10. A short-shunt compound d.c. Generator supplies a current of 100 A at a voltage of 220 V. If the resistance of the shunt field is 50 2, of the series field 0.025 Q, of the armature 0.05 Q, the...


10. A short-shunt compound d.c. Generator supplies a current of 100 A at a voltage of 220 V. If the<br>resistance of the shunt field is 50 2, of the series field 0.025 Q, of the armature 0.05 Q, the total brush drop is<br>|2 V and the iron and friction losses amount to 1 kW, find<br>(a) the generated e.m.f. (b) the copper losses (c) the output power of the prime-mover driving the gen-<br>erator and (d) the generator efficiency.<br>[(a) 229.7 V (b) 1.995 kW (c) 24.99 kW (d) 88%]<br>11. A 20 kW, 440-V, short-shunt, compound d.c. generator has a full-load efficiency of 87%. If the<br>resistance of the armature and interpoles is 0.4 2 and that of the series and shunt fields 0.25 Q and 240 2<br>respectively, calculate the combined bearing friction, windage and core-loss of the machine.<br>[725 W]<br>12. A long-shunt, compound generator delivers a load current of 50 A at 500 V and the resistances of<br>armature, series field and shunt field are 0.05 ohm and 250 ohm respectively. Calculate the generated electro-<br>motive force and the armature current. Allow 1.0 V per brush for contact drop.<br>[506.2 V ; 52 A] (Elect. Engg. Banaras Hindu Univ. 1977)<br>

Extracted text: 10. A short-shunt compound d.c. Generator supplies a current of 100 A at a voltage of 220 V. If the resistance of the shunt field is 50 2, of the series field 0.025 Q, of the armature 0.05 Q, the total brush drop is |2 V and the iron and friction losses amount to 1 kW, find (a) the generated e.m.f. (b) the copper losses (c) the output power of the prime-mover driving the gen- erator and (d) the generator efficiency. [(a) 229.7 V (b) 1.995 kW (c) 24.99 kW (d) 88%] 11. A 20 kW, 440-V, short-shunt, compound d.c. generator has a full-load efficiency of 87%. If the resistance of the armature and interpoles is 0.4 2 and that of the series and shunt fields 0.25 Q and 240 2 respectively, calculate the combined bearing friction, windage and core-loss of the machine. [725 W] 12. A long-shunt, compound generator delivers a load current of 50 A at 500 V and the resistances of armature, series field and shunt field are 0.05 ohm and 250 ohm respectively. Calculate the generated electro- motive force and the armature current. Allow 1.0 V per brush for contact drop. [506.2 V ; 52 A] (Elect. Engg. Banaras Hindu Univ. 1977)

Jun 11, 2022
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