A DC 220V shunt motor draws a no load current of 3.5A.Its armature and shunt resistances...
- A DC 220V shunt motor draws a no load current of 3.5A.Its armature and shunt resistances are: 0.25 and 440 ohms. At full load it draws a current of 65.5 A . Find the efficiency of machine at full load.
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A DC 220V shunt motor draws a no load current of 3.5A.Its
armature and shunt resistances...
220 v dc shunt motor has Ra= 0.25 ohms and Rf=120 ohms . At no-load the...
220 v dc shunt motor has Ra= 0.25 ohms and Rf=120 ohms . At no-load the motor draws a current It=6A. And runs at 1500 rpm. At full-load the motor draws 62 A. the armature reaction at full load reduces the flux by 10%. Determine the rotational losses , motor speed at full-load, the shaft torque and efficiency.
A 6 hp, 180 V shunt dc motor draws a full-load current of 30 A from the power supply. The motor h...
A 6 hp, 180 V shunt dc motor draws a full-load current of 30 A from the power supply. The motor has a field (shunt) resistance of 150 Ω. The armature resistance of the motor is 0.1 Ω. When the motor speed is 1800 rpm (this is not the full-load speed), the relationship between the induced voltage
A 250 V, 10 KW, 1200 rpm dc shunt motor has a full load efficiency of...
A 250 V, 10 KW, 1200 rpm dc shunt motor has a full load efficiency of 80 percent. Its field and armature resistances are 110 ohms and .25 ohm respectively. Calculate the value of the resistance to be inserted in series with the armature and the power lost in the armature circuit to reduce the speed to 80 percent when the load torque is constant regardless of the speed.
A 220 V shunt motor runs at 1500 rpm at no load current of 3A. What...
A 220 V shunt motor runs at 1500 rpm at no load current of 3A. What will be its full load speed and output torque if it draws 30 A at full load. The shunt and armature resistances are 600 and 0.33 respectively 3.
A 250V DC shunt machine has an armature resistance of 0.5Ω and shunt field resistance of...
A 250V DC shunt machine has an armature resistance of 0.5Ω and shunt field resistance of 125Ω, when it is running as a motor, the current taken from the supply is 5A. Calculate the efficiency of the machine i) On no- load ii) As a motor when taking a current of 52A from the supply iii) As a generator when delivering a current of 35A. b) Distinguish between induction motor and synchronous motor.
A 250 V DC shunt motor has an armature resistance of 0.25 ohms and a variable...
A 250 V DC shunt motor has an armature resistance of 0.25 ohms and a variable field resistance. At a certain loading condition, the motor’s generated (induced) voltage is 245 V. Find what will be the motor’s new armature current when there is 1% decrease in the flux value?
Problem 6: A 230-V shunt motor has an armature resistance of 0.05 Ohms and a field resistance of 75 Ohms. The motor draws 7 A of line current while running light at 1120 rpm. The line current at a...
Problem 6: A 230-V shunt motor has an armature resistance of 0.05 Ohms and a field resistance of 75 Ohms. The motor draws 7 A of line current while running light at 1120 rpm. The line current at a certain load is 46 A. (a) What is the motor speed at this load? (b) At this load, if the field circuit resistance is increased to 100 Ohms, what is the new speed of the motor? Assume linearity between the flux...
3. A 20kW, 250V, 1000rpm shunt excited dc motor has armature and field resistances of 0.2...
3. A 20kW, 250V, 1000rpm shunt excited dc motor has armature and field resistances of 0.2 ohm and 2002. When the motor takes 80A rated current at rated conditions. Draw the equivalent circuit and calculate induced torque at 1200rpm. Explain the starting current limiting methods for DC motors. (30 pts) 4. Explain the conditions for parallel operation of synchronous generators. A three phase, wye connected, synchronous generator is rated 150 MW, 0.85 lagging power factor, 12.6 kV, 60 Hz, and...
A 240V compound machine with resistances of armature, shunt and series winding are 0.06ohm, 24ohm...
A 240V compound machine with resistances of armature, shunt
and series winding are 0.06ohm, 24ohm, 0.002ohm respectively. The
line current is 100A at 240V. find the Back EMF and the Armature
current when the machine is connected as
connected as:
a. Long shunt compound motor.
b. Short shunt compound motor.
6) A 240V compound machine with resistances of armature, shun and series winding are 0.062, 242, 0.022 respectively. The line current is 100A at 240V. find the Back EMF and...
03 (5pts): A 250-V shunt motor has an armature resistance of 0.25 Ohms and a field...
03 (5pts): A 250-V shunt motor has an armature resistance of 0.25 Ohms and a field resistance of 125 Ohms. At no-load the motor takes a line current of 5.0 A while running at 1200 rpm. If the line current at full-load is 62.0 A, what is the full-load speed? When the line current is 62 A, the field resistance is increased to 200 Ohms, what is the new speed of the motor?
A 220 V shunt motor runs at 1500 rpm at no load current of 3A. What will be its full load speed and output torque if it draws 30 A at full load. The shunt and armature resistances are 600 and 0.33 respectively 3.
Problem 6: A 230-V shunt motor has an armature resistance of 0.05 Ohms and a field resistance of 75 Ohms. The motor draws 7 A of line current while running light at 1120 rpm. The line current at a certain load is 46 A. (a) What is the motor speed at this load? (b) At this load, if the field circuit resistance is increased to 100 Ohms, what is the new speed of the motor? Assume linearity between the flux...
3. A 20kW, 250V, 1000rpm shunt excited dc motor has armature and field resistances of 0.2 ohm and 2002. When the motor takes 80A rated current at rated conditions. Draw the equivalent circuit and calculate induced torque at 1200rpm. Explain the starting current limiting methods for DC motors. (30 pts) 4. Explain the conditions for parallel operation of synchronous generators. A three phase, wye connected, synchronous generator is rated 150 MW, 0.85 lagging power factor, 12.6 kV, 60 Hz, and...
A 240V compound machine with resistances of armature, shunt
and series winding are 0.06ohm, 24ohm, 0.002ohm respectively. The
line current is 100A at 240V. find the Back EMF and the Armature
current when the machine is connected as
connected as:
a. Long shunt compound motor.
b. Short shunt compound motor.
6) A 240V compound machine with resistances of armature, shun and series winding are 0.062, 242, 0.022 respectively. The line current is 100A at 240V. find the Back EMF and...
03 (5pts): A 250-V shunt motor has an armature resistance of 0.25 Ohms and a field resistance of 125 Ohms. At no-load the motor takes a line current of 5.0 A while running at 1200 rpm. If the line current at full-load is 62.0 A, what is the full-load speed? When the line current is 62 A, the field resistance is increased to 200 Ohms, what is the new speed of the motor?
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