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PanGlobal Simple AC Generator Concepts Quiz

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Questions and Answers

What is the main function of the armature in an AC generator?

To produce a rotating magnetic field
To convert electrical energy into mechanical energy
To act as a commutator
To convert mechanical energy into electrical energy (correct)

How does the use of slip rings in an AC generator differ from the use of commutators in a DC generator?

Slip rings are used in AC generators, while commutators are used in DC generators (correct)
Slip rings are simpler and more reliable than commutators
Slip rings allow for a continuous flow of current, while commutators reverse the direction of current flow
Slip rings are used to collect the induced EMF, while commutators are used to distribute the current

What is the primary purpose of the electromagnet in an AC generator?

To convert mechanical energy into electrical energy
To produce a rotating magnetic field (correct)
To generate the induced EMF in the armature
To regulate the output voltage of the generator

How does the induced EMF in a motor differ from the induced EMF in a generator?

The induced EMF in a motor opposes the applied voltage, while the induced EMF in a generator aids the applied voltage (A) Signup and view all the answers

What is the relationship between the back EMF and the armature current in a DC motor?

As the back EMF increases, the armature current decreases (B) Signup and view all the answers

What is the purpose of dynamic braking in a DC motor?

To decrease the motor's speed (B) Signup and view all the answers

What is the primary mechanism by which a voltage is induced in the coil (armature) of a generator?

The coil cuts the lines of force of a magnetic field. (A) Signup and view all the answers

What is the purpose of the commutator and slip rings in a DC motor?

To transfer the current from the rotating armature to the external circuit. (D) Signup and view all the answers

What is the relationship between back-EMF and rotor speed in a DC motor?

Back-EMF is proportional to rotor speed. (A) Signup and view all the answers

What is the net armature EMF (ENET) in a DC motor?

The difference between the applied EMF and the back-EMF. (B) Signup and view all the answers

What is the purpose of an electromagnet in a DC generator?

To induce a voltage in the armature coil. (D) Signup and view all the answers

What is the direction of the force acting on a conductor carrying current in a magnetic field in a DC motor?

The force is always perpendicular to the current and the magnetic field. (D) Signup and view all the answers

What is the purpose of the slip rings in an AC generator?

To always connect one side of the coil to the same side of the external circuit (C) Signup and view all the answers

What is the relationship between the maximum flux, $\Phi_{max}$, and the induced EMF, $E$, in an AC generator?

$E = \Phi_{max} \omega \sin \omega t$ (B) Signup and view all the answers

What is the main component responsible for generating the magnetic field in a DC generator?

The field winding (C) Signup and view all the answers

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

To reverse the connections to the brushes every half cycle (C) Signup and view all the answers

What is the relationship between the change in magnetic flux, $\frac{d\Phi}{dt}$, and the induced EMF, $E$, in a generator?

$E = -\frac{d\Phi}{dt}$ (C) Signup and view all the answers

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