Electrical Engineering: Principles & Applications (7th Edition)
7th Edition
ISBN: 9780134484143
Author: Allan R. Hambley
Publisher: PEARSON
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Q- The armature resistance of a permanent magnet dc motor is 0.80. At no load, the
motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency
of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from
the same source will be
A 200 V dc series motor draws a current of 50 A while running at 600 rpm. The armature and series field resistances are 0.2 Ω and 0.1 Ω. Find the torque developed in the armature.
An 8-pole DC machine has a simplex wave-wound armature containing 200 coils of 10 turns each. The resistance of each turn is 0.01 Ω. The flux per pole is 0.004 Wb.
What is the internal resistance of the armature in ohms?
What is the current absorbed by this machine in amperes at the instant it's connected to a 100 Vdc source?
What is the internally generated torque produced by the armature of this machine in N-m at the instant it's connected to the 100 Vdc source?
With the DC machine connected to the 100 Vdc source, what is the steady state angular speed of the machine in rpm?
What is the internally generated voltage of the armature of this machine at steady state in volts?
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- A DC motor takes an armature current of 100 A at 440 V. The armature circuit resistance is 0.3 0. The machine has 6 poles and armature is lap-connected with 822 conductors, the flux per pole is 0.05 wb. Calculate the speed.arrow_forwardA 240-V series motor has an armature resistanceof 0.42Ω and a series-field resistance of0.18Ω . If the speed is 500 r/min when the current is36 A, what will be the motor speed when the loadreduces the line current to 21 A? (Assume a 3-Vbrush drop and that the flux is proportional to thecurrent.)arrow_forwardA 440 V d.c. Armature resistance of shunt motor is 0.25 Ω and field winding resistance is 220 Ω. A motor draws a current of 40 A from the mains and runs at 1500 rpm when it supplies some load. Now find the speed of the motor when a resistance of 0.8Ω is connected in series with the armature. Assume armature current constant. The shunt field flux remains constant.arrow_forward
- 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.arrow_forward6. The motion in DC motor can be increased by the following factors... (you may choose more than one) * a) Using a stronger magnet b) Increasing the potential difference c) Increasing the current d) Increasing the number of turns on the coilarrow_forwardA 220 V series motor runs at 800 r.p.m., when taking a current of 15 A. The motor has R, = 0.3 Q and R = 0.2 0.Find the resistance to be connected in series with the armature if it has to take the same current at the same voltage at 600 r.m.p.Assume flux is proportional to the current.arrow_forward
- hotors a) What power is developed by a motor that turns at 1200 rpm and has a torque of 3.0 N-m?arrow_forwardA 600 V series motor takes 120 A and operates at 900 rpm when the load is80 HP. If the effective circuit resistance is 0.20 ohm, calculate the HPoutput of the motor when the current drops to 90 A. assuming that the fluxis reduced by 20 %.arrow_forwardRunning at 1200 rpm from a 280-V source, a series-connected dc motor draws an armature current of 25 A. The field resistance is 0.2 Ω and the armature resistance is 0.3 Ω. Assuming that the flux is proportional to the field current, determine the speed at which the armature current is 10 A.arrow_forward
- (c) A dc series motor, connected to a 440 V supply, runs at 500 rpm when taking a current of 40 A. Calculate the value of resistance which, when inserted in series with the motor, will reduce the speed to 300 rpm, the gross torque being then half its previous value. The resistance of the motor is 0.2 ohm. Assume flux to be proportional to field current.arrow_forwardA DC series motor, running a fan at 1000 rpm, take 50 A from 250 V mains. The armature plus field resistance is 0.6 Q. If an additional resistance of 4.4 Q is inserted in series with the armature circuit, the motor speed (approximately) in case the field flux is proportional to armature current is rpm.arrow_forwardA dc shunt motor runs at 900 rpm from a 460 V supply when taking an armature current of 25 A. Calculate the speed at which it will run from a 230-V supply when taking an armature current of 15 A. The resistance of the armature circuit is 0.8 Ω. Assume the flux per pole at 230 V to have decreased to 75% of its value at 460 V.arrow_forward
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