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Self Excited DC Generator and DC Motor Module 3 Quiz

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Questions and Answers

What is the purpose of the field winding in a DC generator?

To produce the armature conductors
To provide a path of low reluctance for the flux
To produce the magnetic flux (correct)
To collect current from the armature windings

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

To house the armature conductors
To magnetize the pole
To provide a path of low reluctance for the flux
To facilitate the collection of current from the armature windings (correct)

What is the difference between lap windings and wave windings in a DC machine?

Lap windings are suitable for low voltage, high current machines, while wave windings are suitable for high voltage, low current machines (correct)
Lap windings and wave windings are both suitable for low voltage, high current machines
Lap windings and wave windings are both suitable for high voltage, low current machines
Lap windings are suitable for high voltage, low current machines, while wave windings are suitable for high current, low voltage machines

What is the purpose of the armature core in a DC generator?

To provide a path of very low reluctance to the flux through the armature (B) Signup and view all the answers

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

To collect current from the armature windings (A) Signup and view all the answers

What is the purpose of field excitation in a DC generator?

To energize the field windings and set up a steady magnetic field (A) Signup and view all the answers

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

It is the stationary part of the machine (D) Signup and view all the answers

Which material is commonly used to make the yoke of a DC generator?

Steel (D) Signup and view all the answers

What is the main function of the rotor in a DC generator?

Converts electrical energy into mechanical energy (B) Signup and view all the answers

What type of DC generator has field magnets energized by their own supplied current?

Self-excited DC generator (C) Signup and view all the answers

At what condition does a DC generator achieve maximum efficiency?

When the constant losses are equal to the variable losses (B) Signup and view all the answers

In a DC generator, what do the pole shoes do?

Represent the direction of thrust on the conductor (B) Signup and view all the answers

What is the voltage regulation of a DC generator?

The percentage rise in the terminal voltage when the load is removed (A) Signup and view all the answers

Which part of a DC generator helps link an electrical energy system to another energy system?

Rotor (A) Signup and view all the answers

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

Provides a reversible means of energy flow in its magnetic field (A) Signup and view all the answers

According to Faraday's law, what can induce an electromotive force in a conductor?

A changing magnetic field (D) Signup and view all the answers

What type of DC motor has a permanent magnet on the inner periphery of the stator?

Permanent magnet DC motor (C) Signup and view all the answers

Which law describes the force experienced by a charged particle in the presence of electric and magnetic fields?

Lorentz law (C) Signup and view all the answers

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