exam3 - EE321 Exam 3 Spring 2007 Write your name and...

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EE321 Exam 3 Spring 2007 Write your name and student ID on the bluebook. Only turn in the bluebook. Notes : You must show work for credit. Getting 80% of problem 1 or 5 satisfies ABET objective 5. Getting 80% of problem 6 satisfies ABET objective 2. Handy trigonometric identities: () () () dx du u u dx d dx du u u dx d B A B A B A B A B A B A B A B A B A B A B A B A B A B A B A cos ) sin( sin ) cos( ) sin( ) sin( 2 1 cos sin ) cos( ) cos( 2 1 sin sin ) cos( ) cos( 2 1 cos cos sin sin cos cos ) cos( sin cos cos sin ) sin( = = + + = + = + + = = ± ± = ± m
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1.) 25 pts. A dc machine has the following parameters 1 . 0 = a r Ohm, 4 = aa L mH, 2 . 0 = v k Vs. The machine is fed from a buck converter. The dc voltage is 100 V, the forward switch drop is 2 V, and the forward diode drop is 1 V. If the rotor speed is 2000 RPM and the duty cycle is 0.6, compute (a) the average armature voltage, (b) the average armature current, (c) the efficiency of the machine, (d) the average current into the buck
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This note was uploaded on 02/19/2012 for the course ECE 321 taught by Professor Staff during the Spring '08 term at Purdue.

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exam3 - EE321 Exam 3 Spring 2007 Write your name and...

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