Problem 1 (Four points if only the correct answer is circled. No partial credit!

Question

Problem 1 (Four points if only the correct answer is circled. No partial credit!) Circle the best answer for the following questions a) In a drive system, the power processing unit is used to i) measure the power supplied by the utility ii) measure the power into the motor ii) convert power from the utility to the load iv) convert power from electrical to mechanical b) When using an electric circuit to model a mechanical system, a node voltage represents a i) torque ii) speed iii) inertia iv) damping c) In a magnetic circuit with an air gap. i) the flux in the air gap is zero ii) the mmf across the air gap is zero iii) the reluctance of the core can often be ignored iv) the reluctance of the air gap can often be ignored d) For a single switching power pole i) the voltage at the current port can easily be reversed ii) the average current at the voltage port is greater than the average current at the current port across the voltage port. across the voltage port ii) the average voltage across the current port is less than the average voltage ) the average voltage across the current port is greater than the average voltage

Explanation / Answer

Ans a) convert the power from electrical to mechanical.

Ans b) speed

Ans c) the reluctance of the core can often be ignored

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