Question 61. A 16 m high wind break is constructed to protect soil from wind erosion due to wind velocity of 18 m s-1 at 15 m height. The minimum wind velocity at 15 m height capable of moving the soil fraction is 8 m s-1. The angle of deviation of prevailing wind direction from the perpendicular to the wind break is 300. The distance of full protection from the wind break in m is

Question 62. Milk enters into the heating section of a high temperature short time (HTST) pasteurization plant at a temperature of 45ºC and leaves at 72ºC. Hot water at temperature of 95 ºC enters countercurrently into the heat exchanger and leaves at 77ºC. The effectiveness of the heat exchanger is

Question 63. A cold storage chamber is constructed with 10 mm mortar, 200 mm brick, 100 mm insulation and 5 mm wood-board having thermal conductivities of 0.8, 1.5, 0.025 and 0.2 W m-1 K-1, respectively. The resistance of 4 K m-1 W-1 is offered by

Question 64. For an initial spore load equal to 25 spores per container inoculated with Clostridium botulinum having D121 = 0.25 min, the spoilage probability of the container subjected to F121 = 1.5 min is

Question 65. Slope and intercept of the BET equation relating [aw/x(1 - aw)] and aw, where aw is water activity and x is the moisture content on dry basis, are 18 and 2, respectively. The values of thermodynamic constant C and BET monolayer moisture content xm(%) are respectively

Question 66. The equation representing the heat of respiration (q) of fruits and vegetables as a function of temperature (θ) with positive constants a and b is

Question 67. The horse power of the motor running the compressor of a refrigerator having COP of 4.5 and extracting 200 kJ kg-1 of evaporating heat with 1.5 kg min-1 refrigerant flow rate is

Question 68. A two-wheel drive tractor pulls an implement that has a draft force of 11.5 kN. The total motion resistance of the tractor is 2.5 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 _______________

Question 69. Two parallel canals 50 m apart fully penetrate a homogeneous unconfined aquifer resting on a horizontal impermeable layer. The aquifer has a hydraulic conductivity of 3 m day-1 and an effective porosity of 0.25. One-dimensional steady groundwater flow occurs from the upper canal to the lower canal with the height of water levels in the canals 10 m and 8.5 m from the aquifer bottom, respectively. If a sediment layer of 4 cm thick with hydraulic conductivity of 1.2 * 10-2 m day-1is ultimately deposited on the inflow face, the groundwater discharge per 1000 m width between the two canals in m3 day-1 will be _______________

Question 70. A tractor operated single acting trailing type disc harrow has 8 discs on each gang. The gang angle of both the gangs is maintained at 350. The horizontal component of resultant soil reaction force on each disc is 600 N and it makes an angle of 300 with the gang axis. If the speed of operation is 6 km h-1, the required drawbar power in kW to operate the harrow will be _______________