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Generators and Power Distribution - Statistics
General Stats
- This quiz has been taken 8 times
- The average score is 14 of 46
Answer Stats
| Question | Answer | % Correct |
|---|---|---|
| What do generators transform mechanical kinetic energy into? | Electrical energy | 88%
|
| Is it possible to have an ideal transformer? | No | 63%
|
| What do transformers change? | Voltage | 63%
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| In that situation what would the graph of emf as a function of time look like? | A sine curve | 50%
|
| Massive power losses are experienced when what has a large magnitude? | Current | 50%
|
| How many output lines come out of the generator? | Four | 50%
|
| This is because of the equation P=__. | IV | 50%
|
| What are the names of the two coils in a transformer? | Primary | 50%
|
| Secondary | 50%
| |
| Therefore before transmission, what type of transformer is used? | Step-up | 50%
|
| Due to the priniciple of conservation of energy, when voltage is increased, what is the trade-off which decreases? | The current | 50%
|
| How many pairs of sets of coils are there in a typical power station generator? | Three | 50%
|
| What is the magnitude of voltage sent to houses for domestic consumption in Australia? | 240V | 38%
|
| What does a DC generator have the same components as? | A DC motor | 38%
|
| In simple generators, what do coils of wire rotate inside of? | A magnetic field | 38%
|
| Amplitude | 38%
| |
| What separates/unites the coils? | An iron core ring | 38%
|
| Along with an electrical generator, what is used in wind, steam and water power stations to generate electricity? | A turbine | 38%
|
| If the induced emf is doubled, what parts of the curve also double? | Frequency | 38%
|
| Pp=Ps (where P is power). Therefore Vp/Vs=_____ | Is/Ip | 38%
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| What does a DC generator use instead? | Split ring commutator | 38%
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| Due to its large mass, the coils in a power station generator are stationary, so what rotates? | The electromagnets | 38%
|
| In the Tesla/Westinghouse vs Thomas Edison feud, who supported DC systems? | Thomas Edison | 38%
|
| If the rotation is constant, what would a graph of the change in flux as a function of time look like? | A cosine curve | 25%
|
| An emf signal placed across a resistor would create an ___________ _______. | Alternating current (AC) | 25%
|
| Faraday's Law of induction states induced emf is equal to the change in magnetic flux over the ______ __ ____. | Change in time | 25%
|
| The magnetic field in the stator can be produced by what other than permanent magnets? | Electromagnets | 25%
|
| ^ is split into many layers separated by laminate, what does this prevent? | Large eddy currents | 25%
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| What changes as the coil rotates to produce a changing electromotive force in a generator? | Magnetic flux | 25%
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| In a DC generator, what switches sides when the emf's direction is reversed? | The brushes | 25%
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| What line acts as a continuous lightning conductor and prevents faults from altering the power grid? | The earth line | 25%
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| To show the danger of his competitor's system, what did Edison's company invent? | The electric chair | 25%
|
| If Vp is the voltage of the primary coil, s represents the secondary coil, and n represents the number of turns in the coil, what equation shows their relationship in an ideal transformer? | Vp/Vs=np/ns | 25%
|
| In Australia, pole transformers drop the voltage down to what value for industrial areas? | 415V | 13%
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| The deciding factor in the battle for power supply control was when what location was fought over for power supply? | Niagara Falls | 13%
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| In AC generators, what connects the rotor to the external terminals? | Slip rings | 13%
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| What is the last line known as? | The ground line | 13%
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| What dictates whether it is a step-up or step-down transformer? | The number of turns in the coils | 13%
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| Which company won the rights to the power plant? | Westinghouse | 13%
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| What supplies are transformers used in? | AC | 0%
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| Other than laminas, what materials what materials can be used to prevent large eddy currents in transformers? | Ferrites | 0%
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| In an equation, power loss, P(loss)=? | I^2R | 0%
|
| What type of transformer (not stepup or stepdown) is used in household appliances for recharging devices and rectifying currents from AC to DC. | Power-cube transformers | 0%
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| What type of insulators prevent dry air sparks in high voltage transmission lines? | Suspension Insulators | 0%
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| Where do transmission lines end and voltage is stepped down for distribution? | Terminal stations | 0%
|
| What is located in almost all regional centres for power distribution? | Zone substation | 0%
|
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