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DC Machines and Transformers: Characteristics and Equivalents

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DC Machines and Transformers: Characteristics and Equivalents

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Questions and Answers

What is the characteristic of a series motor compared to separately and shunt excited motors?

It has a higher efficiency at low speeds

It has a lower starting torque

It has a constant speed regardless of load

It requires less current for the same torque (correct)

What is the main advantage of a compound motor over a shunt motor?

It provides high starting torque (correct)

It has lower maintenance requirements

It is more cost-effective

It operates at a more constant speed

How does the total field flux of a compound motor differ from that of a shunt motor?

It is always lower than that of a shunt motor

It depends on the combination of series and shunt field strengths (correct)

It is inversely proportional to the armature current

It remains constant regardless of load variations

What happens to the speed of a differential compound motor when the series field strength increases?

<p>The speed decreases</p> Signup and view all the answers

What is the relationship between armature voltage, field flux, and torque in speed control of DC motors?

<p>The speed is directly proportional to armature voltage and inversely proportional to field flux and torque</p> Signup and view all the answers

DC Machines and Transformers: Characteristics and Equivalents

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Podcast

Questions and Answers

What is the characteristic of a series motor compared to separately and shunt excited motors?

What is the main advantage of a compound motor over a shunt motor?

How does the total field flux of a compound motor differ from that of a shunt motor?

What happens to the speed of a differential compound motor when the series field strength increases?

What is the relationship between armature voltage, field flux, and torque in speed control of DC motors?

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