A 240V DC shunt motor has a line current of 50A, The field and armature resistances are 120 ohms and 2,0 ohms respectively. Calculate the current passing through the field resistance and the back emf of the armature, Select the correct response: 3A and 100V 2A and 164V 1A and 150V 2A and 182V
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- A 230v DC series motor takes 30A when giving its rated output at 1400 rpm. It has a field resistance of 0,4 ohms, Calculate the value of the resistance (Ra) of the armature when Eb = 200V. Select the correct response: 0.2 ohms 0.6 ohms 0.8 ohms 0.4 ohmsA 240v DC series motor has an armature current and resistance of 30A and 0.2 ohms respectively. Calculate the value of the series field resistance if the back emf is 220V. Select the correct response: 0.1 ohms 0.8 ohms 0.3 ohms 0.5 ohmsA 220 V shunt motor driving its normal load draws an armature current of 50 A from a 220 V dc source. The armature resistance of this motor including brushes is 0.25 ohms. How much armature current (minimum) Will this motor draw from a 200 V DC source when driving the same load with the field adjusted to maintain the same speed.
- Reducing the supply voltage so that Vnew = Vold / V3 reduces the maximum torque of the motor so that Tmaxnew= ...Tmaxold . * .... ...Final 1A DC shunt motor is rated 10HP, 250V and is connected to 235V source. The armature resistance is 0.2 ohm, the field circuit resistance is 125 ohm and the total rotational losses are 380W. The motor is driving a load, and it draws an armature current of 30A, Calculate the output power. b) 41 d) 6490 6870 7492 7460 Boş birakA freewheeling DC motor is driven with 1000 rpm and a nominal load torque of 80Nm. The field circuit resistance is 200 and the armature circuit resistance is 0.2 O. The field coils are fed with a zero degree transmission angle through a single-phase fully controlled converter connected to a single-phase 240V source. The armature circuit is fed from a single phase 400V source through another fully controlled converter. Magnetic saturation has been neglected, the motor constant is given as 0.8 V - s / A - rad. Assuming that there is no fluctuation in armature and field current, find the control angle of the converter feeding the armature at nominal load. If you want to leave the question blank, click again on the option you marked.
- A 250 V series motor has an armature resistance of 0.2 ohm and a series-fieldresistance of 0.18 ohm. If the speed is 6oo RPM when the current is 32 amps.What will be the motor speed when the load is reduced so that the current is18 amps, under which condition the percent flux change is 50 % of the percentcurrent change.A universal motor has armature circuit resistance of 15 ohm and inductanceof 0.3H. On being connected to a 220 V dc supply, it draws 1.5 A from themains and runs at 2000 rpm. Find the speed and power factor of the motor,when connected to a 230 V, 25 Hz supply and drawing the same armaturecurrent.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.
- The current drawn by 220 V dc shunt motor of armature resistance 0.5 ohm and back emf 200 V isA 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.459. The current drawn by a 460 V dc motor of armature resistance 0.5 ohm and back emf 420 V is -