Quiz 1.2

. [Recall] What does a phasor diagram represent in the context of transformers?

• The phase angle between primary and secondary currents
• The voltage and current waveforms
• The magnetic field distribution
• The power factor of the transformer

2. [Recall] Which of the following quantities are typically represented by phasors in a transformer circuit?

• Voltage and current
• Resistance and capacitance
• Frequency and power factor
• Temperature and humidity

3. [Recall] What type of diagram is a phasor diagram?

• A graphical representation
• A mathematical equation
• A schematic diagram
• A time-domain waveform

4. [Application] In a phasor diagram, how are the magnitudes and relative angles of voltage and current represented?

• Vector lengths and angles
• Waveform shapes
• Time-domain values
• Complex numbers

5. [Application] How can a phasor diagram be used to determine the power factor of a transformer?

• By measuring the phase angle between voltage and current
• By calculating the vector sum of voltage and current
• By analyzing the waveform symmetry
• By measuring the harmonics in the waveform

6. [Application] What information can be obtained from a phasor diagram in terms of transformer performance?

• Voltage regulation and efficiency
• Wire gauge and insulation type
• Transformer size and weight
• Magnetic flux density

7. [Analysis] How does the phasor diagram change when a transformer is under load?

• The length of the current phasor decreases
• The angle between voltage and current phasors changes
• The magnitudes of voltage and current phasors increase
• The frequency of the phasor diagram decreases

8. [Analysis] What can be inferred from a phasor diagram if the voltage and current phasors are not aligned?

• The presence of reactive power
• The transformer is operating at maximum efficiency
• The transformer is overloaded
• The presence of harmonics

9. [Analysis] How does the phasor diagram change when there is a phase shift between the primary and secondary voltages?

• The angle between the voltage phasors changes
• The length of the current phasor decreases
• The magnitudes of voltage and current phasors increase
• The frequency of the phasor diagram decreases

10. [Evaluation] How can a phasor diagram be used to determine the voltage regulation of a transformer?

• By comparing the magnitude of the primary and secondary voltages
• By measuring the power factor of the transformer
• By analyzing the waveform symmetry
• By calculating the vector sum of voltage and current