ADM 109 - UNIT 28

A transformer in which the secondary voltage is less than the primary voltage is called a(n) _____ transformer.

step-down

A transformer in which the secondary voltage is more than the primary voltage is called a(n) _____ transformer.

step-up

In a transformer, even when there is no load connected, there will be some small current flow known as _____ current.

excitation

A transformer in which the primary and secondary are physically separated and not connected by a conductor is called a(n) _____ transformer.

isolation

The transformer winding, which is the output winding, is called the _____ winding.

secondary

The _____ transformer is constructed in a similar manner to the core type, except that the shell type has a metal core piece through the middle of the window.

shell-type

A transformer has a 240 V primary and a 120 V secondary. With a 30 ohm load connected, what is the primary volt-amps?

480a

A tape-wound core is also called a(n) _____ core.

toroid

A transformer has a 240 V primary and a 60 V secondary. With a 5 ohm load connected, what is the primary current?

3 A

A transformer has a 2:1 turns ratio. 120 V is applied to the primary. What is the secondary voltage?

60v

In a transformer, the turns of primary wire compared to the turns of secondary wire is called the _____ ratio.

turns

The transformer winding, which is the power input winding, is called the _____ winding.

primary

A transformer that has one winding, which is used for both the primary and secondary, is called a(n) _____.

autotransformer

A tape-wound core is assembled by _____.

winding a long continuous tape into a spiral

The industrial use transformer that normally has 240 V or 480 V primary and a 120 V secondary is called a(n) _____ transformer.

control

The transformer that converts a high voltage from the power company down to 240/120 V for homes and businesses is called a(n) _____ transformer.

distribution

Any transformer flux that does not follow the core and escapes into the surrounding air is called _____.

flux leakage

The amount of current that flows into a transformer primary when voltage is first applied is called _____ current.

in rush

Most transformer cores are not made from a solid piece of metal. Instead, they are assembled from many thin sheets of metal. This type of construction is called _____.

laminating

A transformer supplying a house with 240/120 V has a secondary which is center tapped. The conductor connected to the center is called the _____ conductor.

neutral

The magnetically operated device that can change values of voltage, current, and impedance without changing frequency is the _____.

transformer