Selection of the transmitted spot or diffracted spots enables tem bright field and dark field imaging modes. 4. which aperture is used to select the diffracted spots that will contribute to the final image and where is it located? a. b. how is the aperture positioned for bright field and dark field imaging? displaced beam imaging? how is the incident beam altered to generate a dark field image?

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]