The torque developed by a dc series motor is 10 N-m when drawing 7 A. If the current is doubled, the tor developed becomes N-m.
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A: given Input power= 150W w=30 rad/sec torque,τ=3 N-m
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A: 1) As per our policy, i have attempted 3 parts .
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Q: The torque developed by a dc series motor is 44 N-m when drawing 17 A. If the current is doubled,…
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Q: The torque developed by a dc series motor is 10 N- m when drawing 7 A. If the current is doubled,…
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Q: The field windings of a series motor has a resistance of 120 ohms at 15 deg. C. After running for…
A: The solution can be achieved as follows.
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Q: The torque developed by a dc series motor is 32 N-m when drawing 17 A. If the current is doubled,…
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Q: 0) The input to 220 v d.c shunt motor is 11 k w Colculate a) the torque developed the efficiency c)…
A: Terminal voltage of the motor, V=220V Power input, P= 11kW
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Q: The induced torque in induction machines depends on Select one: Oa. The slip O b. The mechanical…
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Q: self excited DC generator field wit nergized by its own DC supply elect one: OTrue OFalse
A: DC generators can be classified into self excited and separately excited.
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Q: By increasing the flux of main pole of a dc motor, the speed will be reduced true False
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A: Need to find new torque
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A: Given data is written as follows:
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A: It is given that: V1=115 VR1=0.07ΩR'2=0.08ΩX1=0.4ΩX'2=0.2Ω
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A: Given data:
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- During stator voltage control of Induction motor drives, Relationship of Torque (T) with Vrms is given by a. T∝1/Vrms2 b. T∝1/Vrms c. T∝Vrms d. T∝Vrms2The field windings of a series motor have a resistance of 120 ohms at 15 o C. After running for two hours, the resistance increases to 140 ohms. If the temp. coefficient at 15 deg C is -0.00427, find the temp. rise.A DC motor is initially at rest and is then connected to a 12V battery. The motor has aresistance of 2 Ohms and an inductance of 0.5 Henrys. The motor has a torque constant of0.1 Nm/A and a back EMF constant of 0.1 V/(rad/s). Determine the current through themotor as a function of time, and the time it takes for the motor to reach 90% of its finalsteady-state speed.
- One of the most useful motor performance curves is the____ curve. a. Speed vs. resistance b. Torque vs. current c. Speed vs. current d. Torque vs. speedThe current generated by the waterwheel generator changes direction as the wheel rotates, that is, it is an alternating current. Could you design a simple generator like this that would induce a current that continuously flowed in one direction (a DC current)? If not, explain why not. If so, describe and sketch your model solution below.A permanent magnet dc motor has the following specifications Maximum speed = 500 rad/sec Maximum armature current = 2.0 A constant (K) = 0.06 V-s/rad Torque constant (Kb) = 0.06 N-m/A Frictional torque = 0.012 N-m Armature resistance = 1.2 ohms Armature inductance = 0.020 H Armature inertia = 6.2x10-4 N-m-s 2 /rad Armature viscous friction = 1x10-4 N-m-s/rad a) Determine the voltage/velocity and voltage/position transfer functions for this motor b) Determine the voltage/velocity and voltage/position transfer functions for the motor neglecting the electrical time constant
- A dc long shunt compound generators delivers a current of 80 A at 300 V. The armature, series field and shunt field resistances, are 0.05 Ω, 0.03 Ω, and 60 Ω. Find the induced emf.A permanent-magnet dc motor hasRA = 1.0 Ω. With no load, it operatesat 1000 rpm and draws 1.0 A from a 15 Vsource. Assume that rotational power lossis proportional to speed. Find the outputpower and efficiency for a load that dropsthe speed to 950 rpm.The shunt field winding of the DC motor has many turns of fine wire. Select one: True False
- A 230V series motor with 4-pole, 600 conductors wave-connected supplying a load of 7.5kW by taking 30A from the motors. Calculate the developed torque if the flux per pole is 15mWb and its armature circuit resistance is 0.5ΩA D.C. series motor of resistance 1 ohm between terminals runs at 800 r.p.m. at200 V with a current of 50 A. Find the speed at which it will run when connectedin series with a 5 ohms resistance and taking the same current.The field and armature resistances of a 220-V series dc motorare 0.2 ohms and 0.1 ohms respectively. The motor takes 30 A ofcurrent while running at 700 rpm. If the total iron and frictionlosses are 350 W, find the efficiency.