A d.c. series motor is running whith a speed of 800 r.p.m. while taking a current of 20 A from the supply. If the load is changed such that the current deawn by the motor is increased to 50 A , calculate the speed of the motor on new load . The armature and series field winding resistances are 0.2 ohm and 0.3 ohm respectively . Assume the flux

128. The hysteresis loss of a dc machine is 300 W when the flux per pole is 30 mWb and the machine is driven at 1000 rpm. How much Is the loss If the field is adjusted to produce 50 mWb per pole whlle the speed Is reduced to 900 rpm? A. 420 W B. 510 W C. 450 W D. 500 W

Determine the flux per pole for 6 pole dc machine having 240 wave connected conductors, which generates an open circuit voltage of 500 volt, which is running at 1000 rpm.

nid%3D11610 This course O d. Flux = 0.9 Wb, Speed = 473 rad/sec Clear my choice In a given DC motor, the output power is 20 HP, and the rotational losses are 1.1 KW. If the motor is operating at 87 % efficiency, find the converted power and the copper losses. Select one: O a. Peony =16 02 KW and Pa = 1.13 KW Ob. P.ry= 14.92 KW and P = 1.35 KW Oc None Od. Por= 1715 KW 3nd Pa-211kw Consider a shunt DC motor with an armature resistance RA -0.125 2 and terminal voltage VT =460V. TIhe motor rated speed is 1000RPM and the rated amature current is 100 A. The total field resistance is 260 Ohms

Kindly solve what is ask with complete solution so that I can understand. I want a handwritten solution. Thank you very much pois!!

a) A sinewave is having a frequency of 100 Hz and instantaneous value of 150 Volts at 1.4 milli seconds. Find i) The maximum value of sinusoidal voltage waveform and ii) The value of voltage at 1.8 milli seconds. b) Determine the instantaneous equation for the voltage waveform shown in figure, if Vp=100 Volts, Time period is 10 milli seconds and o =30 degrees. Vp t= 0 Upload your Answers steps in the "Final Answer Submission" Link provided in the Moodle. a) (i) Maximum value = a) (ii) Value of voltage at 1.8 ms b) Angular frequency =

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The maximum speed of an alternator working at 60 Hz is possible when the number of poles of the machine is ........ a. 4 b. 5 c. 3 d. 2

a) A sinewave is having a frequency of 100 Hz and instantaneous value of 100 Volts at 1.4 milli seconds. Find i) The maximum value of sinusoidal voltage waveform and ii) The value of voltage at 1.9 milli seconds. b) Determine the instantaneous equation for the voltage waveform shown in figure, if Vp=100 Volts, Time period is 10 milli seconds and 0 =30 degrees. Vp = 0 Upload your Answers steps in the "Final Answer Submission" Link provided in the Moodle. a) (i) Maximum value = a) (ii) Value of voltage at 1.9 ms = b) Angular frequency =

Q2. A 4-pole, wave-wound armature has 72 slots with two coil-sides per slot, each coil has four turns. If the flux per pole is 20 mWb and the armature rotates at 720 rpm, what is the induced emf across the armature? (Ans. 276.48 V) 0.05