Select the correct answer. Elden grows wheat on his land. However, his wheat farm is on a steep slope and hence more prone to soll erosion. In order to prevent soil
erosion, he rotates wheat with soybean. What type of soil conversion method did Elden use?
ОА.
Cover cropping and mulching
OB. Crop rotation
OC Contour farming
OD
Terrace farming
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Which of the following ziegler nichols tuning methods the response of the controller to a step input should exhibit an s-shaped curve? a)-open loop mode b)-closed loop mode c)-both modes (open & closed) d)-none of the modes (open & closed)

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]

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