Time allowed: Three Hours Maximum Marks: 200
Candidates should attempt questions 1 and 2 which are compulsory, and any
THREE of the following questions selecting at least ONE questions from each section.
SECTION A
1.
Answer any FOUR of the following each not
exceeding 150 words:
(a)
A tractor weighing 1600 kg is climbing up a
slope of 10.05 per cent with a drawbar pull of 274.1 kg parallel to the slope.
The travel speed along the slope is 3 kmph and the coefficient of rolling
resistance is one per cent. Determine the power required for moving up of the
tractor.
(b)
A cultivator’s ahs a draft of 270 kg and
operating speed of 5 kilometers per hour. Total width of the cultivators is 180
cm and its field efficiency is 80 per cent. Calculate the following :
(i)
Horsepower
(ii)
Time to till one hectare.
(c)
Write general energy equation. With specific
reference to internal combustion engines, find an expression for energy change
of a constant volume process.
(d)
Define or explain briefly the following :
(i)
Torque rise
(ii)
Power factor
(e)
Write down the following :
(i)
Minimum wind velocity for working of a windmill.
(ii)
Material used to make solar cells
(iii)
Upper safe exposure level to noise for
continuous operations
(iv)
Furrow opener suitable for mulching
(v)
Main combustible constituent of biogas
2.
(a)
Describe type of furrow cross-sections obtained while using:
(i)
Mouldboard ploughs
(ii)
Disk ploughs
(iii)
Indigenous ploughs
(b) Explain with the help of a diagram, the working principle of fuel
supply. Write importance of a fuel mixture and air cleaner.
(C) Describe some common motor troubles and their remedies. Give points
of considerations for the selection of electric motors.
3.
(a) Suggest improved farm machines to harvest
(i) Maize (ii) Wheat, (iii) Potato (iv) Napier grass, (v) Lucern, (vi) Jowar (Sorghum). Explain the reasons
for your recommendations.
(b)
Explain with the help of a diagram the working principles of fuel supple. Write
importance of a fuel mixture and air cleaner.
(C) With a neat sketch, describe
the construction of a DC generator. How does it differ from that of a DC motor?
4.
(a) Describe various devices used in seed
metering. How is the seed metered in –
(i)
A seed drill;
(ii)
A planter;
(iii)
The seeding attachment of the cultivator?
(b) A farmer has to harvest 2.5 hectares of
grass by means of a 2m mower being operated at 4 kmph. How much time it will
take to harvest the same if the field efficiency of mower is taken as 80 per
cent? Explain the terms registration and alignment as applied to the cutter bar
of a mower, and state how these adjustments are done.
(c) Describe the construction and
operation of a shunt motor starter. Draw a diagram of all its internal
connections’.
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