The rotor inductance for the faulhaber series 1516 012s motor is 900 μh. if the current through a transistor switch changes at a rate of 1 a/μsec when switched off, what is the voltage generated across the rotor inductance? as an engineer, does this voltage level cause you to be alarmed? if so, what can be done to prevent potential damage to the circuit?

The higher the astm grain size number, the finer the gran is. a)-true b)-false

An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0

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]