Transformers

The industrial use transformer that normally has 240 V or 480 V primary and a has either a 12 V, 24V, or 120 V secondary is called a(n) _____ transformer.

control

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

excitation

What function is performed by dielectric oil?

insulator, prevents moisture formation, provides cooling

An ____ transformer can have the same input and output voltages.

isolation

Most transformer cores are assembled from many thin sheets of metal. This type of construction is called _____ core.

laminated

In an open delta with single-phase loads, the high leg must be identified by using a(n) _____colored wire.

orange

The power input winding of a transformer is called the _____ winding.

primary

The output winding of a transformer is called the _____ winding.

secondary

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

step-up

When connecting three transformers for three-phase use with a delta secondary, a voltage test should be done before closing the secondary. The correct voltage reading is _____.

0 volts

What type of core is often found on high-voltage distribution transformers?

H-type

What is a magnetically operated device that can change values of voltage, current, and impedance without changing frequency?

transformer

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

turns

When using an open delta with a center tapped transformer, one wire is the high leg. The high leg is the one that has the highest _____.

voltage

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

toroid

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

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

step-down