Jawaharlal Nehru Technological University Hyderabad B. Tech III AGRICULTURAL PROCESS ENGINEERING Previous Question Paper (November/December - 2018 - R15)

What are the benefits of size reduction?

How do you estimate the fineness of ground materials?

How do you determine the rate of mixing in a mixing operation?

Write in brief about mixers used for dry solids and granular materials.

A centrifuge having diameter of 20 cm is rotating at 10000 rpm. What is the separation factor? Take π = 22/7, g = 9.81 ms^-2.

Derive an expression for overall effectiveness of a two components separating screen.

List various improved paddy parboiling methods?

What are the limitations of flat belt and screw conveyors?

What are the nutritional changes occur during parboiling of paddy.

How capacity of bucket elevator is calculated?

Elaborate the Principles of size reduction.

A hammer mill required 10.6 kW power to crush spherical grains of 20 mm diameter into 2 mm diameter particles at a feeding rate of 5.2 kg/s, if the capacity is reduced to 2.5 kg/s and particles diameter to 3.0 mm, what should be the power consumption?

In a ball mill if ‘R’ is the radius of the mill, ‘g’ is acceleration due to gravity and ‘r’ is the radius of the ball, derive a relationship for critical speed calculation.

Peas of average particle diameter of 8 mm have been grounded to 0.0015 mm size employing a 6 KW motor. If the grinding of the material has to be further fine, half that of above size, will the same motor capacity be sufficient, and else how much additional power is required. Consider Rittinger’s equation.

Derive an expression for power requirement for liquids mixing.

Discuss about drag and drag coefficient.

Solid particles of coffee extract from a dryer having a dia of 400 µm are falling though air at temp. of 475 K. The density of particles is 1050 kg/m³ and density of air is 0.95 kg/m³. If the viscosity of air is 2.45×10^-5 Pa.s, calculate the terminal velocity and distance of fall in 10 s.

How do you calculate the required power of the mixer?

Enumerate various configurations equipment used for agitation with clean sketch.

List out various oil seeds processing equipment.

A farmer gets 2500 kg of paddy milled in a rice mill. Paddy contains 5.6% impurities and 21.4% husk. The brown rice is polished to a degree of 6.8% and the resultant milled rice contains 16.3% brokens. Calculate all the milling products and by-products of the milling operation. Also, calculate the total yield and head yield assuming no losses.

With the help of a process flow diagram explain various stages followed in a ultra modern rice mill?

What are the advantages of mini rice mill used in rice processing?

Classify different rice polishing equipment based on working principles.

What are the different mechanical handling devices used in milling systems?

A bucket elevator was used to lift and fill an empty silo of 30 tonnes capacity with paddy. The volume of each bucket was 3980 cc. The belt is being operated over a 60 cm head pulley with a linear speed such that the grain gets discharged centrifugally. The grain weighs 540 kg/m³ and has to be lifted to 10 m height. By mistake the bottom discharge chute having 10 cm dia was kept open. If the equivalent dia of the grain which is being filled is 1.2 cm, find out the actual period of filling the silo. The angle of repose of paddy is 46°.

A bucket elevator has 25.4 cm wide belt and 24.38 m tall. The buckets are 22.9 × 15.2 cm and are spaced 20.3 cm apart. What is the maximum speed that will not overload a 7.5 H.P. motor and capacity it can handle per hour at that speed?

What are the criteria considered in selection of the proper conveying systems?