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Machine Design(10)Farm Machinery and Equipment(17)

Machine Design

10 Questions

GATE→2026→Farm Machinery→Machine Design

Q1

MCQ[1 Mark]

A plough attachment, which is a miniature plough bottom that cuts a narrow, shallow furrow ahead of the shin and moves trash and roots toward the main furrow so that they are completely covered by the mouldboard, is called as (A) Jointer (B) Coulter (C) Subsoiler (D) Weed hook

(A)

Jointer

(B)

Coulter

(C)

Subsoiler

(D)

Weed hook

Explanation

GATE→2026→Farm Machinery→Machine Design

Q2

MCQ[2 Marks]

A flat belt of negligible mass and thickness drives an output pulley of 0.6 m diameter, constantly rotating at 500 rpm without slip. The arc of contact is 190°for this pulley, while it is 170° for the smaller input pulley. The coefficient of friction between the belt and pulleys is 0.30. The measured slack-side tension is 250 N. Neglecting other losses, the power transmitted by the belt drive, in kW, is nearest to (Take π = 3.14) (A) 4.8 (B) 5.6 (C) 6.5 (D) 7.3

(A)

4.8

(B)

5.6

(C)

6.5

(D)

7.3

Explanation

GATE→2026→Farm Machinery→Machine Design

Q3

MCQ[2 Marks]

A tractor PTO runs at a constant speed of 540 rpm to drive a rotary tiller via flange coupling having a shear pin parallel to the shaft. The shear pin axis is located at 60 mm from the PTO shaft axis. The allowable shear stress of the pin material is 200 MPa. For overload safety, it must fail at 150% of the rated torque to protect the gearbox. The tiller requires 40 kW under normal load at rated PTO speed. Neglecting bending, stress concentration effects, and other losses, the pin diameter, in mm, is nearest to (Take π = 3.14) (A) 7.5 (B) 10.6 (C) 6.1 (D) 8.6

(A)

7.5

(B)

10.6

(C)

6.1

(D)

8.6

Explanation

GATE→2026→Farm Machinery→Machine Design

Q4

NAT[2 Marks]

A tractor PTO shaft, through a spur-gear reduction, drives a small grain auger at 540 rpm. The driving gear on the PTO shaft has 0.18 m pitch circle diameter. The auger requires 3.5 kW, transmitted through this gear. Normal force along the line of action between the meshing teeth is 760 N. Assume involute spur gears, single tooth contact, and neglect friction. The pressure angle (in degrees) is ________. (Rounded off to two decimal places) (Take π = 3.14)

Explanation

GATE→2025→Farm Machinery→Machine Design

Q5

NAT[2 Marks]

A solid round uniform diameter shaft is transmitting 25 kW power at 540 rpm. The maximum allowable shear stress of the shaft material is 35 MPa. If the maximum torque exceeds the mean torque by 20%, neglecting the bending effect, the minimum shaft diameter is ___ mm. (Rounded off to 2 decimal places)

Explanation

GATE→2024→Farm Machinery→Machine Design

Q6

NAT[1 Mark]

A chain drive is used to transmit power from a DC motor to the shaft of a solar energy operated thresher by reducing the speed from 240 rpm to 120 rpm. The number of teeth on the driving sprocket is 20 and the pitch circle diameter of the driven sprocket is 600 mm. The pitch of the chain used, in mm, is ___ (Rounded off to 2 decimal places)

Explanation

GATE→2023→Farm Machinery→Machine Design

Q7

NAT[2 Marks]

A power operated chaff cutter with a mean cutting radius of 0.25 m is fitted with two cutting knives and is rotating at 300 rpm. Thirty maize stalks with a mean diameter of 12 mm are fed through the throat at a time. The dynamic shear strength of the stalk is 0.05 N $\text{mm}^{-2}$ The mass and radius of gyration of the flywheel (including knives) are 40 kg and 0.27 m, respectively. The total shaft power requirement in kW is ___ (rounded off to 2 decimal places).

Explanation

GATE→2023→Farm Machinery→Machine Design

Q8

NAT[2 Marks]

A single disc clutch is used to transmit 10 kW power at 1400 rpm. The axial pressure exerted on the contact surface is 0.07 N $\text{mm}^{-2}$ and the coefficient of friction is 0.25. Considering the ratio of diameter to face width of the clutch lining as 8 and assuming uniform wear theory, the required face width of friction lining in mm is ___ (rounded off to 2 decimal places).

Explanation

GATE→2022→Farm Machinery→Machine Design

Q9

NAT[1 Mark]

An open V-belt is wrapped around V-pulleys having effective diameters of 0.25 m and 0.65 m, and their centres are 1 m apart. Assuming ideal conditions, the wrap angle in degree for the smaller pulley is [round off to two decimal places] (Take $\pi=3.14$)

Explanation

GATE→2022→Farm Machinery→Machine Design

Q10

NAT[2 Marks]

A mild steel flange-mounted single shear pin (Ultimate shear strength $=42$ MPa) of 10 mm diameter is used in a flange. The perpendicular distance between the axis of driving shaft and the shear pin axis is 100 mm. If the speed of the driving shaft is 300 rpm, the maximum power the shaft could transmit in kW before the failure of the pin is [round off to two decimal places] [Take $\pi=3.14$]

Explanation

Farm Machinery and Equipment

17 Questions

GATE→2026→Farm Machinery→Farm Machinery and Equipment

Q11

NAT[2 Marks]

A tractor-mounted boom sprayer carries a horizontal row of 12 identical flat-fan nozzles (spray angle 110°). To achieve uniform coverage, the required lateral overlap between adjacent nozzle footprints at the target plane is 30% of single nozzle footprint. Boom height is 0.60 m above the target plane. The tractor is set to travel at a theoretical forward speed of 8 km.h−1. Wheel slip is 8% and the field efficiency is 75%. All other losses are neglected. The total time (in minutes) required to spray 25 ha field is ________. (Rounded off to the nearest integer)

Explanation

GATE→2026→Farm Machinery→Farm Machinery and Equipment

Q12

NAT[2 Marks]

A 8 × 20 cm seed drill has 0.60 m diameter ground wheel. On a hard-surface calibration stand, the drill delivers 814 g of seeds in 30 wheel revolutions. When operated in a field having soft soil, the wheel’s effective rolling circumference reduces by 4%. Neglecting other losses, the actual-field seed application rate (in kg.ha−1) is ________. (Rounded off to two decimal places) (Take π = 3.14)

Explanation

GATE→2025→Farm Machinery→Farm Machinery and Equipment

Q13

MCQ[1 Mark]

While sowing mustard seeds (bulk density $=800\text{ kg}\cdot\text{m}^{-3}$) a four-row fluted roller type seed drill with 25 cm row spacing operates at a speed of $2.5\text{ km}\cdot\text{h}^{-1}$. For a desired seed rate of $5.0\text{ kg}\cdot\text{ha}^{-1}$, the flowrate of seeds from the machine in $\text{m}^{3}\cdot\text{h}^{-1}$ is:

(A)

$0.391\times10^{-3}$

(B)

$1.563\times10^{-3}$

(C)

$1.172\times10^{-3}$

(D)

$1.953\times10^{-3}$

Explanation

GATE→2025→Farm Machinery→Farm Machinery and Equipment

Q14

NAT[2 Marks]

A mouldboard plough is operated by a 2WD tractor with 6.0 kN pull. The ratio of the lateral component to the longitudinal component of soil forces is 0.30, and the ratio of the vertical component to the longitudinal component of soil forces is 0.50. If diameter of the driving wheels is 1.2 m and the rear axle rotates at 10 rpm, the drawbar power produced at 20% wheel slip is ___ kW. (Rounded off to 2 decimal places)

Explanation

GATE→2025→Farm Machinery→Farm Machinery and Equipment

Q15

NAT[2 Marks]

For a right-hand offset disc harrow, the longitudinal distance from the hitch point to the centers of the front and rear gangs are 2.5 m and 4.5 m, respectively. The resultant horizontal soil forces in longitudinal direction on the front and rear gangs are 3.0 kN and 3.5 kN, respectively; while the resultant horizontal soil forces in lateral directions are 2.5 kN and 4.0 kN, respectively. Considering the resultant soil forces acting at the centers of front and rear gangs, the amount of offset of the center of cut with respect to the hitch point is ___ m. (Rounded off to 2 decimal places)

Explanation

GATE→2024→Farm Machinery→Farm Machinery and Equipment

Q16

NAT[1 Mark]

A tractor drawn rotavator with a rotor radius 300 mm has 6 flanges having 3 blades in each flange acting in one plane. It is operated at a rotor speed of 180 rpm and a forward speed of $3\text{ km}\cdot\text{h}^{-1}$. Increasing the forward speed as well as the rotor speed by 15% each, the change in length of soil slice, in mm, is ___ (Answer in integer)

Explanation

GATE→2024→Farm Machinery→Farm Machinery and Equipment

Q17

MCQ[2 Marks]

A 4.2 m self-propelled combine harvester operating at a forward speed of $3.5\text{ km}\cdot\text{h}^{-1}$ is used to harvest wheat in an area of 300 ha in a year at a field efficiency of 75%. Consider the variable cost to be linearly related to the actual hours of operation. To bring down the cost of operation per hour by 15%, the change in area required to be harvested per year, in ha, is (Rounded off to 2 decimal places)

(A)

A

(B)

B

(C)

C

(D)

D

Explanation

GATE→2024→Farm Machinery→Farm Machinery and Equipment

Q18

NAT[2 Marks]

A single acting disk harrow having 5 disks in each gang with a gang angle of $20^{\circ}$ is operated at a forward speed of $3\text{ km}\cdot\text{h}^{-1}$ and a depth of 10 cm. The horizontal soil reaction force acting parallel to the face of each disk is found to be 250 N. The drawbar power required to pull the harrow, in kW, is ___ (Rounded off to 2 decimal places)

Explanation

GATE→2024→Farm Machinery→Farm Machinery and Equipment

Q19

NAT[2 Marks]

A tractor drawn boom type sprayer fitted with 12 nozzles at a spacing of 50 cm is used to carryout spraying at a forward speed of $3.5\text{ km}\cdot\text{h}^{-1}$ and nozzle pressure of 250 kPa for an application rate of $1.5\text{ m}^3\cdot\text{ha}^{-1}$. Out of the total discharge from the pump, 12% is bypassed to the liquid tank and the total pressure drop in all pipe lines from the pump is 10% of the pressure developed by the pump. Considering the pump efficiency as 60%, if the nozzle pressure is increased by 10%, the power required to operate the pump, in kW, is ___ (Rounded off to 3 decimal places)

Explanation

GATE→2023→Farm Machinery→Farm Machinery and Equipment

Q20

MCQ[1 Mark]

In rotary tiller, the total energy requirement for carrying out tillage will decrease if

(A)

the bite length is increased

(B)

the bite length is decreased

(C)

the cone index of soil is higher

(D)

forward speed of the machine is reduced

Explanation

GATE→2023→Farm Machinery→Farm Machinery and Equipment

Q21

MCQ[1 Mark]

In a thresher, the cylinder separation efficiency can be improved by increasing

(A)

cylinder diameter

(B)

cylinder speed

(C)

cylinder-concave clearance

(D)

feed rate

Explanation

GATE→2023→Farm Machinery→Farm Machinery and Equipment

Q22

MCQ[2 Marks]

A vertical disc plough with 5 discs is operated at a depth of 0.15 m. The disc angle and disc diameter are $40^{\circ}$ and 0.6 m, respectively. If overlap between two consecutive discs is 0.12 m at 0.15 m depth of cut, the total width of cut at the specified depth in m is

(A)

1.19

(B)

1.55

(C)

2.11

(D)

2.36

Explanation

GATE→2023→Farm Machinery→Farm Machinery and Equipment

Q23

MCQ[2 Marks]

In a $9\times20$ cm fluted roller type seed drill, each fluted roller is discharging 4.25 g of seed per revolution of fluted roller shaft. The fluted roller shaft rotates once for two complete rotation of the ground drive wheel of the seed drill. The rolling diameter of the ground drive wheel is 0.35 m. Considering no skid of the ground drive wheel, the seed rate in $\text{kg }\text{ha}^{-1}$ is Consider $\pi=3.14$

(A)

96.62

(B)

141.55

(C)

187.35

(D)

386.42

Explanation

GATE→2022→Farm Machinery→Farm Machinery and Equipment

Q24

MCQ[1 Mark]

Annual cost of owning (fixed cost) a particular combine harvester is Rs. 3,00,000 whereas, operating it would cost additional Rs. 6,000 per hectare. If an entrepreneur wishes to offer the machine for custom hiring, the combination of annual use (ha) and custom rate (Rs. $\text{ha}^{-1}$), respectively, that would fetch him the break-even condition is

(A)

200 and 7,500

(B)

210 and 6,300

(C)

180 and 9,200

(D)

250 and 6,100

Explanation

GATE→2022→Farm Machinery→Farm Machinery and Equipment

Q25

MCQ[2 Marks]

A $5\times20$ cm seed drill has a ground drive wheel of rolling diameter 0.5 m. While testing under laboratory condition, 320 g of seeds were collected in 20 revolutions of the ground drive wheel. The same seed drill when operated in a 2 ha field, amount of seeds dropped was found to be 185 kg. The variation in the seed dropped between laboratory and field conditions due to skid of ground drive wheel is (Take $\pi=3.14$)

(A)

6.38%

(B)

9.23%

(C)

10.17%

(D)

12.26%

Explanation

GATE→2022→Farm Machinery→Farm Machinery and Equipment

Q26

MCQ[2 Marks]

A 3.6 m combine harvester was tested over a crop strip of 20 m length and the following data were obtained while testing: Total material left over walker = 8.5 kg, Free seed over walker = 100 g, Unthreshed seed over walker = 50 g, Total material left over shoe = 5.5 kg, Free seed over shoe = 250 g, Unthreshed seed over shoe = 80 g, Total seed collected in the grain tank = 16.5 kg. The grain yield (tonne ha¹) and cylinder loss (%), respectively, are

(A)

2.36 and 0.77

(B)

4.24 and 0.29

(C)

6.28 and 0.47

(D)

8.05 and 2.82

Explanation

GATE→2022→Farm Machinery→Farm Machinery and Equipment

Q27

NAT[2 Marks]

A tractor operated $12\times60$ cm boom sprayer had an overlap of 30 cm between the successive passes during field operation at an average speed of 4.2 $\text{km h}^{-1}$. A total time loss of 7.5 $\text{min ha}^{-1}$ was observed during turnings. Assuming no overlap of spray material between adjacent nozzles, the field efficiency of the sprayer in per cent is [round off to two decimal places]

Explanation