Tractors and Power tillers - Farm Power - Agricultural Engineering Previous Year Questions

1

2007 · Agricultural Engineering · Farm Power · Tractors and Power tillers

Agricultural Engineering (AG) 2007

A lubricating oil with high viscosity index is desirable for tractor engine due to

A

More variation of viscosity with temperature

B

Less variation of viscosity with temperature

C

High pour point

D

High cloud point

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2

2007 · Agricultural Engineering · Farm Power · Tractors and Power tillers

Agricultural Engineering (AG) 2007

In a tractor cab, the temperature comfort zone for the tractor operator is between

A

287 and 290 K

B

288 and 293 K

C

291 and 297 K

D

295 and 301 K

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3

2007 · Agricultural Engineering · Farm Power · Tractors and Power tillers

Agricultural Engineering (AG) 2007

As per ASABE standards, the three-point hitch of a two-wheel drive tractor with a maximum drawbar power of 45 kW comes under the category

A

I

B

II

C

III

D

IV

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4

2007 · Agricultural Engineering · Farm Power · Tractors and Power tillers

Agricultural Engineering (AG) 2007

A tractor engine developing 30 kW rejects heat at the rate of 0.58 kW per kW of engine output. A water cooling system is to be installed in the tractor. The expected temperature rise as air moves through the radiator is 20 K. The frontal area of the radiator is limited to 0.16 m\(^2\). If density of air is 1.29 kg m\(^{-3}\) and specific heat of air is 1.0 kJ kg\(^{-1}\) K\(^{-1}\), the amount of air to be blown per unit time through the radiator frontal area is

A

0.674 m\(^3\)s\(^{-1}\)

B

0.870 m\(^3\)s\(^{-1}\)

C

1.162 m\(^3\)s\(^{-1}\)

D

1.502 m\(^3\)s\(^{-1}\)

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5

2008 · Agricultural Engineering · Farm Power · Tractors and Power tillers

Agricultural Engineering (AG) 2008

The nature of variation of tractive efficiency (TE) with wheel slip (S) in a rear wheel driven tractor is

A

B

C

D

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6

2009 · Agricultural Engineering · Farm Power · Tractors and Power tillers

Agricultural Engineering (AG) 2009

As per BIS standard, the power tests for tractor PTO includes

A

Maximum power, varying load and varying speed tests

B

Varying speed and maximum power tests

C

Varying load and varying speed tests

D

Varying load and maximum power tests

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7

2010 · Agricultural Engineering · Farm Power · Tractors and Power tillers

Agricultural Engineering (AG) 2010

A two-wheel drive tractor has a PTO speed of 540 rpm and it produces 35 kW net engine power. Corresponding torque available at PTO in N m will be

A

435 – 457

B

465 – 485

C

495 – 505

D

535 – 558

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8

2011 · Agricultural Engineering · Farm Power · Tractors and Power tillers

Agricultural Engineering (AG) 2011

Which one of the following is NOT a towed wheel?

A

wheels of power tiller

B

front wheels of two wheel drive tractor

C

wheels of bullock cart

D

wheels of trailer

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9

2011 · Agricultural Engineering · Farm Power · Tractors and Power tillers

Agricultural Engineering (AG) 2011

The cost of a tractor is Rs. 340000. Its service life is 10 years and the salvage value is 10% of initial cost. Its depreciation in 2nd year, following constant rate method, in rupees would be

A

30600

B

34000

C

50070

D

55550

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10

2013 · Agricultural Engineering · Farm Power · Tractors and Power tillers

Agricultural Engineering (AG) 2013

During a test, sound level was measured as 90 dB in the operator's cabin on a tractor. Taking reference sound pressure as \(2 \times 10^{-5} \text{ N m}^{-2}\), the measured RMS sound pressure in \(\text{N m}^{-2}\) is

A

6.32

B

\(6.32 \times 10^{-1}\)

C

\(1.8 \times 10^{-3}\)

D

\(6.32 \times 10^{-10}\)

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11

2013 · Agricultural Engineering · Farm Power · Tractors and Power tillers

Agricultural Engineering (AG) 2013

A two-wheel drive tractor pulls an implement that has a draft force of \(11.5 \text{ kN}\). The total motion resistance of the tractor is \(2.5 \text{ kN}\). Under these circumstances, the slip of the drive wheels is 20%. If the power loss in transmission is 20%, the percentage of power lost in converting engine power into drawbar power is ________

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12

2013 · Agricultural Engineering · Farm Power · Tractors and Power tillers

Agricultural Engineering (AG) 2013

the dynamic ground reaction against the tractor rear wheels in kN is

A

14.0

B

24.0

C

24.5

D

26.4

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13

2014 · Agricultural Engineering · Farm Power · Tractors and Power tillers

Agricultural Engineering (AG) 2014

A four-stroke, four-cylinder diesel engine running at 2000 rpm develops brake power of 60 kW and the fuel consumption is 0.30 kg kW^–1 h^–1. The engine has a bore of 120 mm and stroke of 100 mm. Air-fuel ratio is 15:1 and air density is 1.15 kg m^–3. The volumetric efficiency of the engine in percent is

A

43.25

B

66.32

C

75.22

D

86.50

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14

2017 · Agricultural Engineering · Farm Power · Tractors and Power tillers

Agricultural Engineering (AG) 2017

In a tractor power transmission, the input pinion (24 teeth) is in mesh with a gear (46 teeth) on counter shaft and another gear (20 teeth) of counter shaft is in mesh with main shaft gear (50 teeth). The engine is running at 1800 rpm, differential gear ratio is 3.5:1 and final drive ratio is 4:1. If the tractor is fitted with 1.2 m diameter rear wheels, the forward speed of the tractor in km h⁻¹ is ______.

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15

2018 · Agricultural Engineering · Farm Power · Tractors and Power tillers

Agricultural Engineering (AG) 2018

A two-wheel drive tractor with rear wheel rolling radius of 600 mm develops a tractive force of 18.5 kN at a wheel slip of 12%. The engine speed is 2400 rpm and the transmission ratio from the engine to the rear wheels is 120:1. If the tractor experiences a motion resistance of 1.75 kN, the drawbar power developed by the tractor will be ______ kW.

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16

2020 · Agricultural Engineering · Farm Power · Tractors and Power tillers

Agricultural Engineering (AG) 2020

A two-wheel drive tractor with a total weight of 25 kN has a wheelbase of 2.2 m and its centre of gravity lies 0.7 m ahead of the centre of rear axle. A steady horizontal pull is applied at a drawbar hitch height of 0.5 m on a concrete surface such that the weight on front axle becomes 20% of static weight of the tractor. The coefficient of net traction (round off to 2 decimal places) is ________.

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17

2020 · Agricultural Engineering · Farm Power · Tractors and Power tillers

Agricultural Engineering (AG) 2020

The cooling system of a tractor fitted with diesel engine rejects 0.58 kW of heat per kW of brake power. It requires 0.16 L s⁻¹ of water per kW of heat rejection from the engine to maintain a temperature drop of 6 °C of water as it moves from the top of radiator to its bottom. If the engine develops 45 kW brake power, the required water flow rate in the radiator in L s⁻¹ (round off to 2 decimal places) is ________.

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18

2021 · Agricultural Engineering · Farm Power · Tractors and Power tillers

Agricultural Engineering (AG) 2021

A gear pump has a displacement of 120 cm³ rev^-1 and it runs at 1500 rpm against a system pressure of 18 MPa. If the torque efficiency of the pump is 90%, actual torque required to run the pump in N-m is ______. [round off to 2 decimal places] (Take \(\pi = 3.14\))

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19

2021 · Agricultural Engineering · Farm Power · Tractors and Power tillers

Agricultural Engineering (AG) 2021

During operation of a two-wheel drive tractor with a total weight of 20 kN in pure sandy soil (angle of internal friction is 26.5°), the weight distribution at the front and rear axles are found to be 35% and 65%, respectively. If extra weight of 2.5 kN is added to each of the rear wheels, the change in maximum thrust developed by the tractor in per cent will be ______. [round off to 2 decimal places]

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20

2022 · Agricultural Engineering · Farm Power · Tractors and Power tillers

Agricultural Engineering (AG) 2022

A two-wheel drive tractor is fitted with driving wheels having rolling radius of 860 mm. The effective gear ratio between the engine to the drive wheels is 98:1 and the power transmission efficiency at that gear ratio is 86%. If the engine torque is 520 N m, the ground thrust developed by the drive wheels in kN is ______. [round off to two decimal places]

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