Question

1) A shunt generator supplies 195 A at 220 V. Armature resistance is 0.02 ohm, shunt field resistance is 44 ohm. If the iron and friction losses amount to 1600 watt, find (i) emf generated; (ii) copper losses; (iii) b.h.p. of the engine driving the generator. (iv) commercial, mechanical and electrical efficiency. 2) A 250 V, 20 kW shunt motor running at 1500 rpm has a maximum efficiency of 85% when delivering 80% of its rated output. The resistance of the shunt field winding is 125 ohms. Determine the efficiency and speed of the motor when it draws 100 A from the mains

          1) A shunt generator supplies 195 A at 220 V. Armature resistance is 0.02 ohm, shunt field resistance 
is 44 ohm. If the iron and friction losses amount to 1600 watt, find (i) emf generated; (ii) copper 
losses; (iii) b.h.p. of the engine driving the generator. (iv) commercial, mechanical and electrical 
efficiency.
2) A 250 V, 20 kW shunt motor running at 1500 rpm has a maximum efficiency of 85% when 
delivering 80% of its rated output. The resistance of the shunt field winding is 125 ohms. 
Determine the efficiency and speed of the motor when it draws 100 A from the mains

Added by Guillermo Y.

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