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Q1:- A 3-phase induction motor has an output a 37KW at this load the stator copper loss and rotor copper loss each equal the stator iron loss. The mechanical losses are one - third of on load loss. Calculate the slip at this load ? when efficiency = 90%

Q1:- A 3-phase induction motor has an output a 37KW at this load the stator copper loss and rotor copper loss each equal the stator iron loss. The mechanical losses are one - third of on load loss. Calculate the slip at this load ? when efficiency = 90%

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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أسئلة سنوات سابقة Q1:- A 3-phase induction motor has an output a 37KW at this load the stator copper loss and rotor copper loss each equal the stator iron loss. The mechanical losses are one - third of on load loss. Calculate the slip at this load ? when efficiency = 90% Q2 :- A 3-phase, 4 pole, 50 Hz , slip ring I.M it is full load speed is 1440 rpm if the rotor resistance is 0.25 ohm/phase. Find the value external resistance to be connected to the rotor winding to reduce speed to 1200 rpm ( the torque is remain constant) Q3:- A 3-phase, 4 pole, 400 V , 50HZ , 20KW , IM , it is full load speed is 1470 rpm at critical slip the rotor copper losses increased 8 times compared with full load value find Mm and Ms ( neglect Z1 and Pfw ) Q4:- 3-phase, 6 pole, 400V 50HZ , I.M , has the stand still impedance of ( 0.04 +j 0.44 ) ohm/phase and emf between open slip ring 100 . Find Ms , output power , Torque .when Mm = 2 Q5:- A 3-phase, 8 pole, 380 V , 50HZ , I.M it is stator winding is delta connected and rotor Y-connected with T1/T2 = 2 if Z1=Z2= 0.3 + j2.5 .find 1- Developed torque at 735 rpm 2- The addition resistance to be added to rotor winding to reduce the rotor speed to 675 rpm at the same torque. Q6- A 6-pole generator having a 3-phase ,star connected winding. To induce a line voltage of ( 3300 V ) at no load if required flux of 33.15 mWb/pol at 50 HZ frequency. Find total number of slot and the number of conductor per slot if the slot pitch is 20 and coils of full span Q7:- A 3-phase, 4 pole, I.M,developing a maximum torque at speed 1320 rpm .The resistance of star connected winding is 0.3 ohm/phase. Determine the value of the resistance of be connected to the rotor winding make the starting torque 60% of maximum torque Q8:- A 3-phase,6ploe ,400V,50HZ,I.M, it is rotor winding
Transcribed Image Text:أسئلة سنوات سابقة Q1:- A 3-phase induction motor has an output a 37KW at this load the stator copper loss and rotor copper loss each equal the stator iron loss. The mechanical losses are one - third of on load loss. Calculate the slip at this load ? when efficiency = 90% Q2 :- A 3-phase, 4 pole, 50 Hz , slip ring I.M it is full load speed is 1440 rpm if the rotor resistance is 0.25 ohm/phase. Find the value external resistance to be connected to the rotor winding to reduce speed to 1200 rpm ( the torque is remain constant) Q3:- A 3-phase, 4 pole, 400 V , 50HZ , 20KW , IM , it is full load speed is 1470 rpm at critical slip the rotor copper losses increased 8 times compared with full load value find Mm and Ms ( neglect Z1 and Pfw ) Q4:- 3-phase, 6 pole, 400V 50HZ , I.M , has the stand still impedance of ( 0.04 +j 0.44 ) ohm/phase and emf between open slip ring 100 . Find Ms , output power , Torque .when Mm = 2 Q5:- A 3-phase, 8 pole, 380 V , 50HZ , I.M it is stator winding is delta connected and rotor Y-connected with T1/T2 = 2 if Z1=Z2= 0.3 + j2.5 .find 1- Developed torque at 735 rpm 2- The addition resistance to be added to rotor winding to reduce the rotor speed to 675 rpm at the same torque. Q6- A 6-pole generator having a 3-phase ,star connected winding. To induce a line voltage of ( 3300 V ) at no load if required flux of 33.15 mWb/pol at 50 HZ frequency. Find total number of slot and the number of conductor per slot if the slot pitch is 20 and coils of full span Q7:- A 3-phase, 4 pole, I.M,developing a maximum torque at speed 1320 rpm .The resistance of star connected winding is 0.3 ohm/phase. Determine the value of the resistance of be connected to the rotor winding make the starting torque 60% of maximum torque Q8:- A 3-phase,6ploe ,400V,50HZ,I.M, it is rotor winding
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