Understanding Transformers

What are some common applications of transformers?

• Home heating systems

• Water purification

• Common applications of transformers include power distribution, audio equipment, and signal processing.

• Television broadcasting

How does transformer efficiency impact energy loss?

• Higher transformer efficiency leads to more energy loss.

• Higher transformer efficiency reduces energy loss.

• Transformer efficiency has no effect on energy loss.

• Lower transformer efficiency increases energy loss.

What are the main types of transformers used in electrical systems?

• Step-up, step-down, isolation, and autotransformers.

• Generators, inverters, and rectifiers.

• Capacitors, inductors, and resistors.

• Voltage regulators, circuit breakers, and fuses.

What is the purpose of a step-up transformer?

• To decrease voltage and increase current.

• To convert AC to DC power.

• To isolate electrical circuits without changing voltage.

• To increase voltage and decrease current.

How is transformer efficiency calculated?

• Efficiency (%) = (Output Power - Input Power) x 100

• Efficiency (%) = (Input Power + Output Power) x 100

• Efficiency (%) = (Input Power / Output Power) x 100

• Efficiency (%) = (Output Power / Input Power) x 100

What is the role of a transformer in power distribution?

• To increase the current for better efficiency.

• To store energy for later use.

• The role of a transformer in power distribution is to change voltage levels for efficient transmission and safe distribution.

• To convert AC to DC for distribution.

What are the differences between single-phase and three-phase transformers?

• Single-phase transformers are used for industrial applications; three-phase transformers are for residential use.

• Three-phase transformers require more maintenance than single-phase transformers.

• Single-phase transformers can handle larger loads than three-phase transformers.

• Single-phase transformers use one AC voltage source; three-phase transformers use three. Three-phase transformers are more efficient and suitable for larger loads.

What testing methods are commonly used for transformers?

• Insulation resistance testing, power factor testing, turns ratio testing, frequency response analysis, temperature rise testing.

• Harmonic distortion analysis

• Voltage drop testing

• Load flow analysis

How does load affect transformer efficiency?

• Load affects transformer efficiency by increasing copper losses at higher loads, while iron losses remain constant, leading to optimal efficiency at a specific load.

• Load has no effect on transformer efficiency.

• Transformer efficiency is highest at no load.

• Higher loads decrease copper losses significantly.

What is the significance of the turns ratio in a transformer?

• The turns ratio determines the type of materials used in the transformer.

• The turns ratio is irrelevant to the efficiency of the transformer.

• The turns ratio is significant as it determines voltage transformation and current levels in a transformer.

• The turns ratio only affects the physical size of the transformer.