A constant torque two - speed - motor is connected to the AC lines to run at high speed. This means thatthe motor is connected in a A. Parallel wye B Parallel delta C. Single wye D. Delta
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- At rated voltage, a 125 kw, 300-V long shunt compound system provides power with a stray power loss of 3.69 kW. The winding resistors are as follows: armature=0.023, series field=0.04, shunt field=75. Under this condition, find the efficiency of the system.A 6-pole lap-wound series motor is connected to a 250 V d.c. supply. The armature has 500 conductors and a resistance of armature resistance of 0.25 Ω and a series field resistance of 0.65 Ω .The flux per pole is 25 mWb. The chief engineer wants to use this motor for driving a lathe machine, do you agree? Explain.6-pole, 3-phase, 7.5 kW, 60 Hz, with 2% slip in a network with 220 V voltageparameters of a running ASM transferred to the stator; R1 = 0.294 Ω, X1 = 0.503Ω , R2′ =0.144 Ω, X2′ = 0.209 Ω, Xm = 13.25 Ω and stator core losses are neglected. Wind and friction losses are 400 W. Find the torque produced by the motor.
- The 50kW, 500V short compound DC generator has an armature resistance of 0.06 Ohms, a series field resistance of 0.04 Ohms and a shunt field resistance of 125 Ohms. The voltage loss on the brush is 2 V. Calculate the armature induced voltage at the load of the twigA shunt generator with a capacity of 200 kW and a voltage of 220 V has a shunt field resistance of 50 and constant losses of 1500 watts. Calculate the half load efficiency if the full load efficiency is 88 percent.A shunt generator delivers 1,000 W at 149 V to a load. If the armature resistance is 0 ohm, and the shunt field resistance is 56 ohms, calculate the shunt field current in ampere.
- A short composite motor draw or pulls stream a current of 50 A at a voltage of 220 V it rotates at a speed of 1200 rpm Calculate the reverse electromotive force if the resistance of the product is 0.04 ohm the resistance of the series windings is 0.01 ohm and the resistance of the parallel windings is 125 ohm then Calculate the torque generatedPlease solve 209V, three-phase, Six poles, Y-connected induction motor has the following parameter: R1=0.128 Ohm, R'2=0.0935 Ohm, Xeq=0.49 Ohm. the motor slip at full load is 2% and for a Fan-Type load, Calculate following below : I have the Final answers and I do need to step by step which the formula and solution. Please if you use handwriting to write clearly and big. Thanks, The final and correct answers are: Problem3 (Reducing supply voltage) a) motor speed: 1163.3 rpm, b) starting torque= 71.93 Nm, c)starting current=179.5A, efficiency= 93.04%A d.c. series motor draws 25 A from a 260 V line while running at 900 rpm. It has an armature resistance of 1.5 Ω and a series field resistance of 0.8 Ω. A diverter is to be added to the circuit so that the speed increases to 1200 rpm while the line current increases to 30 A. Find the value of the diverter resistance Rd . a) find the Rd mathmatically
- Six generators are operating in parallel supply a total current of 3500 A. Each machine has a field resistance of 60 ohms and an armature resistance of 0.01 ohm. The emfs generated of these generators are 250, 270 ,280, 290, 300, 310 volts respectively. Find the share of each of the generator.3- A shunt machine connected to 250V mains has an armature resistance (including brushes) of 0.120 and the resistance of the field circuit is 1000. Find the ratio of the speed as a generator to the speed as a motor. The line current in each case being 80AA self-excited shunt generator supplies a load of 12.5kW at 125 V, the field resistance is 25 ohms and the armature resistance is 0.1 ohms. The total voltage drop because of brush contact and armature reaction at this load is 3.5 V calculate the power generated.