EE In House Review(DC Machines).pdf - EE In House Review...

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EE In House Review - Problem DC Machines Sample Problem 1. How many parallel paths do a 6 pole quadruple wave wound connected armature winding of a dc generator has? a. 24 c. 12 b. 6 d. 8 2. An 8 pole dc generator with 778 wave connected armature conductors and running at 500 rpm supplies a load of 12.5Ω resistance at a terminal voltage of 50 V. The Ra = 0.24Ω and R f = 250Ω. Find the flux per pole in mWb. 3. The output of shunt generator is 24 KW at a terminal voltage of 200 V. Ra = 0.05Ω, Rf = 40Ω. If iron and friction losses equal the copper losses at this load, the output of the engine driving the generator is 4. A shunt delivers 195 A at a terminal voltage of 250 V. The Ra = 0.02Ω and Rf = 50Ω. The iron and friction losses are equal to 950 W. Find the commercial efficiency of the generator. 5. A dc generator has a mechanical efficiency at 98.2% and an electrical efficiency of 95.9%. Find the commercial efficiency.
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