Transformer Efficiency and Design Quiz

What is the formula for transformer efficiency (η)?

• η = (Power output / Power input) × 100

• η = (Power losses / Power input) × 100

• η = (Power input / Power output) × 100

• η = (Power output - Power losses) / Power input

What causes the secondary voltage of a transformer to decrease as the load increases?

• Decrease in primary voltage

• Increase in insulation resistance

• Decrease in iron losses

• Increase in copper losses

Which type of transformer core has both windings on the center limb?

• Core type

• Shell type

• Air core

• Toroidal type

What is the purpose of lamination in an iron core?

• To reduce eddy current loss

• To enhance insulation

• To improve magnetic properties

• To increase eddy current loss

What type of transformer is designed to provide a current in its secondary that is proportional to the primary current?

• Voltage transformer

• Pulse transformer

• Current transformer

• Audio transformer

What is the main function of insulation in transformers?

• To enhance magnetic properties

• To prevent arcing between windings

• To increase efficiency

• To reduce copper losses

Which type of transformer is optimized for transmitting rectangular electrical pulses?

• Voltage transformer

• Audio transformer

• Pulse transformer

• Current transformer

What is the cooling medium used in oil-filled transformers?

• Air

• Water

• Transformer oil

• Nitrogen

What is the primary purpose of a polyphase transformer?

• To reduce eddy current loss

• To measure voltage

• To convert low voltage to high voltage

• To connect multiple phases together

What type of core is used in high-frequency transformers to eliminate hysteresis loss?

• Air core

• Iron core

• Steel core

• Laminated core