f121. A 400 V shunt motor takes a current of 120 A and runs at 1000rpm. The armature resistance is 0.2 ohm. Calculate the speed withthe same torque if magnetic flux is reduced to 80% of the initial.A. 1230 rpmB. 1240 rpmC. 1260 rpmD. 1250 rpm

Given: Supply Voltage, V = 400 VInitial Armature Current, Ia1 = 120 AArmature Resistance, Ra = 0.2…

Answered: f 121. A 400 V shunt motor takes a…

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter32: Three-phase Motors

Section: Chapter Questions

Problem 13RQ: A squirrel-cage induction motor is operating at 1175 RPM and producing a torque of 22 Ib-ft. What is...

See similar textbooks

Similar questions

hotors a) What power is developed by a motor that turns at 1200 rpm and has a torque of 3.0 N-m?
A 220 V series motor takes 15 A and runs at 700 rpm. The armature resistance including the resistance of the series winding is 0.8 ohm. At what speed will it run if a 2-ohm resistance is connected in series with supply voltage? Assume the motor is taking the same current.
A 230 V dc series motor has an armature resistance of 0.2 ohm and field resistance of 0.1 ohm at rated voltage. The motor draws a line current of 40 amperes and runs at a speed of 1000 rpm. Find speed of the motor for line current of 20 A at 230 V. Assume that flux at 20 A line current is 60% of flux at 40 A line current.
Please do not copy other answers is Wrong other wise I give Downvote. A 200 V dc series motor runs at 700 rpm when operating at its full load current of 20 A. The motor resistance is 0.52 and the be used if magnetic circuit can be assumed unsaturated. What will be speed if the load torque is increased by 44%.
1. The operation of Commutator in DC Motor is * O a) to convert dc to ac O b) to convert ac to dc O c) to convert fixed dc to variable dc O reverse the current direction in the rotating windings each half turn
A 250 V series motor has an armature resistance of 0.2 ohm and a series-fieldresistance of 0.18 ohm. If the speed is 6oo RPM when the current is 32 amps.What will be the motor speed when the load is reduced so that the current is18 amps, under which condition the percent flux change is 50 % of the percentcurrent change.
2. A 2-pole, 50 Hz induction motor supplies 15 kW to a load at a speed of 2950 rpm. a. What is the motor's slip? b. What is the induced torque in the motor in N-m under these conditions? c. What will be the operating speed of the motor be if its torque is doubled? d. How much power will be supplied by the motor when the torque is doubled?
A 240V dc series motor has armature and field resistances of 0.5 W and 1 W respectively. When running at 1200 rev min-1 the motor draws 15A from the supply. Calculate the torque delivered. A 2 W resistor is connected in series with the motor. The torque is adjusted so that the armature current remains unchanged. Calculate the new speed and torque
A 220-volt DC series motor is running at a speed of 800 r.p.m and draws 100 A. Total resistance of the armature and field is 0.1 ohm. 1. Calculate the speed when the torque is halved if the magnetic circuit is unsaturated. 2. If the torque was 250 N-m, calculate its new value when the current is doubled and the saturation is occurred
A 220 V DC series motor runs drawing a current of 30 A from the supply. Armature and field circuit resistances are 0.4 and 0.1 respectively. The load torque varies as the square of the speed. The flux in the motor may be taken as being proportional to the armature current. To reduce the speed of the motor by 50% the resistance in ohms that should be added in series with the armature is
Name three factors that determine the torque produced by an induction motor.
A 220V dc shunt motor takes 4A at no load and runs at 700 rpm. Ra = 0.60 ohm and Rsh = 110 ohms. What is the efficiency of the motor when the motor input is 8800 W? a. 81.67% b. 80.2% c. 82.05% d. 79.44%

SEE MORE QUESTIONS

Recommended textbooks for you

Delmar's Standard Textbook Of Electricity

Electrical Engineering

ISBN:

9781337900348

Author:

Stephen L. Herman

Publisher:

Cengage Learning

Delmar's Standard Textbook Of Electricity

Electrical Engineering

ISBN:

9781337900348

Author:

Stephen L. Herman

Publisher:

Cengage Learning

SEE MORE TEXTBOOKS

f 121. A 400 V shunt motor takes a current of 120 A and runs at 1000 rpm. The armature resistance is 0.2 ohm. Calculate the speed with the same torque if magnetic flux is reduced to 80% of the initial. A. 1230 rpm B. 1240 rpm C. 1260 rpm D. 1250 rpm