Farm Machinery - Farm Machinery - Agricultural Engineering Previous Year Questions

1

2007 · Agricultural Engineering · Farm Machinery

Agricultural Engineering (AG) 2007

A two-wheel drive tractor weighing 20 kN has a wheel base of 2.1 m with a static weight distribution of 35% and 65% at the front and rear axles respectively. On a level ground, the tractor moves at a speed of 4 km h\(^{-1}\). Considering small steer angle, the cornering force acting on each of the front tyre for a turning radius of 1.8 m is

A

0.244 kN

B

0.454 kN

C

0.489 kN

D

0.907 kN

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2

2007 · Agricultural Engineering · Farm Machinery

Agricultural Engineering (AG) 2007

A tractor drawn rotary cultivator in concurrent revolution mode is to be operated at a depth of 150 mm and at a forward speed of 3.6 km h\(^{-1}\). The radius of working set is 280 mm. The number of blades, which would cut identical path is 3. The working width of the cultivator is 1.8 m. The cultivator is to be powered from the tractor PTO running at 540 rpm through a suitable gearbox. For getting a tilling pitch of 74.1 mm, the suitable gear ratio is

A

1:2

B

1:1.5

C

1.5:1

D

2:1

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3

2007 · Agricultural Engineering · Farm Machinery

Agricultural Engineering (AG) 2007

A farmer has a choice of buying a 4 bottom × 41 cm mould board plough for Rs 8570 or a 5 bottom × 45 cm mould board plough for Rs 12000. Each plough has a life of 15 years. Neglect salvage value, interest charges and other costs on the ploughs. With either plough the operating speed is 6.5 km h\(^{-1}\) and field efficiency is 82%. Assume that the cost per hectare for tractor energy to be same for both the ploughs. If the labor cost is Rs 10 per hour, the minimum number of hectares that would justify the purchase of the larger plough (i. e. break even point) is

A

73.7

B

89.9

C

737.3

D

899.4

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4

2007 · Agricultural Engineering · Farm Machinery

Agricultural Engineering (AG) 2007

A right hand offset disk harrow is operating with front and rear gang angles of 15° and 21° respectively. The centers of the two gangs are 2.45 m and 4.25 m behind a transverse line through the hitch point on the tractor drawbar. The horizontal soil force components are : \(L_f\) = 3.1 kN, \(S_f\) = 2.65 kN, \(L_r\) = 3.35 kN, and \(S_r\) = 2.65 kN. The amount of offset of the center of cut with respect to the hitch point is

A

0.740 m

B

0.795 m

C

0.968 m

D

1.006 m

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5

2007 · Agricultural Engineering · Farm Machinery

Agricultural Engineering (AG) 2007

A gravity feed type liquid fertilizer distributor has fixed orifices for metering. Liquid is supplied from a top vented tank with a height of 460 mm. The bottom of the tank is 610 mm above the ground and the ends of the delivery tube are 75 mm below the ground level. The metering heads (including orifices) are just below the tank, but the delivery tubes are small enough so that each one remains full of liquid between the orifice and the outlet end (thereby producing a negative pressure head on the orifice). The ratio between flow rates when the tank is full and when it is filled to a height of only 25 mm is

A

1.27

B

1.61

C

2.31

D

4.28

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6

2007 · Agricultural Engineering · Farm Machinery

Agricultural Engineering (AG) 2007

A 6 bladed forage blower operates at 540 rpm. For a feed rate of \(6.5\times10^4\) kg h\(^{-1}\), the mass of corn silage carried on each impeller blade is

A

0.334 kg

B

2.006 kg

C

12.037 kg

D

20.060 kg

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7

2007 · Agricultural Engineering · Farm Machinery

Agricultural Engineering (AG) 2007

The wheel numeric for each of the rear wheels is

A

39.50

B

58.17

C

79.01

D

116.37

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8

2007 · Agricultural Engineering · Farm Machinery

Agricultural Engineering (AG) 2007

Rolling resistance of each of the front wheels is

A

0.244 kN

B

0.354 kN

C

0.575 kN

D

0.707 kN

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9

2007 · Agricultural Engineering · Farm Machinery

Agricultural Engineering (AG) 2007

If the same tractor is to be towed on a level ground with compacted dry clay soil, the force required for towing is

A

0.27 kN

B

0.40 kN

C

0.53 kN

D

0.80 kN

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10

2008 · Agricultural Engineering · Farm Machinery

Agricultural Engineering (AG) 2008

The essential requirement for turning in a power tiller is accomplished by having

A

both the wheels as towed wheels

B

only one wheel driven by the engine, while the other wheel is always free to rotate

C

one of the wheels disconnected from the engine at the time of turning

D

the same mechanism as used in a rear wheel driven tractor

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11

2008 · Agricultural Engineering · Farm Machinery

Agricultural Engineering (AG) 2008

The function of a differential lock used in a rear wheel driven tractor is

A

to operate both the rear wheels at the same speed

B

to operate both the rear wheels at differential speeds

C

to operate both the rear wheels at the same torque

D

to evenly distribute the power to both the wheels

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12

2008 · Agricultural Engineering · Farm Machinery

Agricultural Engineering (AG) 2008

A flail mower is operated using the PTO power of a tractor through a bevel gear drive. The tractor forward speed is 10.8 km h^-1. The velocity of the flail tip with respect to the ground is 18 m s^-1. The length of each flail is 400 mm and the diameter of the shaft carrying the flails is 100 mm. If the tractor PTO speed is 800 rpm, the required bevel gear reduction is

A

1.13

B

2.00

C

2.25

D

2.51

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13

2008 · Agricultural Engineering · Farm Machinery

Agricultural Engineering (AG) 2008

A tractor drawn seed broadcast is operated at 10.8 km h^-1. The broadcaster has a horizontal seed plate located inside the hopper above the ground level. The diameter of the plate is 300 mm and its angular velocity is 80 rad s^-1. If the air resistance is neglected, the resultant velocity with which the seed mass is approaching the furrow 3 seconds after its release from the hopper is

A

29.40 m s^-1

B

30.52 m s^-1

C

31.75 m s^-1

D

41.40 m s^-1

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14

2008 · Agricultural Engineering · Farm Machinery

Agricultural Engineering (AG) 2008

If the forward speed of the tractor is 7.5 km h^-1, the field capacity of the sprayer in ha h^-1 is

A

2.84

B

7.00

C

7.13

D

7.50

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15

2008 · Agricultural Engineering · Farm Machinery

Agricultural Engineering (AG) 2008

The coefficient of traction developed by the tractor for this operation is

A

0.15

B

0.49

C

0.50

D

0.56

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16

2008 · Agricultural Engineering · Farm Machinery

Agricultural Engineering (AG) 2008

If the wheel slip is 20 percent and the coefficient of rolling resistance is 0.04, the tractive efficiency of the tractor is

A

92.39 %

B

87.17 %

C

73.96 %

D

21.79 %

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17

2009 · Agricultural Engineering · Farm Machinery

Agricultural Engineering (AG) 2009

The initial cost of a tractor is Rs. 4,00,000. The annual rate of depreciation is 15%. Following declining balance method, the value of the tractor at the end of 6th year is

A

Rs. 40,000

B

Rs. 1,51,000

C

Rs. 1,76,000

D

Rs. 2,01,000

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18

2009 · Agricultural Engineering · Farm Machinery

Agricultural Engineering (AG) 2009

The diameter of an undeflected tractor wheel fitted with 13.6 – 28, 12 PR tyre with an aspect ratio of 0.75 is

A

0.99 m

B

1.05 m

C

1.23 m

D

1.40 m

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19

2009 · Agricultural Engineering · Farm Machinery

Agricultural Engineering (AG) 2009

A two-wheel drive tractor is pulling a load of 12 kN horizontally on a leveled surface at a forward speed of 5.0 km h^-1. The rolling radius of the traction wheel and wheel slip are 0.65 m and 20% respectively. If the rear axle torque is 9 kN m, the tractive efficiency is

A

56.7%

B

62.1%

C

69.3%

D

78.5%

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20

2009 · Agricultural Engineering · Farm Machinery

Agricultural Engineering (AG) 2009

The disc and tilt angles of a single bottom disc plough having 0.76 m disc diameter are 50° and 25°, respectively. If the depth of ploughing is 0.25 m, width of cut of the plough in m is

A

0.508

B

0.526

C

0.546

D

0.559

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