A 10 kW, 250 V, dc shunt motor with an armature resistance of 0.8 ohm and a field resistance of 275 ohms takes, 3.91 A, when running light at rated voltage and rated speed. Calculate the machine efficiency as a generator when delivering an output of 10 kW at rated voltage and speed and as a motor drawing an input of 10 kW.
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- A 10-hp (7.46 kW), 250-V. shunt motor takes a line current of 5 A. when running light. Calculate the efficiency when delivering full load output, if the armature and field resistances are 0.5 Ω and 250 Ω respectively. At what output power will the efficiency be maximum?A 10-hp (7.46 kW), 250-V. shunt motor takes a line current of 5 A. when runninglight. Calculate the efficiency when delivering full load output, if the armature andfield resistances are 0.5 Ω and 250 Ω respectively. At what output power will theefficiency be maximum?(use 2-decimal digits for solution) A 10-hp (7.46 kW), 250-V. shunt motor takes a line current of 5 A. when runninglight. Calculate the efficiency when delivering full load output, if the armature andfield resistances are 0.5 Ω and 250 Ω respectively. At what output power will theefficiency be maximum?
- A 10 kW, 250 V, dc shunt motor with an armature resistance of 0.8 Ω and a field resistance of 275 Ω takes 3.91A, when running light at rated voltage and rated speed. What conclusions can you draw from the above data regarding machine losses? Calculate the machine efficiency as a generator when delivering an output of 10 kW at rated voltage and speed and as a motor drawing an input of 10 kW. What assumption if any do you have to make in this computation?Q/ A separately excited DC motor running at speed = 1100 rpm and has the following specifications: Terminal voltage = 238 V, field voltage = 240 V, armature resistance = 0.023 Ω, field resistance = 240 Ω. and the armature current = 118 A. While supplying constant torque, what is the new speed of the motor if the supply voltage is increased to 250 V?A shunt motor was tested by means of a pony brake having a length arm of 4 ft and a tare weight of 6.3 lbs. The current drawn by the machine from a 250-V line was 59.0 A when the scale reading was 24 lbs and the speed of the motor was 1200 rpm. The armature and shunt field resistances of the machine are 0.1 ohm and 240 ohms, respectively. Determine the following: Torque of the motor, lb-ft Output power, HP counter emf, volts power developed, watts rotational losses, watts
- The armature resistance of a 30-kW, 440-V shuntgenerator is 0.1Ω . Its shunt field resistance is 200Ω . Finda. The power developed at rated load.b. The load, field, and armature currents.c. The electric power loss.Q3 A 200v series motor takes a total current of 40A and runs at 900 rpm. If the armature and field resistances are 0.20 and 0.10 respectively. Iron and friction loss are 0.4 Kw, find the output power of the motor, efficiency and the torque developed in the armatureA 20 kW, 480-V shunt generator, having an armature resistance of 0.15 Ω and a field resistance of 200 Ω, delivers full-load at rated voltage and 1200 r/min. The machine is now run as a motor while taking 20 KW at 480 V. What is the speed of the motor
- A 25kW, 120V separately excited dc machine has an armature resistance of Ra =0.025 ohms. When operated with a constant field current and constant speed of 2500rpm, the open circuit armature voltage is 120V. If the dc machine is connected to a 125V supply, determine (i)Whether the dc machine is operating as a generator or a motor. (ii)The armature current (iii)The supply power (iv)The developed power. (v)The developed torque.The speed of a 230 V shunt motor is to be reduced from 900 r.p.m to 600 r.p.m. The resistance of the armature circuit is 0.3 ohm. When the motor current is 30 A, speed is 900 r.p.m. If the current reduces to 20 A at lower speed, what arrangement should be made? Neglect any effect not included in the data given.A dc shunt motor operating at an armature terminal voltage of 125 V is observed to be operating at a speed of 1180 r/min. When the motor is operated unloaded at the same armature terminal voltage but with an additional resistance of 5Ω in series with the shunt field, the motor speed is observed to be 1250 r/min. i. Calculate the resistance of the series field. ii. Calculate the motor speed which will result if the series resistance is increased from 5Ω to 15Ω.