertical reactions at the wheels. Neglect other minor forces acting on the tractor.

If money is worth 8.7% simple interest, how long (in months) from today will the value become P37,501.50 of a debt of P36,000.50 due 6 months from today?

A 4-ha field was plowed using a three-bottom 12-inch tractor-mounted moldboard plow. It took 11 hrs to complete the operation at a tractor speed of 5 kph. Find the theoretical field capacity:

0.46 ha/hr

How many times greater is the power of a carabao over man?

100

The fertility of a particular field is such that maximum corn yield is obtained with a population of 54,000 plants per hectare. A checkrow corn planter is used which discharges 2 seeds/hill. Average emergence is 85%. Row spacing = hill spacing. Find the spacing:

0.56 m

The calibration of the 9X7 (9 rows X 7 inches row spacing) grain drill is shown below. Row spacing is to be adjusted to 14 inches. Groundwheel diameter is 1.22 m. [object Object] What is the seeding rate at ¾ adjustment?

60 kg/ha

A 5-m self-propelled combine makes an average stop of 4 min every time its 2-ton grain tank is to be unloaded. Gross yield of the 20-ha field is 42 tons. The operating speed is 4.8 kph. The time for turning on the headland at the ends of the 500-m field is 15 seconds. Find the actual field capacity:

2.0 ha/hr

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: [object Object]

50 hp

The application rate of a certain chemical is recommended at 4 kg/ha. The calibration test of a 16-liter knapsack sprayer is as follows: Nozzle discharge = 1.2 liters/min, swath = 1.5 m and walking speed = 20 m/min Determine the amount of chemical to mix with water per loading:

160 gms/load

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 passings and 9 seconds turnaround time at the end of each pass. Determine the field efficiency in going the longer field direction:

83%

A 4-ha field was plowed using a three-bottom 12-inch tractor-mounted moldboard plow. It took 11 hrs to complete the operation at a tractor speed of 5 kph. Find the actual field capacity:

0.36 ha/hr

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 passings and 9 seconds turnaround time at the end of each pass. Determine actual field capacity when tilling is done along the longer field direction:

0.25 ha/hr

If the specific yield of a particular well is 3 gpm/ft drawdown and the discharge rate of the pump is 30gpm, the total drawdown is:

10 ft

A farmer figured that he needed 8 pieces 2” x 4” x 12’ and 10 pieces 2” x 3” x 12’ lumber to make tables and chairs for their barangay hall. He availed them from a newly-opened local hardware shop, named J.E.R. Hardware Supplies, which charges P25 for every board foot of lumber. However, to gain patronage, the shop gave 15% discount for the first 50 board feet of purchased lumber. How many board feet of lumber are needed for the farmer’s project?

124

How much did the farmer actually paid for his purchase?

approx. 3000 pesos

How many degrees has the crankshaft rotated if the piston has traveled 4.25 cm with respect to its top dead position in a 3.5” by 5” diesel engine?

60°

What is the depreciation factor per year of a hand tractor that is bought at P150, 000.00, if it has no more value at the end of the fifth year?

30,000 pesos/year

What is the depreciation factor per year, of a hand tractor that is bought at 60,000 Pesos, if it has no more value at the end of the fifth year?

12,000 pesos/year

What is the hand tractor’s book value after 3 years?

24,000 pesos

0.3 ha/hr

A 4-ha field was plowed using a three-bottom 12-inch tractor-mounted moldboard plow. It took 11 hrs. to complete the operation at a tractor speed of 5 kph. Find the theoretical field capacity:

0.46 ha/hr

0.56 m

Two persons are threshing by “Hampasan” method. What is the total human power generated by the two persons in one day if they work at an average of 6 hours?

0.11 hp/person; 0.22 hp

TCEP EXAM 1

Blessie Fath Raneses · 93問 · 1年前

TCEP EXAM 1