Circuit below is a two’s complement generator using J K flip flops. When control is 1 this circuit generates the two’s complement of these 7 flip flops. Delay of each flip flop from time that CP goes from 0 to 1 and its output will be completed is 10 ns and delay for each and gate is 5 ns and for or gates is 2 ns. What is the maximum delay and maximum frequency of this circuit?

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]