in DC shunt motor if the supply voltages 400 volt armature resistance 0.5 ohm and armature current at no load is 5A and at full load 50A the speed of DC motor at full load is 1200 RPM then examine following determine the ratio of back EMF Patna allowed to full load Evaluate Speed of motor at no load Calculate the back emf of dc machine at full load Calculate the speed of dc motor at no load if full load speed becomes 1500rpm

in DC shunt motor if the supply voltages 400 volt armature resistance 0.5 ohm and armature current at no load is 5A and at full load 50A the speed of DC motor at full load is 1200 RPM then examine following determine the ratio of back EMF Patna allowed to full load Evaluate Speed of motor at no load Calculate the back emf of dc machine at full load Calculate the speed of dc motor at no load if full load speed becomes 1500rpm

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter43: About Dc Motors

Section: Chapter Questions

Problem 1SQ

See similar textbooks

Similar questions

H.W 1) A 4-pole, 500 V d.c. shunt motor has 720 wave-connected conductors on its armature. The full-load armature current is 60 A and the flux per pole 0.03 Wb. The armature resistacne is 1.2 Q and the contact drop is 1 V per brush. Calculate the full-load speed of the motor. H.W 2) A d.c. series motor with series field, and armature resistance of 0.06 ohm and 0.04 ohm respectively is connected across 220 V mains. The armature takes 40 A, and its speed is 900 rpm. Determine its speed when the armature takes 75 A, and excitation is increased by 15% due to saturation.
A 400V D.C. shunt motor takes 5 A at no-load. R = 0.5 ohms, R,= 200 ohms. What is the ratio %3| %D a f of speed from full load to no-load, when the D.C. shunt motor takes 50 A on full load? (b) 0.8 (d) 0.4 (а) 0.94 (c) 0.6
4-What is the main function of a diverter used in series wound DC motor? 5- What is the main difference between (iron and friction losses) and copper (Cu) losses in DC generators? 05
The DC shunt generator with the terminal voltage 350 V, armature drop 7 V and the each brush drop 2 V, then the value of generated emf is
d.c. series motor has a wave wound armature with 180 conductors. The armature resistance and the field winding resistance are 0.10 ohm ando.2 ohm respectively. If the motor is drawing 40 A current at 0.015 Wb flux per pole, then the speed under this condition is 2533.3 rpm 2644.4 rpm 2756.9 rpm 2987.6 rpm O
discuss how the dc motor is used in washing machine
generator is 600 RPM, and on load generated voltage is 110 V. Calculate 03) A 4 pole wave wound short shunt compound DC Generator supplies a current of 100 A to a load of 10 KW through a cable of resistance Rcable is hundred times the resistance of one of the armature conductor, given that the series field resistance is 0.02 ohm, shunt field resistance is 200 ohm, flux per nole is 0.3 Web, total number of armature conductors is 120, speed of armature resistance. 1.
True O False The RMS value of current, if the value of armature current is 14 A, a = 54 degrees, and B = 155 degrees is %3D Ia a+TT B+TT a 10.49 2.80 79.38 4.97 A Switched reluctance motor has a phase sequence of A-B-C while rotating clockwise. Phase sequence while rotating anti clockwise is
4. What for brushes are employed in DC generator? 5. What is the function of armature in a DC generator? 6. What is the function of commutator in a DC machine in generator action. 7 Whieh diffe u0ad in
7. A 4-pole, 500V shunt motor has 720 wave connected conductors on its armature. The full-los armature current is 60A and flux per pole is 0.03 Wb. The armature resistance is 0.020 and th contact drop per brush is 1V. then the full-load speed of the motor is -- a) 675 r.p.m. b) 690 r.p.m. c) 705 r.p.m. d) none of the previous,
1.4 A dc shunt generator when driven without connecting field winding shows an open circuit terminal voltage of 12 V. When field winding is connected and excited, the terminal voltage drops to zero because (a) field resistance is higher than critical resistance (b) there is no residual magnetism in the field circuit (c) field winding has got wrongly connected (d) there is a fault in armature circuit
A 120 V shunt generator running at 850 rpm has its armature and shunt field resistance of 0.15 ohm and 50 ohm respectively. It supplies 200 lamps each rated at 60 W, 100 V. The friction and windage and core loss of the machine is 400 W. its armature copper * loss on full load and shunt field loss is 2156.7 W, 240 W 2232.6 W, 240 W O 2232.6 W, 200 W 2156.7 W, 200 W O