Agricultural Engineering Gate 2015 Questions with Answer

Ques 14 GATE 2015

The grain to straw ratio of wheat crop is 1.5: 1. The output capacity and cleaning efficiency of a thresher at an optimal operating condition are 500 kg h⁻¹ and 99%, respectively. If the grain recovery at main grain outlet is 100%, the throughput capacity in kg h⁻¹ will be

Ques 15 GATE 2015

A two-wheel drive tractor is operating a mould board plough at an average speed of 4 km h⁻¹. The draft and the rear axle torque are found to be 30 kN and 25 kN m, respectively. If the rolling radius of traction wheel is 0.7 m and the wheel slip is 20%, the tractive efficiency in percent will be

Ques 16 GATE 2015

A multiple disc clutch is to transmit 15 kW at 750 rpm. The inner and outer radii of the friction surfaces are 60 mm and 100 mm, respectively. The coefficient of friction is 0.1 and the maximum allowable pressure is 350 kPa. Assuming uniform wear, the number of pair of contact surfaces required is _______.

Ques 17 GATE 2015

The speed reductions in the 1st low gear of a tractor gearbox and differential with final drive are 5:1 and 40:1, respectively. For the tractor developing 24 kW power at an engine rpm of 2000 with an overall power transmission efficiency of 80%, the total torque in kN m available at the wheel axle will be

Ques 18 GATE 2015

A double acting hydraulic cylinder has a bore of 200 mm with a piston rod of 140 mm diameter. The extend speed of the piston is 80 mm s⁻¹. If the flow rate of oil during retraction is same as that of the extending, the retract speed of the piston in mm s⁻¹ is _______.

Ques 19 GATE 2015

The brake power of a six-cylinder, four-stroke diesel engine running at 3000 rpm is 125 kW. Its brake specific fuel consumption is 200 g kW⁻¹ h⁻¹. Assuming specific gravity of fuel as 0.85, the volume of fuel to be injected per cycle per cylinder in ml is

Ques 20 GATE 2015

The connecting rod of an internal combustion engine is subjected to

Ques 21 GATE 2015

Match the following items between Column-I and Column-II with the most appropriate combinations.

Ques 22 GATE 2015

A ball mill of 1.8 m diameter is loaded with steel balls each having a diameter of 6 cm. The rotational speed of the ball is kept at 75% of the critical speed. The operational speed of the ball mill in rpm is _______.

Ques 23 GATE 2015

A fat globule of 1.5 µm diameter is rising up in a stagnant skim milk medium of 1005 kg m⁻³ density and 1.5 cP viscosity. If the density of the fat globule is 915 kg m⁻³, the steady rising velocity of the globule in µm s⁻¹ is _______.

Ques 24 GATE 2015

Two kg mass of air at 40 °C with 0.023 kg water vapour per kg dry air is mixed with 3 kg mass of air at 20 °C with 0.008 kg water vapour per kg dry air to produce 5 kg mass of air at 60% relative humidity at 28 °C. Assume all the streams are at normal atmospheric pressure (101.325 kPa). The saturation vapour pressure of water in kPa at 28 °C is _______.

Ques 25 GATE 2015

In a cascade refrigeration system, the COPs of the cooling cycle and cascade are 3.7 and 4.2, respectively. If tonnage (1 TR = 3.52 kW) of the cooling cycle is 15 and the cascade removes 70% of the total heat rejected in the liquid receiver of the cooling cycle, then the powers required by the cooling and cascade compressors in hp are _______ and _______, respectively.

Ques 26 GATE 2015

A single effect long-tube evaporator has ten tubes each of 2.5 cm diameter and 6 m length. It concentrates pineapple juice from 18 °Brix to 23 °Brix. The feed rate into the evaporator is 557 kg h⁻¹ at the boiling point of 70 °C (latent heat of vaporization = 2333.82 kJ kg⁻¹). Neglecting boiling point rise, the overall heat transfer coefficient in W m⁻² K⁻¹ for 12 °C temperature gradient across the tube walls is _______.