Asingle-phase motor vibrates at a fre¬quency of 100 hz. what is the fre¬quency of the power line? b. a capacitor-run motor does not have to be set in a resilient mounting. why? c. a 4-pole, 60 hz, single-phase hysteresis motor develops a torque of 6 in·lb when running at 1600 rpm. calculate the hysteresis loss per revolution [j].

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]