This set of Farm Machinery Multiple Choice Questions & Answers focuses on “Tillage – Mouldboard Plough”.
1. What percentages of carbon are present in share of a mouldboard?
a) 0.70%-0.80%
b) 0.50%-0.60%
c) 0.30%-0.40%
d) 0.10%-0.20%
View Answer
Explanation: The share is made of chilled cast iron or steel. The steel mainly consists about 0.70%-0.80% of carbon besides other minor elements.
2. A bullock drawn desi plough is working at 2.4 KMPH and cutting soil 20 cm deep and 20 cm wide furrow at top. Calculate the volume of soil cut in 5h.
a) 248 m3
b) 219 m3
c) 240 m3
d) 200 m3
View Answer
Explanation: Cross sectional area = \(\frac{1}{2}\)*W*h = \(\frac{1}{2}\)*20*20 = 200 cm3 = 0.02 m3
Distance covered in 5 h = 2.4 * 5 = 12 km = 12000 m
Therefore, volume of soil cut in 5 h = 12000 * 0.02 = 240 m3
3. A pair of bullocks exert 100 kg pull at 30° to the horizontal while making a V-shape furrow 15 cm wide and 5 cm deep. The speed of ploughing is 3 KMPH. What is the unit draft on the implement and horsepower developed by the bullocks?
a) 2.31 kg/cm2; 0.96 HP
b) 2.11 kg/cm2; 0.86 HP
c) 2.56 kg/cm2; 0.98 HP
d) 3.11 kg/cm2; 0.76 HP
View Answer
Explanation:
Cross sectional area = \(\frac{1}{2}\)*b*h = \(\frac{1}{2}*15*5\) = 37.5cm2
Unit draft (Du) = \(\frac{P cosθ}{A} = \frac{100*cos30°}{37.5}\) = 2.31kg/cm2
Power = \(\frac{[Draft (kg)*S (\frac{m}{s})]}{75}\) hp = \(\frac{[P cos30°*3*1000]}{75*60*60}\)=0.96 HP.
4. A two-wheel drive tractor pulls an implement which requires a draft of 12.5 KN. The motion resistance of the tractor is 4.5 KN and the slip of the driver wheel is 20%. The transmission efficiency is 0.8. the percentage of power lost in converting engine power into drawbar power is ______
a) 26.47%
b) 36%
c) 41.18%
d) 52.94%
View Answer
Explanation:
According to figure
0.64x = 17; x=26.56
D=12.5 KN, R+4.5 KN, s=20%
P=12.5 + 4.5=17 KN; But useful pull is only 12.5 KN
Percent Loss = \(\frac{26.56-12.5}{26.56}\) *100 = 52.94%.
5. What percentage of manganese are present in the share of a mouldboard?
a) 0.50%-0.80%
b) 0.90%-1%
c) 0.20%-0.40%
d) 0.10%-0.30%
View Answer
Explanation: The share is made of chilled cast iron or steel. The steel mainly consists about 0.50%-0.80% of manganese besides other minor elements.
6. Which share has a detachable piece?
a) Slip share
b) Slipnose share
c) Shin share
d) Bar point share
View Answer
Explanation: Slipnose share is a share in which the point of share is provided by a small detachable piece. It has the advantage that share point can be replaced as and when required.
7. Which mouldboard has gentle curvature which lifts and inverts the unbroken furrow slice?
a) Slat type
b) General purpose type
c) Sod or breaker type
d) Stubble type
View Answer
Explanation: Sod or breaker type is a long mouldboard with gentle curvature which lifts and inverts the furrow slice. It turns over thickly covered soil. This is very useful where complete inversion of soil is required.
8. Gunnel is which face of the share that slides along the furrow wall?
a) Vertical
b) Horizontal
c) Centre
d) Parallel
View Answer
Explanation: Gunnel is the vertical face of the share which slides along the furrow wall. It takes the side thrust of the soil and supports the plough bottom against the furrow wall.
9. Which share has the disadvantage of replacing the entire share if it gets worn out?
a) Bar point share
b) Shin share
c) Slipnose share
d) Slip share
View Answer
Explanation: Slip share is one piece share with curved cutting edge and no additional parts. It is a common type of share used by the farmers. It is simple in design, but has a disadvantage that the entire share has to be replaced if it is worn out due to constant use.
10. Horizontal suction varies according to ______
a) Line of pull
b) Size of plough
c) Draft
d) Centre of power
View Answer
Explanation: It is the maximum clearance between the landside and a horizontal plane touching point of share at its gunnel side and heal of land side. This suction helps the plough to cut the proper width of furrow slice. This clearance varies according the to the size of the plough, which is the distance from wing of the share to the line joining the point of share and heel of landside.
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