Understanding Transformers

This video tutorial explains the function and construction of transformers, focusing on three-phase transformers. It begins with an overview of transformers' role in improving power transmission efficiency. The basic principle of electromagnetic induction is discussed, highlighting how varying magnetic flux induces electromotive force (EMF) in coils. The video then details the construction of three-phase transformers, including coil configurations and winding types. Finally, it covers the core construction, energy losses, and cooling methods used to maintain transformer efficiency.

What is the primary function of a transformer in power transmission?

• To store electrical energy

• To convert AC to DC

• To increase the frequency of power

• To change the voltage level of AC power

What principle explains the operation of a transformer?

• Ohm's Law

• Quantum mechanics

• Electromagnetic induction

• Thermodynamics

How is a fluctuating magnetic field produced in a transformer?

• By using a DC power source

• By heating the transformer

• By rotating the transformer

• By a coil and alternating EMF system

What is the relationship between the number of turns in the primary and secondary coils and the voltage in a transformer?

• More turns in the primary coil decrease voltage

• More turns in the secondary coil increase voltage

• Fewer turns in the primary coil increase voltage

• Fewer turns in the secondary coil increase voltage

What material is typically used for the core of a transformer to link magnetic flux?

• Aluminum

• Ferromagnetic material

• Copper

• Plastic

In a three-phase transformer, how are the low voltage windings typically connected?

• In a star configuration

• In a delta configuration

• In a parallel configuration

• In a series configuration

What configuration is used for high voltage windings in a three-phase transformer?

• Series configuration

• Parallel configuration

• Star configuration

• Delta configuration

What is the purpose of using thin steel laminations in the core of a transformer?

• To enhance thermal insulation

• To improve electrical conductivity

• To reduce energy loss due to eddy currents

• To increase the weight

What is the role of a conservator tank in a transformer?

• To store extra electrical energy

• To accommodate the expansion of cooling oil

• To reduce electromagnetic interference

• To increase the voltage output

What happens to the oil in a transformer as it absorbs heat?

• It evaporates

• It contracts

• It expands

• It solidifies