A shunt DC motor rated at 30 HP, 200 V, 1200 RPM, 100 Amperes armature current. The armature resistance of the motor is RA = 0.052 and the field resistance R, =1602. The adjustable resistance in the field circuit Radj is currently set to 405. Due to armature reaction, the flux is reduced by 12% when loaded. The magnetization curve for this motor taken at a speed of 1200 RPM is given in tabular form below: 0 0.1 0.25 0.52 0.75 1.0 1.2 1.5 1.75 2.00 10 50 110 160 235 260 275 290 295 300 If, A EA,V If the motor is operating at its rated conditions: What is the shaft speed of this motor?

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A shunt DC motor rated at 30 HP, 200 V, 1200 RPM, 100 Amperes armature current. The armature
resistance of the motor is RA = 0.052 and the field resistance R₁ =16022. The adjustable
resistance in the field circuit Radj is currently set to 40.
Due to armature reaction, the flux is reduced by 12% when loaded.
The magnetization curve for this motor taken at a speed of 1200 RPM is given in tabular form below:
If, A
EA,V
If the motor is operating at its rated conditions: What is the shaft speed of this motor?
0
10
0.1 0.25 0.52 0.75 1.0 1.2 1.5 1.75 2.00
50 110 160 235 260 275 290 295 300
Select one:
O a. Speed n=1200 RPM
O b. Speed n = 1818 RPM
O c. Speed n= 1023 RPM
O d. None
Transcribed Image Text:A shunt DC motor rated at 30 HP, 200 V, 1200 RPM, 100 Amperes armature current. The armature resistance of the motor is RA = 0.052 and the field resistance R₁ =16022. The adjustable resistance in the field circuit Radj is currently set to 40. Due to armature reaction, the flux is reduced by 12% when loaded. The magnetization curve for this motor taken at a speed of 1200 RPM is given in tabular form below: If, A EA,V If the motor is operating at its rated conditions: What is the shaft speed of this motor? 0 10 0.1 0.25 0.52 0.75 1.0 1.2 1.5 1.75 2.00 50 110 160 235 260 275 290 295 300 Select one: O a. Speed n=1200 RPM O b. Speed n = 1818 RPM O c. Speed n= 1023 RPM O d. None
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