JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III AGRICULTURAL PROCESS ENGINEERING Previous Question Paper (May - 2018 - R15)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
Differentiate between cleaning and grading of agricultural produce.
Answer
Cleaning is the process of removing foreign materials, such as dust, stones, chaff, and stalks, from the agricultural produce based on physical properties like size, shape, and density. Grading is the process of sorting the cleaned produce into different quality groups or categories based on size, shape, color, weight, or maturity to ensure uniformity for marketing and processing.
Write a brief note on scope and importance of crop processing.
Answer
Crop processing is essential to convert raw agricultural produce into value-added, edible, or industrial products. Its scope includes reducing post-harvest losses, extending shelf life through preservation, improving nutritional quality, and facilitating convenient storage and transportation. It is vital for ensuring food security, increasing farmer income, and meeting consumer demand for processed food products.
Differentiate between drag and lift coefficient.
Answer
Sign in to view the complete answer paper.
Write a brief note on criterion for mixture effectiveness.
Answer
Sign in to view the complete answer paper.
Define screen effectiveness. Write its expression with usual notations.
Answer
Sign in to view the complete answer paper.
What are the various design considerations for air screen grain cleaners?
Answer
Sign in to view the complete answer paper.
What are the various methods of parboiling?
Answer
Sign in to view the complete answer paper.
List out the various material handling equipment.
Answer
Sign in to view the complete answer paper.
What are the various points to be considered for selection of belt conveyors?
Answer
Sign in to view the complete answer paper.
Write expressions to determine the capacity and power requirement for screw conveyors with usual notations.
Answer
Sign in to view the complete answer paper.
Part B
Give the classification of size reduction equipment. Explain the working principle of jaw crusher with neat sketch.
In a wheat milling experiment it was found that to grind 4.33 mm sized grains to IS sieve 35 (0.351mm opening), the power requirement was 8 kW. Calculate the power requirement for milling of wheat by the same mill to IS sieve 15 (0.157 mm opening) using i) Rittinger’s law ii) Kick’s law. Feed rate of milling is 200 kg/hour.
Answer
Sign in to view the complete answer paper.
Explain the construction and operation of burr mill with a neat sketch.
Give the classification of cutting machines. Briefly explain the slicing machine with a neat labeled diagram.
Answer
Sign in to view the complete answer paper.
Explain the construction and operation of specific gravity separator with a neat sketch.
What do you mean by aerodynamics of agricultural products? Differentiate between frictional drag and pressure drag.
Answer
Sign in to view the complete answer paper.
What is mixing and write the different types of mixers.
Explain the construction and operation of impeller agitator with a neat labeled diagram.
Answer
Sign in to view the complete answer paper.
Describe the working principle of pneumatic separator with a neat diagram.
During the evaluation of air screen grain cleaner with 2 screens, the following observations were recorded: i) The impurities present in feed were 5%. ii) The impurities present in clean grain outlet were 0.5%. iii) The outflow of blower contains 0.5% clean seed. iv) The outflow of the first screen contains 1.0% clean seed. v) The underflow contains 0.5% clean seed. Calculate the cleaning efficiency of the air screen grain cleaner.
Answer
Sign in to view the complete answer paper.
Derive an equation for constant pressure filtration.
Explain the construction and operation of rotary filter with a neat diagram.
Answer
Sign in to view the complete answer paper.
Explain the construction and operation of a rubber roll sheller with a neat labeled diagram.
What are the design considerations for threshing equipment?
Answer
Sign in to view the complete answer paper.
Briefly explain the CFTRI method of paddy parboiling with a neat sketch.
Briefly explain the construction and operation of a bucket elevator with a neat labeled diagram.
Answer
Sign in to view the complete answer paper.
A screw conveyor mounted on a 5 cm diameter shaft has screw pitch and diameter both equal to 28 cm. Estimate the actual capacity of conveying wheat weighing 750 kg/m3 while operating at 200 rpm. Assume wheat capacity as 50% of theoretical capacity for a screw length of 8 m. What hp motor will be required, if the material factor for wheat is 0.4?
Explain the construction and operation of pneumatic conveying equipment with a neat diagram.
Answer
Sign in to view the complete answer paper.
Design a bucket elevator of centrifugal type discharge to lift 3.5 tonnes of paddy per hour to a height of 20 m having a bulk density of 750 kg/m3. Find the speed and power requirement for the elevator. Assume any necessary data required.
Differentiate between centrifugal and gravity type discharge in bucket elevator. Which one is more efficient? Give reasons.
Answer
Sign in to view the complete answer paper.