NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF AGRICULTURAL SCIENCE
JANUARY/FEBRUARY 2013 EXAMINATION

B.Sc Agricultural Extension and Management

AGM 314: AGRICULTURE MECHANIZATION (2 Credit Units)

ANSWER ANY 4 QUESTIONS (20 Marks each)

TIME: 2 HOURS

1a. Define these terms: Farm Mechanization, Mechanical Advantage, Velocity Ratio, and    Efficiency

1b. Explain how an incline plane and gears work

1c. an inclined plane at an angle of 300 to the horizontal is used as a simple machine. A force E is used to push a load of 120N uniformly up the plane at efficiency of 50%.

 Determine:

i) Its velocity ratio

ii) The magnitude of E

2a. what are the following tools use for in agricultural mechanisation farm?

 Centre Punch, Hack Saw, Vernier Caliper, Protractor and Scriber

2b. what is a cycle? Describe the operation of the 4-stroke Cycle

3a what is Secondary Tillage?

3b. List the objectives of Secondary tillage

3c. Explain the following terms:

      Zero tillage, Minimum tillage and Maximum tillage

4a. with the aid of open drive system describe power transmission through belting.

4b. the pulley on a machine is 250mm diameter. It is to be driven at 183rev/min. A Main-shaft to drive the machine has a pulley of diameter 120mm. what is the speed of the running shaft to drive the machine?

5a. what are the purpose of gears in power transmission?

5b. Name the kind of gears commonly use in the farm.

5c. why is tractor in bottom gear can pull heavier loads than when the tractor is in top gear?

5d. what is the speed ratio for gears?

6a. briefly explain the functions of combine harvester and sprayer

6b. what are the necessary guidelines for joint machinery ownership in farm management?

6c. what are the components of fixed and variable cost?