Question 14(multiple choice worth 3 points)
(lesson 7.2 lc)
the daily driving limit for time spent behind the wheel should be no more than
o two hours
otwo to four hours
o six to eight hours
o a maximum of 12 hours

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]