18 Questions
What is the characteristic of a three-phase stator connected in a delta configuration?
Each line current is equal to 1.73 times the phase current.
What is the formula to calculate power consumed in a 3-Ø circuit?
P = √3 × V × I × Cosineθ
What is the purpose of the formula P ower (kV A) = ILine × VLine × 1.732 / 1000?
To calculate power in kilo volt-amps (kVA)
AC generators are typically power rated in:
Kilo volt-amps (kVA)
What is a characteristic of a three-phase stator connected in a wye configuration?
Line currents are equal to phase currents.
What is the formula to calculate power in kilowatts (kW) in a 3-Ø circuit?
P ower (kW) = ILine × VLine × 1.732 × pf / 1000
What is the power rating of the given AC generator in the WYE connection example?
69 kVA
What is the result of transposing phases B and C in a three-phase system?
The phase rotation becomes ACB
In a three-phase star connection, what is the relationship between the line voltage and phase voltage?
V line = √3 V phase
What is the advantage of a star connection over a delta connection?
It is more suited to balanced loads
What determines the output frequency of an alternator voltage?
The number of poles and the speed of rotation of the rotor
What is the primary advantage of three-phase connections in power transmission?
They are more suited to long-distance power transmissions
What is the advantage of a star connection in a three-phase alternator?
Single-phase voltage is available from neutral to each phase
What is the relationship between the voltage waveforms generated across each phase in a three-phase alternator?
They are phase-displaced 120° from each other
What is the total voltage across any two of the three line leads in a three-phase, Y-connected alternator?
The vector sum of the individual phase voltages
Why is it difficult to see what is happening in a three-phase stator schematic diagram?
The diagram is too complex, showing all the coils
What is the significance of the 1.73 factor in a three-phase, Y-connected alternator?
It is the ratio of the line voltage to the phase voltage
What is the advantage of a three-phase alternator over a single-phase alternator?
It can supply power to multiple loads
This quiz covers the basics of three-phase electrical systems, including stator diagrams and voltage waveforms. It's a fundamental concept in electrical engineering and is relevant for CASA Part 66 training.
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