DC Motors: Correcting Armature Reaction and Torque Production
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Questions and Answers

What is the term for the difference between the magnetic poles of the earth and the true north and south?

  • Magnetic variation
  • Angle of declination (correct)
  • Magnetic deviation
  • Polar displacement

What is the characteristic of ferromagnetic materials?

  • They are only magnetized when an electric current is applied
  • They are easily magnetized (correct)
  • They can be magnetized but only temporarily
  • They cannot be magnetized at all

What is the symbol used to represent magnetic lines of force?

  • ψ (psi)
  • Β (beta)
  • Φ (phi) (correct)
  • λ (lambda)

What is the behavior of like poles when they interact with each other?

<p>They repel each other (B)</p> Signup and view all the answers

What type of material is copper classified as?

<p>Diamagnetic (C)</p> Signup and view all the answers

What is the primary function of the commutator in a DC motor?

<p>To maintain the correct polarity in the armature windings (C)</p> Signup and view all the answers

What is the effect of Counter EMF on a DC motor?

<p>It opposes the applied EMF (C)</p> Signup and view all the answers

What determines the amount of torque produced by a DC motor?

<p>The strength of both the magnetic field of the pole pieces and the armature (A)</p> Signup and view all the answers

What is the purpose of interpoles in a DC motor?

<p>To correct armature reaction (A)</p> Signup and view all the answers

What is the characteristic of a Series Motor?

<p>High torque and poor speed characteristics (A)</p> Signup and view all the answers

What is the primary mechanism by which a DC motor produces torque?

<p>Forces of attraction and repulsion of magnetism (D)</p> Signup and view all the answers

What is the primary factor in determining the strength of an electromagnetic field?

<p>The number of turns of wire around the core material (B)</p> Signup and view all the answers

What is the term for the ability of a core material to become magnetized?

<p>Permeability (C)</p> Signup and view all the answers

When current stops flowing, what happens to the core material?

<p>It remains magnetized for a period of time (D)</p> Signup and view all the answers

What is the purpose of the left-hand rule in electromagnetism?

<p>To determine the polarity of an electromagnet (A)</p> Signup and view all the answers

What are the three systems for measuring magnetism?

<p>English, CGS, and MKS (C)</p> Signup and view all the answers

What is the purpose of the Commutator in a DC generator?

<p>To change the AC in the armature into DC (B)</p> Signup and view all the answers

What type of armature winding is used for higher voltage lower current operations?

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

What is the term for the point at which there is 0 volts present in the commutator?

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

What are the three main types of field windings in a DC generator?

<p>Series, Shunt, and Compound (D)</p> Signup and view all the answers

What is the main principle behind the operation of a DC generator?

<p>Magnetic induction (B)</p> Signup and view all the answers

What is the function of the Brushes in a DC generator?

<p>To connect the armature to the outer circuit (B)</p> Signup and view all the answers

What is the function of the shunt field relay in a DC motor?

<p>To disconnect power to the armature if shunt field current drops below a certain value (C)</p> Signup and view all the answers

What is the unit of power equivalent to 1 Horsepower?

<p>746W (D)</p> Signup and view all the answers

What is the purpose of a hall effect sensor in a brushless DC motor?

<p>To indicate the exact position of the rotation of the armature (B)</p> Signup and view all the answers

What is the correct way to reverse the direction of rotation of a DC motor?

<p>By changing the 2 leads of the armature or the field, but not both (A)</p> Signup and view all the answers

What is the characteristic of a short shunt compound motor?

<p>The shunt field is in parallel with the armature only (B)</p> Signup and view all the answers

What is the purpose of the right-hand rule in motors?

<p>To determine the direction of thrust and the magnetic field and current (C)</p> Signup and view all the answers

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