MODULE 6 IQ 5 Flashcards

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1
Q

What are generators

A

Device which converts mechanical energy into electrical energy by applying the principle of electromagnetic induction.

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2
Q

What type of commutator is in a AC generator

A

Slip-ring commutator

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3
Q

What is a slip-ring commutator

A

Two cylindrical metal conductors that rotate freely with the armature. They produce constant electrical contact between the rotating armature and external circuit.

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4
Q

What is an AC induction motor

A

Use AC current as opposed to DC current in DC motors

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5
Q

Rotor of AC induction motor

A

Assembly of parallel conductors and rigs, producing a shape similar to that of a ‘squirrel cage’

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6
Q

Stator of AC induction motor

A

Stationary electrical component, which is made of pairs of electromagnets, connected to an AC power supply

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7
Q

Coils of AC induction motor

A

Coils are wound around the electromagnets in such a way that when a current flows through the coils, one coil would be the North Pole and its pair a South Pole.

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8
Q

Operation of AC induction motors

A

One pair of electromagnets is fed AC current to produce a magnetic field, while the remaining two pairs do not. The pair is then turned off and adjacent pair is turned on, producing a rotating magnetic field.

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9
Q

Faraday’s law in AC induction motors

A

The rotating magnetic field induces an EMF and a current inside the squirrel cage rotor

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10
Q

Lenz’s law in AC induction motors

A

This induced magnetic field opposes the change that causes it, causing the rotor to spin in the same direction as the rotating magnetic field

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11
Q

Slip speed

A

Difference in rotational speed between the magnetic field and rotor

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