Transformer Basics

What is the main difference between an ideal and a practical transformer?

• Ideal transformer has more losses than a practical transformer

• Practical transformer has no losses, while ideal transformer incurs losses

• Ideal transformer has a higher efficiency than a practical transformer

• Ideal transformer has no losses, while practical transformer incurs losses

Explain the significance of the phasor diagram in transformers.

• Phasor diagrams are used to measure temperature in transformers.

• Phasor diagrams help determine the weight of transformers.

• Phasor diagrams in transformers are significant for visualizing the relationship between voltage, current, and phase difference.

• Phasor diagrams are only used in mechanical engineering.

What is the Per Unit System used for in transformer analysis?

• Calculating the efficiency of the transformer

• Determining the physical size of the transformer

• Normalization of values for easy comparison and calculation

• Converting between different unit systems

Describe the equivalent circuit of a transformer.

• The equivalent circuit of a transformer consists of a single capacitor

• The equivalent circuit of a transformer includes a battery and a resistor

• The equivalent circuit of a transformer includes an ideal transformer model along with parameters like resistance, leakage inductance, and magnetizing inductance.

• The equivalent circuit of a transformer is only composed of resistors

Why is testing important for transformers?

• Testing is important for transformers to ensure they meet performance standards, safety regulations, and quality control measures.

• Testing is important for transformers to ensure they are comfortable,

• Testing is important for transformers to ensure they are tasty,

• Testing is important for transformers to ensure they are colorful,

How is efficiency calculated in transformers?

• Efficiency = (Input Power / Output Power) * 100

• Efficiency = (Output Power - Input Power) * 100

• Efficiency = (Output Power + Input Power) * 100

• Efficiency = (Output Power / Input Power) * 100

Define voltage regulation in transformers.

• Voltage regulation is the efficiency of power transfer in transformers

• Voltage regulation in transformers is the percentage change in output voltage from no-load to full-load conditions, expressed as a percentage of the full-load voltage.

• Voltage regulation is the measure of current flow in transformers

• Voltage regulation is the ratio of primary to secondary voltage in transformers

What are some common applications of three-phase transformers?

• Residential heating systems

• Telecommunications equipment

• Power distribution, industrial applications, commercial buildings

• Agricultural machinery

What are the advantages of using auto transformers?

• Cost-effective, lighter, smaller, higher efficiency, lower losses

• Less reliable, more maintenance, less durable

• Higher cost, heavier, larger, lower efficiency, higher losses

• Limited voltage range, difficult to install, less flexibility

How do harmonics affect transformers?

• Harmonics reduce the risk of insulation breakdown in transformers

• Harmonics have no impact on transformers

• Harmonics can negatively impact transformers by causing increased heating, additional losses, reduced efficiency, insulation breakdown, and premature failure.

• Harmonics improve the efficiency of transformers