A direct current shunt motor runs at 600rpm when drawing 60A from a 230V supply. Armature resistance is 0.20 and field resistance is 1150. Determine the speed when the current through the armature is 30A.
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- A 120 V shunt motor has an armature equivalent of 0.5 ohm and a field resistance of 60 ohm. At full load, the motor takes 10 A and the speed is 1000 rpm. At what speed must this motor maybe driven as a generator to deliver 10 A to an external load at 120 V?459. The current drawn by a 460 V dc motor of armature resistance 0.5 ohm and back emf 420 V is -A dc series motor has an armature resistance of 0.06 Q and series field resistance of 0.08 Q. The motor is connected to a 400 V supply. The line current is 20 A when the speed of the machine is 1100 rpm. When the line current is 50 A and the excitation is increased to 30%, the speed of the machine in rpm is 837 RPM 938 RPM 1003 RPM O 1100 RPM A d.c. series motor takes 40 A at 220 V and runs at 800 r.p.m. If the armature and field resistance are 0.2 Q and 0.1 Q respectively and the iron and friction losses are 0.5 kW, the torque developed in the armature and the output of the motor will be 80.5 N-m , 11.57 kW 96.2 N-m, 10.63 kW 99.3 N-m, 7.82 kW
- A 220 V DC series motor runs drawing a current of 30 A from the supply. Armature and field circuit resistances are 0.4 and 0.1 respectively. The load torque varies as the square of the speed. The flux in the motor may be taken as being proportional to the armature current. To reduce the speed of the motor by 50% the resistance in ohms that should be added in series with the armature isA 250 V d.c. shunt motor takes a current of 20 A. Resistance of shunt field winding is 200 ohm and the armature is 0.3 ohm. What is the current in the armature ?A 250V series motor draws a current of 40A. The armature resistance is 0.15 ohm and the field resistance is 0.05 ohm. Determine the maximum efficiency of the motor.
- A series motor runs at 800 rev/min when the voltage is 400V and the current is 25A. The armature resistance is 0.4 ohm and the series field resistance is 0.2 ohm. Determine the resistance to be connected in series to reduce the speed to 600 rev/min with the same current.A DC series motor of resistance 1 ohm across terminals runs at 1000 rpm at 250 V taking a current of 20 A. When an additional resistance of 6 ohm is inserted in series and taking the same current, the new speed would be ?A series motor runs at 800rpm when the voltage is 400v and the current is 25 ampere the armature resistance is 0.4ohm and the series field resistance is 0.2ohm determine the resistance to be connected in series to reduce the speed to 600rpm with same current
- A 220 V series motor takes 15 A and runs at 700 rpm. The armature resistance including the resistance of the series winding is 0.8 ohm. At what speed will it run if a 2-ohm resistance is connected in series with supply voltage? Assume the motor is taking the same current.A 220 V shunt motor has an armature resistance of 0.4 ohm and field resistance of 140 ohm. The motor draws 6 A at 1600 rpm at no load. Calculate the speed and shaft torque if the motor draws 52 A at rated voltage.assume that a series motor is taking the same current with the conditions that 440v motor takes a 25 a and runs at 800 rpm the armature resistance including the resistance of the series winding is 0.77ohms calculate the speed will it run if a 1.88 resistance is connected in series with the supply voltage