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barcode reader code in c# net HOMEWORK PROBLEMS in Software
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032 and a eld resistance of 110 ohms At no load the armature current is 6 A and the speed is 1,800 rpm Part III
Electromechanics
Assume that the ux does not vary with load and calculate: a The speed of the motor when the line current is 62 A (assume a 2volt brush drop) b The speed regulation of the motor 018 If the speed is 500 rev/min when the current is 36 A, what will be the motor speed when the load reduces the line current to 21 A (Assume a 3volt brush drop and that the ux is proportional to the current) 176 A 120V, 10A shunt generator has an armature
resistance of 06 The shunt eld current is 2 A Determine the voltage regulation of the generator
1715 A 220VDC shunt motor has an armature
resistance of 02 and a rated armature current of 50 A Find a The voltage generated in the armature b The power developed 177 A 50hp, 550volt shunt motor has an armature
resistance, including brushes, of 036 ohm When operating at rated load and speed, the armature takes 75 amp What resistance should be inserted in the armature circuit to obtain a 20 percent speed reduction when the motor is developing 70 percent of rated torque Assume that there is no ux change 1716 A 550volt series motor takes 112 A and operates
at 820 rev/min when the load is 75 hp If the effective armaturecircuit resistance is 015 , calculate the horsepower output of the motor when the current drops to 84 A, assuming that the ux is reduced by 15 percent 178 A 20kW, 230V separately excited generator has
an armature resistance of 02 and a load current of 100 A Find: a The generated voltage when the terminal voltage is 230 V b The output power 1717 A 200VDC shunt motor has the following
parameters: Ra = 01 Rf = 100
179 A 10kW, 120VDC series generator has an
armature resistance of 01 and a series eld resistance of 005 Assuming that it is delivering rated current at rated speed, nd (a) the armature current and (b) the generated voltage When running at 1,100 rev/min with no load connected to the shaft, the motor draws 4 A from the line Find E and the rotational losses at 1,100 rev/min (assuming that the strayload losses can be neglected) 1718 A 230VDC shunt motor has the following
parameters: Ra = 05 Rf = 75 Prot = 500 W (at 1,120 rev/min) When loaded, the motor draws 46 A from the line Find a The speed, Pdev , and Tsh b If Lf = 25 H, La = 0008 H, and the terminal voltage has a 115V change, nd ia (t) and m (t) 1710 The armature resistance of a 30kW, 440V shunt
generator is 01 Its shunt eld resistance is 200 Find a The power developed at rated load b The load, eld, and armature currents c The electrical power loss armature and eld resistances of 2 and 333 The generator is operating at the rated speed of 3,600 rev/min Find the noload voltage of the generator and terminal voltage at half load

