DC Machine Components Quiz

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Questions and Answers

What is the primary role of the yoke in a DC machine?

  • To provide mechanical support and carry magnetic flux (correct)
  • To reduce eddy current losses
  • To reverse the direction of current in the armature
  • To generate electrical energy

Which component is responsible for producing the magnetic field in a DC machine?

  • End Covers
  • Shaft
  • Field Windings (correct)
  • Armature Core

How do armature windings contribute to a DC machine?

  • They house the commutator segments
  • They induce electromotive force when rotated in a magnetic field (correct)
  • They support the weight of the yoke
  • They reduce friction between moving parts

What function does the commutator serve in a DC machine?

<p>It reverses the direction of current in the armature windings (C)</p> Signup and view all the answers

What materials are commonly used to make brushes in a DC machine?

<p>Carbon or graphite (D)</p> Signup and view all the answers

What role do bearings play in a DC machine?

<p>They support the shaft and reduce friction (C)</p> Signup and view all the answers

What component reduces the reluctance of the magnetic path in a DC machine?

<p>Pole Shoes (A)</p> Signup and view all the answers

What is the purpose of the laminated structure of the armature core?

<p>To reduce eddy current losses (A)</p> Signup and view all the answers

Which component provides the main mechanical support for the poles in a DC machine?

<p>Yoke (A)</p> Signup and view all the answers

What purpose do end covers serve in a DC machine?

<p>To encase internal parts and support bearings (C)</p> Signup and view all the answers

Flashcards

What is the yoke in a DC machine?

The outer frame of a DC machine that provides support for the poles and acts as a protective cover. It also carries the magnetic flux produced by the poles.

What are the poles and pole shoes in a DC machine?

Parts attached to the yoke that carry the field windings. They spread out the magnetic flux and reduce the reluctance of the magnetic path.

What are field windings in a DC machine?

Coils of wire wound around the poles that produce the magnetic field when current flows through them.

What is the armature core in a DC machine?

The rotating part of the machine made of laminated steel sheets to reduce eddy current losses. It houses the armature windings.

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What are armature windings in a DC machine?

Coils of wire placed in slots of the armature core that cut the magnetic flux during rotation, inducing an electromotive force (EMF).

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What is the commutator in a DC machine?

A cylindrical structure made of copper segments insulated from each other, mounted on the shaft and rotating with the armature. It reverses the current direction in the armature windings, ensuring unidirectional torque.

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What are brushes in a DC machine?

Stationary components made of carbon or graphite that press against the commutator and conduct current between the rotating part and the external circuit.

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What is the shaft in a DC machine?

The rotating part of the machine that transfers mechanical power to or from the armature.

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What are bearings in a DC machine?

Components that support the shaft and allow it to rotate smoothly with minimal friction.

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What are the end covers of a DC machine?

These are placed at both ends of the machine to enclose the internal parts and provide support for the bearings.

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Study Notes

DC Machine Components

  • Yoke: Forms the outer frame, providing mechanical support and a protective cover. Carries the magnetic flux generated by the poles.

  • Poles and Pole Shoes: Attached to the yoke, these carry the field windings. The pole shoes distribute the magnetic flux and decrease magnetic resistance within the machine.

  • Field Windings: Coils of wire wound around the poles; generating magnetic field when current flows through them.

  • Armature Core: The rotating part of the machine; constructed from laminated steel sheets to minimize eddy current losses. Houses the armature windings.

  • Armature Windings: Coils of wire located in slots within the armature core. As the armature rotates, these windings intersect the magnetic field, inducing an electromotive force.

  • Commutator: A cylindrical structure of copper segments, insulated from each other. Mounted on the shaft and rotating alongside the armature; reversing the current direction in the armature windings for unidirectional torque.

  • Brushes: Stationary components made of carbon or graphite, pressing against the commutator. They conduct current between the rotating commutator and the external circuit.

  • Shaft: The rotating component; transferring mechanical power to or from the armature.

  • Bearings: Support the shaft, facilitating smooth and low-friction rotation.

  • End Covers: Located at both ends, they enclose internal parts and provide support for the bearings.

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