Agricultural Engineering Gate 2013 Questions with Answer

Ques 27 GATE 2013

Slope and intercept of the BET equation relating x_w / (1 - a_w) x_w and a_w, where a_w 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 x_m (%) are respectively

Ques 28 GATE 2013

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^2 W^{-1} is offered by

Ques 29 GATE 2013

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

Ques 30 GATE 2013

The overall heat transfer coefficient based on the outside surface area of a tubular heat exchanger decreased due to fouling during operation from 1000 W m^{-2} K^{-1} to 800 W m^{-2} K^{-1}. The fouling film coefficient of the heat exchanger in W m^{-2} K^{-1} is _______________

Ques 31 GATE 2013

A high pressure dairy homogenizer operates under upstream and downstream pressures of 200 and 40 bar respectively homogenizing 30 L of whole milk per hour. Density and specific heat capacity of whole milk are 1030 kg m^{-3} and 3.8 kJ kg^{-1} K^{-1}, respectively. Assuming complete energy conservation, the temperature rise of whole milk in degree Celsius is _______________

Ques 32 GATE 2013

A fish fillet of 5 mm thickness having 85% moisture (wet basis) is to be frozen using a plate freezer. The plates are at -35 °C and the heat transfer coefficient between the fillet and the freezer plates can be assumed to be 2.0 W m^{-2} K^{-1}. The initial freezing temperature of fish is -2.5 °C, latent heat of fusion is 330 kJ kg^{-1}, density of fish is 1100 kg m^{-3} and thermal conductivity of frozen fish is 1.5 W m^{-1} K^{-1}. The time required to freeze the fillet from the initial freezing temperature in hour(s) is __________

Ques 33 GATE 2013

A rotary dryer is used to dry 1200 kg h^{-1} of paddy containing 30% moisture (wet basis) to give a product containing 15% moisture (wet basis). Alternately, a portion of the dry product may be recycled and mixed with the fresh feed such that the mixed feed enters the dryer with moisture content of 20% (wet basis). The moisture evaporation rate without recycle and the paddy recycle rate in kg h^{-1} respectively in the dryer are

Ques 34 GATE 2013

The work index of a material is 6.25. If 80% of the feed and 80% of the product pass through IS Sieve No. 340 (3.25 mm opening) and IS Sieve No. 40 (0.42 mm opening), respectively, the power consumed in kW to crush 5000 kg h^{-1} of sorghum is

Ques 35 GATE 2013

In a screen separator, the mass flow rates of feed, overflow and underflow are 150, 140 and 10 kg h^{-1}, respectively. Mass fraction of material in the feed and overflow are 0.9 and 0.96, respectively. The effectiveness of separation in percentage is

Ques 36 GATE 2013

A milk fat globule of 2 µm diameter is rising in whole milk of density 1030 kg m^{-3} and coefficient of viscosity 10^{-3} Poise. If the fat density is 950 kg m^{-3}, the time needed to rise 10 mm for this fat globule in min is

Ques 37 GATE 2013

Specific heat capacity of dry air and water vapour are 1.005 and 1.88 kJ kg^-1K^-1, respectively. In an energy conserving system, 1 kg s^-1air at 30 °C with constant absolute humidity of 0.02 kg water (kg dry air)^-1 is heated up to 65 °C. Water at the wet bulb temperature of air is then sprayed into the air so that the final temperature of the air-water vapour mixture is 40 °C. Latent heat of vapourization of water at 70 °C and 40 °C are 2334 and 2407 kJ kg^-1, respectively. The thermal energy supplied per second during heating in kW is

Ques 38 GATE 2013

Specific heat capacity of dry air and water vapour are 1.005 and 1.88 kJ kg^-1K^-1, respectively. In an energy conserving system, 1 kg s^-1air at 30 °C with constant absolute humidity of 0.02 kg water (kg dry air)^-1 is heated up to 65 °C. Water at the wet bulb temperature of air is then sprayed into the air so that the final temperature of the air-water vapour mixture is 40 °C. Latent heat of vapourization of water at 70 °C and 40 °C are 2334 and 2407 kJ kg^-1, respectively.The absolute humidity of the exhaust air from the spray chamber in kg water (kg dry air)^-1 is

Ques 39 GATE 2013

If 3 ≤ x ≤ 5 and 8 ≤ y ≤ 11 then which of the following options is TRUE?