Answered: If the Applied Voltage of a DC Shunt…

If the Applied Voltage of a DC Shunt motor is halved with the load torque doubled, the armature current will be calculate ?

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter30: Dc Motors

Section: Chapter Questions

Problem 4RQ

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Concept explainers

Motor Load, Torque, and Power Quality Requirement

An electric motor is a gadget that changes electrical energy into mechanical energy over to follow up on a mechanical burden. The weight set on the motor because of this mechanical movement is known as motor load. Appropriately matching the motor burden to the engine is vital to forestall harm to the engine or wasteful and unnecessary expensive activity. Engines perform such undertakings as moving a thing starting with one spot then onto the next, cutting it, changing its shape, etc. The motors might be evaluated as far as a few variables including power yield, voltage, current, and temperature. Harm to an engine might happen when it is worked under over the top engine load contrasted with its appraised limit.

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If the Applied Voltage of a DC Shunt motor is halved with the load torque doubled, the armature current will be calculate ?

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2. In a DC shunt motor, what will be the armature current at maximumload?
1.How does a DC Shunt motor work?2. In a DC shunt motor, what will be the armature current at maximumload?
4. Does the speed of a shunt motor increase or decrease when the armaturecurrent increases? 5. What is the advantage of decreasing the field current of a separately-excited dc motor below its nominal value?
At 50% of full load, the armature current drawn by a dc shunt motor is 40 A when connected to a 200 V supply. By decreasing the field flux , its speed is raised by 20%; this also causes a 10% increase in load torque. Calculate the percentage change in field current. The armature resistance including the brushes is 1 ohm. Neglect saturation and armature reaction.
1. Why is DC Motor current so high? 2. How can we reverse the direction of rotation of a DC motor? 3. Can a DC shunt motor be operated on AC supply? Explain.
1-D.C. shunt motor maintains a more constant speed under varying load. (True or False) 2-Dc shunt motor is best suited where low starting torque is required. (True or False) 3-The speed of d.c series motor is increased if the armature current is increased. (True or False)
The armature and shunt field resistance of a 500 V shunt motor are 0.1 and 100 ohms respectively. A resistance of 1.4 ohm is connected in series with the armature and it runs at 1000 r.p.m., taking a current of 75 A. What must be the resistance of divertor connected across the armature to reduced the speed to 600 r.p.m.Assume armature current to be constant.
Questions: 1 - why does the speed fall slightly when the d.c. shunt motor is loaded? 2- What is the effect of armature reaction in on the speed of the motor? 3- Discuss the behavior of the efficiency output power curve? 4 - Enumerate different losses which take place in a loaded shunt motor ؟
A 230 volt shunt motor runs at 800 rpm and takes an armature current of 50amperes. Find the resistance to be connected in series with the field circuit toincrease the speed to 1000 rpm at an armature current of 80 amperes. Assume theflux to be proportional to the field current. Armature resistance = 0.15 ohm and fieldwinding resistance = 250 ohms.
2. What happens if the additional resistance is added in series with armature? 3. What will happen if the field circuit of the DC motor is open circuited while it is running at rated speed? 4. Explain theory of a separately excited DC motor.
The characteristic (Speed versus armature current) of a dc shunt motor is known as the electrical characteristics. (True or False)
ONE SENTENCE ONLY. how do we maximize the value of the armature current in a shunt dc motor in the event of increased load and maintain the input power supply constant?