A system has a generator and two motors (Motor# 1 and Motor#2). Motor# 1 has an

Question

A system has a generator and two motors (Motor# 1 and Motor#2). Motor# 1 has an efficiency of 75% and draws 100A from a 240VAC source. The generator has an efficiency of 90%. Motor#2 is operating at 2400 r/min with a torque of 59.69 N-m. The shaft of Motor# 1 is connected to the shaft of the generator. The electrical output of the generator is connected to the electrical input of Motor#2. What is the efficiency of Motor#2? 71.4% 82.4% 87.0% 92.6% A 2 50 V d.c. generator supplies a current of 25 A when running at 1200 rev/min. If the torque on the shaft the generator is 35.8 Nm, determine the efficiency of the generator, and the power loss In the 81 %, 720 W 80 %, 750 W 83.4%. 748.8 W 82 %. 780 W

Explanation / Answer

30)

The efficiency =outpot/input*100

                    =V*I/[(2pi/60)*N*T]*100

                    =[25*150/(2pi/60)*1200*35.8]*100

                   =[3750/4496.48]*100 =83.4%

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