Transformer Coils and Magnetic Circuits

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When a transformer's primary and secondary windings are wound in the same direction, what is the resulting phase shift?

90 degree phase shift

360 degree phase shift

No phase shift

180 degree phase shift (correct)

What is the purpose of the dot on a transformer's schematic diagram?

To indicate the coefficient of coupling

To indicate the primary winding

To indicate the input/output phase relationships (correct)

To indicate the secondary winding

If a transformer requires an opposite phase relationship, how can it be achieved?

By rewinding the primary coil

By swapping the terminals over (correct)

By increasing the voltage input

By changing the core material

What is the primary factor that determines a transformer's coefficient of coupling?

The portion of the total flux lines that cuts both primary and secondary windings Signup and view all the answers

What is the effect of changing the winding direction on a transformer's phase relationship?

It changes the phase relationship by 180 degrees Signup and view all the answers

What is the purpose of cutting the bar core in half to show the like-wound coils?

To visualize the like-wound coils Signup and view all the answers

What is the primary purpose of the core in a transformer?

To provide a path for the magnetic lines of flux Signup and view all the answers

What type of transformer is commonly used in power distribution systems?

Iron-core transformer Signup and view all the answers

What is the function of the primary coil in a transformer?

To receive energy from an AC source Signup and view all the answers

What determines the composition of a transformer core?

Voltage, current, and frequency Signup and view all the answers

What is the purpose of the secondary coil in a transformer?

To deliver energy to the load Signup and view all the answers

What is the main advantage of using iron-core transformers in power transmission?

They can handle high voltages and currents Signup and view all the answers

What is the primary goal of an efficient transformer core design?

To provide the best path for the most lines of flux with the least loss in magnetic and electrical energy Signup and view all the answers

What is the characteristic shape of the hollow-core transformer?

Hollow square Signup and view all the answers

What is the purpose of the transformer windings?

To connect the transformer to an AC power source and transmit power to a load device Signup and view all the answers

What is the most popular and efficient transformer core design?

Shell-core Signup and view all the answers

How are the laminations in a shell-core transformer constructed?

By butting together E and I shaped sections of metal Signup and view all the answers

What is the purpose of insulating the laminations in a transformer core?

To minimize energy loss Signup and view all the answers