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7. A 2-pole d.c shunt motor operating from a 200 V supply takes a full load current of 35 A, the no load current being 2 A. The field resistance is 500 Q and the armature has a resistance of 0.6 Q. Calculate the efficiency

7. A 2-pole d.c shunt motor operating from a 200 V supply takes a full load current of 35 A, the no load current being 2 A. The field resistance is 500 Q and the armature has a resistance of 0.6 Q. Calculate the efficiency

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Electrical Machines D.C. Motor 7. A 2-pole d.c shunt motor operating from a 200 V supply takes a full load current of 35 A, the no load current being 2 A. The field resistance is 500 2 and the armature has a resistance of 0.6 N. Calculate the efficiency of the motor on full-load. Take the brush drop as being equal to 1.5 V per brush arm. Neglect temperature rise. [82.63%] 8. The input to a 220 V d.c. shunt motor is 11 kW. Calculate (i) the torque developed (ii) the efficiency (iii) the speed at this load. The particulars of the motor are: No-load current = 5A; No-load speed = 1150 r.p.m.; Armature resistance = 0.5 N; shunt field resistance = 110 2. [87.1 N.m; 79.6%; 1031 r.p.m.] 9. A 400 V d.c. motor running at 1200 r.p.m. takes an armature current of 32.8 A. The armature resistance is 0.5 2. If the load torque increases by 25% and the flux increases by 10%, find (i) armature current (ii) speed and (iii) output of the machine. Neglect iron and friction losses. [37.27 A; 1084.6 r.p.m.; 14.2 kW] 2
Transcribed Image Text:Electrical Machines D.C. Motor 7. A 2-pole d.c shunt motor operating from a 200 V supply takes a full load current of 35 A, the no load current being 2 A. The field resistance is 500 2 and the armature has a resistance of 0.6 N. Calculate the efficiency of the motor on full-load. Take the brush drop as being equal to 1.5 V per brush arm. Neglect temperature rise. [82.63%] 8. The input to a 220 V d.c. shunt motor is 11 kW. Calculate (i) the torque developed (ii) the efficiency (iii) the speed at this load. The particulars of the motor are: No-load current = 5A; No-load speed = 1150 r.p.m.; Armature resistance = 0.5 N; shunt field resistance = 110 2. [87.1 N.m; 79.6%; 1031 r.p.m.] 9. A 400 V d.c. motor running at 1200 r.p.m. takes an armature current of 32.8 A. The armature resistance is 0.5 2. If the load torque increases by 25% and the flux increases by 10%, find (i) armature current (ii) speed and (iii) output of the machine. Neglect iron and friction losses. [37.27 A; 1084.6 r.p.m.; 14.2 kW] 2
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