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AC Electrical Motors - Statistics
General Stats
- This quiz has been taken 129 times
- The average score is 4 of 16
Answer Stats
| Question | Answer | % Correct |
|---|---|---|
| What does AC stand for? | Alternating Current | 98%
|
| In a motor, what is electrical energy usually transformed into? | Rotational kinetic energy | 55%
|
| At what precise frequency is AC electricity produced at in Australia? | 50 Hz | 48%
|
| What type of material do the rotor and stator have at their cores? | A ferromagnetic material | 36%
|
| What is the most common shape of an AC motor's rotor? | A cylinder | 24%
|
| Thin steel laminations reduce the flow of what in this material? | Eddy currents | 23%
|
| This stationary magnetic field is cylindrical with three field coil pairs. What is rotating inside this cylinder? | An electromagnet | 20%
|
| In an induction motor, which magnetic field is stationary? | The stator | 20%
|
| An AC induction motor is similar to a transformer but there is an air gap between the stator and rotor and the secondary coil is allowed to do what? | Rotate | 19%
|
| In AC induction motors, how is the current formed? | A changing magnetic field induces the current | 17%
|
| What does the magnetic field from the stator produce on the coil from the rotor? | A torque | 16%
|
| What is the most common type of AC induction motor? | Squirrel-cage Induction motors | 13%
|
| In AC motors, what changes 100 times per second even though the motor rotates in the same direction constantly? | The direction of the current | 8%
|
| What is a common single-phase AC motor? | Universal motor | 7%
|
| What are motors that operate using two or three phases produced at a power generation plants called? | Polyphase motors | 2%
|
| For the current to be induced in the rotor bars, the rotor must ____ ______ the magnetic field. | Slip behind | 1%
|
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